Hi Adam, I have been working with Jaguar Classics for many years now and have heard overheating stories from everybody BUT after 200000 miles with my own 5 Jags (Model year 1964/1973/1983/2001/2004) I only had one stuck thermostat. Now there is one major point that you forgot and it is one long time problem ...... voltage regulators ..... they get old and inefficient or where never that good in the first place. For example on my V12 E-Type the regulator should put out a constant 10Volts but if that output slowly increases over the years two of your gauges are effected: water temp and gas tank quantitiy, they both start to show higher and higher. Now the battery has 12.6 Volt but when the alternator kicks in the system might go as high as 14.8 Volts and if the regulator cannot maintain the 10Volt output, those indications will be proportionally wrong. Checking them could be an 18 Dollar fix for an „overheating“ system. The reason why those 2 gauges are effected ist that they measure voltage between a fixed resistance resistor and a variable NTC (negative temp coefficient) resistor. So if the Voltage input is a constant 10Volts and the NTC (Temp sensor) resistance changes, then the Voltage measured between the 2 „indicates“ the Temperatur change but if the input Voltage fluctuates you measure system voltage changes indicated on those 2 gauges. Have a nice day and stay away from aftermarket parts, Bernhard
@iamthebroker
3 жыл бұрын
Thanks Bernard. I’ve just bought a series 3 Xj. This is great to know. Thanks mate.
@chrismaley895
4 жыл бұрын
Adam, I've been fooling about with Jaguars for over 4o years, and I have always sweated the cooling system (pardon the pun). At this point in my life I just replaced everything: radiator, thermostats, hoses, belts etc. This what I call an ignorant paranoid persons' approach. I did not know about the V'12 temp difference on each side! Yes! Yes indeed I would like to see a part 2...especially about the XJS V-12. Another great video, Adam. Bravo! Chris/Colorado Springs/USA
@LivingWithAClassic
4 жыл бұрын
The cooling system is the first thing I check when getting another Jaguar. Part 2 coming up. Thanks for watching!
@ianjackson7205
4 жыл бұрын
Adam, please follow up with part 2. I've been restoring a XJS V12 1990, got the engine bay dismantled and would love to hear your details you've discovered. The XJS has that "history" of overheating or burning up, hasn't happened to my other two XJS. Nice to hear someone else say the original design still is capable . Enjoy your videos.
@LivingWithAClassic
4 жыл бұрын
Part 2 coming up. Thanks for watching! 😊
@paulb1034
3 жыл бұрын
Thanks for the videos, very informative and enjoyable to watch. As a Series 3 Roadster owner I can add that the effectiveness of the radiator is also based on the flow rate of the water through it and not just the temp drop across it. The 40 degree drop you have suggests a lack of water flow through the rad, if thermostats/pump are OK then the next thing to do is remove the rad and have it flow tested. A large pressure drop across it points to corrosion inside but easily fixed with a new core.
@V12motorsports
4 жыл бұрын
Thanks Adam. I would love to see a part 2 of this video. My V-12 XJ-S is running in between N and H but won't overheat
@LivingWithAClassic
4 жыл бұрын
Thanks for watching! There will be a part 2 😊
@sofakingj5498
3 жыл бұрын
Hey there, I have a V12, XJS as well 1990, and it gauges goes above normal, what do you recommend to do ?
@V12motorsports
3 жыл бұрын
@@sofakingj5498 did you flush the system, Check the thermostats,Ever take a look at the coolant temperature sensor, bleed the coolant system?
@sofakingj5498
3 жыл бұрын
@@V12motorsports no I have not, I just bought the car, i don't know much about jaguars, that's why I am asking people with xjs on what should i do.
@johncooper6950
4 ай бұрын
Hi Adma - this was very useful and I very much appreciate your video, comments and overall approach.
@tonycollingridge4347
4 жыл бұрын
Good video Adam. My old Mark 2 is always a worry from this point of view but I've slowly and surely got to understand that things I need to do to keep her as cool as I can. Result was driving halfway across England last year on the day that the record high temperature was broken. Yes, she ran very hot but didn't overheat - the only thing that did was me!!
@boyfromblackstuff7859
Жыл бұрын
This was both interesting and informative, thanks for posting.
@isntax
4 жыл бұрын
Yes, please do a part 2! Very informative
@santiagorecasensros3244
4 жыл бұрын
Very good video and very good point! In my recently purchased XJS straight six, we cleaned the radiator and the entire coolant circuit, replaced thermostat and changed all the rubber hoses (they were not bad, but they were 25 years old). The coolant system works like new, but the temp gauge marks a little above N. My mechanic (specialized in classic Jags and knows XJS's like the back of his hand) told me that the operational temp in any car is about 90 degrees C, and that is VERY close to boiling. If temp gauges showed REAL temperature, the needle should be always very close to the red mark, but that would get most drivers very nervous. So modern temp gauges are kind of designed on purpose to be stuck in the middle even though that is not showing the real temperature at all. In my case, my temp gauge marks a little above N but I know for sure that my cooling system is working perfectly.
@matteustace9507
4 жыл бұрын
One quick point on the XJS - the thermostats are not open/close, they are diverters between the bypass link or the radiator. The water in that bypass tube or back from the radiator is then split between the two banks. So differences in thermostat opening should not affect bank temperature as the water the banks receive from the water pump is the same temperature on both sides.
@bernhardlist9359
4 жыл бұрын
Oh, another interesting thing that I came across. I took my recently aquired V12 E-Type apart because I felt that power output was not that great and there was a clicking noise (changing with RPM) that I blamed on Valve play but when measured they all where to tight. So I opened it up and found that 4 of the 12 pistons had broken pistonrings. Lucky me, no damage was done to the engine (just low performance). Now to the interesting part: inside the waterway I found 11! thumbsize neoprene pieces and more than 3 cups of sand being flushed around mostly in the rear part of the engine and the cylinderblockwalls where thick covered with some slush. Now this is a major handicap for a „still normal“ functioning cooling system. Engine temperature was still fine without any overheating tendency. That alone tells me that the cooling system was not nearly as bad as it’s reputation. I could never find out where the neopren pieces came from but the sand was left over casting sand from the factory from sloppy cleaning when new. Nigel, a long time Jaguar specialist from England told me that something like that was not uncommon. Waterpump sho wed no damage! What I did notice the day I bought the car was, that on the way home from Munich (Germany) that everytime when I stopped at a gas station, cooling liquid was „peeing“ onto the floor. The cause was a wrong pressure cap on the radiator which released pressure build-up too early. A Jaguar Radiator cap with the correct pressure rating fixed that. On the E-Type the fans (2) will not come on when the ignition switch is in the OFF position while newer Jaguars (my XKR) will come on with power from the Hot Battery bus, and so some heat buildup when stopping is normal. I do avoid „Aftermarket parts“ like the plague, because, without exeption, all such „Chinese parts“ previously purchased malfunctioned within 2 weeks. Good quality Radiator caps, Thermostats, Coolant temp sensors and clean electrical contacts are, even with OEM parts a cheap insurance against heat problems. So most problems are „selfmade“ by saving a buck on good parts. Greetings Bernhard
@chargerification
28 күн бұрын
Well written and informative. Greetings from USA
@bernhardlist9359
27 күн бұрын
@@chargerification One more source of seemingly „overheating“ is a little gadget, the Voltage Stabilizer. I have seen this multiple times. With age they start dying and the car seems to run hotter. Very easy to locate and the first thing to check when the car seems to overheat. The Voltage stabilizer sitting behind on the instrument panel, left side top edge. It is supposed to maintain 10Volt at all times since the Coolant Temp and Fuel Tank gauges are comparative instruments and they need a constant base voltage (10Volts) to compare it to. Testing: measure the ingoing voltage e.g. 12.8 Volts and than the outgoing voltage, MUST be around 10V. If the outgoing Voltage is different ….. the instruments will show WRONG. e.g. OVERHEATING and a fuller tank. Have fun solving the problem.
@petehalasz7547
10 ай бұрын
Good video Adam.. I have been using two high end temp guns for more than 10 years... I've been teaching my students for years that a temp gun can find, bad injectors, bad coils, Lean or rich conditions.... also as another viewer mentioned low alternator output will make you chase your tail for weeks, and become a parts cannon.. Like you mentioned, the temp gun is a preliminary diag,, a volt meter on each sensor would be your next verification.. Keep up the good work.. and may the tool gods be with you....
@LivingWithAClassic
10 ай бұрын
Thanks!
@santiagorecasensros3127
4 жыл бұрын
Excellent video. As you know, I recently bought a 1995 XJS straight six, and one of my priorities was to keep the cooling circuit in pristine condition. We cleaned the radiator (inside and out), replaced thermostat and put brand new hoses (the original ones were ok, but were 25 years old). I was concerned because the temp gauge was a little to the right of the N, and sometimes between N and red zone but my mechanic told me not to worry. Unlike modern gauges that always point at the middle on purpose, these old temp gauges actually DO show the real temperature. And most people don"t know that the best operating temp for a gasoline engine is pretty close to boiling (around 90 degrees celsius). But even knowing that, I must admit that I still feel uneasy when I see the gauge beyond N, despite knowing that the cooling system is perfectly fine.
@LivingWithAClassic
4 жыл бұрын
The best thing is to check what the temperature really is with an IR thermometer like in the video. Then you will know if it is too hot or not. Hope you can enjoy your nice XJS!
@stigmoltu-jacobsen
4 жыл бұрын
Thanks Adam! I’d like to see video 2 as well.
@LivingWithAClassic
4 жыл бұрын
Part 2 coming shortly 😊
@charlesopang8793
4 жыл бұрын
Absolute right. I've been living with my Series 2 for many years now. You've to know and 'feel' the temp gauge. Mine has been good, as accurately expressed by Adam.
@LivingWithAClassic
4 жыл бұрын
It's good to get to know your car. Thanks for watching!
@jeffharrison5265
4 жыл бұрын
Yes, a part 2 would be great, particularly for the xj6. Great video.
@philtoft3863
4 жыл бұрын
Great info. Unreal, I commented on the S type video earlier about cooling and you post this. Class. I would love a part two of more detail! I've a pre He v12 and I'd love to know the correct way to get air out of the system and other things. Thanks a million Adam.
@paulfitzgerald7513
4 жыл бұрын
El Tofto look at your slam panel on top of the radiator (on the B bank side) and you should have a small bleed valve that looks like a tap. If you haven’t got one I’d suggest getting one as it’s the easiest way to bleed the pre HE’s.
@philtoft3863
4 жыл бұрын
@@paulfitzgerald7513 I have a winged bleed valve. I've parked on a hill nose pointin up. opened it and left the car running and it never seems to boil/let out steam or burp or what have you. Am I being completely stupid and missing a part of the process? Any advice would be welcome! Thanks Paul.
@paulfitzgerald7513
4 жыл бұрын
El Tofto Next thing to try is to look on the top of the slam panel again but on the A bank side. You should see a banjo bolt connected to the pipe work that runs to the B bank. That banjo bolt can get clogged as well as the pipe running across the slam panel. Let me know how you get on.
@philtoft3863
4 жыл бұрын
@@paulfitzgerald7513 okay, Ill check and do all that as soon as this storm outside blows over. Just to confirm tho while running the car, I leave the cap off the expansion tank, loosen the bleed valve and that bango bolt. Once all the air is expelled, and water spews out, tighten everything up and I'm done? Cheers man.
@philtoft3863
4 жыл бұрын
@@paulfitzgerald7513 your a star. Thanks for all ya help and tips. It's all sorted now. Delighted.
@horizoninabucket
4 жыл бұрын
Highly recommend installing filters in both the top hoses in the V12. To stop the top 1/3 of the radiator blocking up with crud and causing invisible left bank overheating.
@bespokeaddict
4 жыл бұрын
Fantastic my friend, I lost a V12 on left bank, I bought new thermostats & broke bolts on housing, the left failed before I had it drilled out, I think I drove for sometime on overheating bank without realising. I will buy thermometer
@LivingWithAClassic
4 жыл бұрын
Those bolts are tricky on the V12. Thanks for watching!
@billwatson7412
4 жыл бұрын
Great stuff! Yes, please part 2.
@LivingWithAClassic
4 жыл бұрын
Part 2 coming up
@adampritchard1117
4 жыл бұрын
Would love to see part two thanks Adam.
@LivingWithAClassic
4 жыл бұрын
Part 2 coming up soon. Thanks for watching 😊
@wilburnbratcher3467
3 жыл бұрын
Good video, Adam. Thank you. I would like more on trouble shooting overheating problems for XJS S12. I have a 1990 model having overheating problem.
@LivingWithAClassic
3 жыл бұрын
Sure I can do another video on various overheating issues
@Clarkecars
4 жыл бұрын
One thing that is frequently overlooked due to ignorance particularly on the V12 engines is the absolute need for thermostats that have a "jiggle pin" to bleed off air in the cooling system.
@LivingWithAClassic
4 жыл бұрын
Yes that is very true! They need them to let any air bubbles out
@titusandronicus4826
4 жыл бұрын
I've checked that now on my XJ 6. Outside Temp was 25 degrees celsius, long drive in the sun, last miles in the city. Gauge is most times straight in the "m" from "normal", sometimes shortly touching the "a". Outgoing temp was 99 degrees celsius, comes out with 62 degrees. I guess that's OK, what do you think? Great tip to get familiarized with a new car - thanks a lot!
@titusandronicus4826
4 жыл бұрын
Oh, I guess, it's important to measure with the right adjusted emission grade! The cheaper instruments measure with 0.95. I measured with a Bosch PTD 1 and 0.85 which is recommended for metal.. So I have to repeat the measuring to get comparable. I'll keep you updated.
@LivingWithAClassic
4 жыл бұрын
I think that's ok on such a hot day. Thanks for watching and thank you for becoming a Patreon!
@titusandronicus4826
4 жыл бұрын
I checked again today with emission grade 0.95, same round. I got 93 degrees out and 61 degrees in. That's even better. And I can only recomend to everyone to become a patron on your channel! :-)
@thorstenhntgs9810
4 жыл бұрын
great video again. I have XJ6 and a XJS V12 so this is really an issue for me. Please post a second more detailed video on the temperature details. Greetings from Germany. Tobias
@LivingWithAClassic
4 жыл бұрын
I will post a part 2. Thank you for watching!
@williamendres1265
4 жыл бұрын
If you take a temperature reading off the radiator hose isn't that going to be somewhat lower than actual due to the insulating properties of the rubber hose? In contrast taking the temperature off the metal thermostat housing is probably pretty close to actual coolant temperature.
@tomaszkomorowski2500
4 жыл бұрын
HEy Adam, great video. PArt 2 - good idea. Specially xj6 :)
@LivingWithAClassic
4 жыл бұрын
Part 2 coming up. Thanks for watching! 😊
@AlexTrain5249
4 жыл бұрын
The '78 I was looking at was sold but miraculously it came up for sale again and that person gave a more detailed description about what was wrong. It starts and runs for a second but then it dies again. I'm guessing it's either faulty injectors or fuel pump. Or it could be a spark plug lead.
@bernhardlist9359
4 жыл бұрын
Hi Alex, I normally don’t like diagnostics over the internet but if you assume that it could be the pump then just go ahead and measure fuel pressure. It should be (check the manual) in the area of 40psi now squeeze the returnline upstream from the regulator (your car might have 2) and pressure should rise to 70-80psi than the pump is good. If the pressure is low but rises when squeezed off before the regulator than the regulator maybe bad. Next, if you smell some fuel unplug the little vacuum hose on the regulator ..... if fuel comes out, the diaphragm in the regulator is bad and drowning the car with fuel. Replace the regulator. If you suspect an injector, take a long screwdriver and touch the injector and feel the clicking noise. If you have access to an oszilloscope you can easily test injectors but in that case contact me via email and I send you information how to hook-up the wires and send you some good and bad scan pictures: bernhardlist@hotmail.com Greetings Bernhard
@cosgraham534
4 жыл бұрын
Good one Adam. I can’t get consensus on what a safe operating temp is on a S3 XJ12. Mine stays around 95 deg in traffic on a warm day - my mechanic suggests the radiator might be partially blocked. Any info you can give would be great - thanks.
@jagroopsingh12359
3 жыл бұрын
Hey mate, i have got xjs 1978 v12 and i have problem with my car on the right hand intake manifold pipe blocked with a plug if im pulling that out car runs funny seems like sucking air from somewhere if I block that side again,it runs fine but not that much power what you recommend Should i do ?
@bespokeaddict
4 жыл бұрын
Please do another more detailed second video 👏👏👏
@LivingWithAClassic
4 жыл бұрын
I will 😊
@r2r324r431r4r4
4 жыл бұрын
Damn, I have the same exact car. 90'xjs v12 and my temputure gauge is always showing right above the N. What is the first thing I should check to see why it's running so hot?
@espenkristianhegdal9998
4 жыл бұрын
My V12 has a overheating issue so I would like to see how you would attack it.
@LivingWithAClassic
4 жыл бұрын
I think that calls for a part 2
@earldominguez3938
2 жыл бұрын
Which one is the xjs
@yashswamy8394
4 жыл бұрын
Can you plz make a video about the center console wiring in the xj6 cause I removed the console for Upoltery and now forgot where all the wires go, plzzz could you help
@kevinmurphy4304
4 жыл бұрын
Do any of your cars run with waterless coolant ?
@LivingWithAClassic
4 жыл бұрын
I don't run it but a friend of mine does in his XJ6 series 1 and he really likes it
@leroyducksworthjr.4470
4 жыл бұрын
Is it good or bad to put fail safe themothats in a xjs v12
@LivingWithAClassic
4 жыл бұрын
I have never tried them. I have always used Jaguar original ones and they have worked well.
@leroyducksworthjr.4470
4 жыл бұрын
@@LivingWithAClassic thanks🙏
@lieberfreialsgleich
4 жыл бұрын
If this engine gets hot, it might be because you use these airfilters. The engine cannot get cold air.
@LivingWithAClassic
4 жыл бұрын
It's been running fine with them for over 15 years
@larryebeling6853
Жыл бұрын
Hi I have a 93 xj6 six Cy the gages say it's overheating but the temperature gun says 160 or so I replaced the sending unit and the gage still runs hot
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