Our 2002 Volvo V70 2.4T (P2) showed a Check Engine Light with Code P0128 on our cheap Autel/NAPA OBD2 unit: Coolant Temp. Below Thermostat. This happened on two chilly Colorado winter days after driving the car to 'normal operating temperature' and then turning the car off briefly with the radiator parked facing into a chilling breeze from the mountains. When I restarted the car 10-15 minutes later, the check engine light came on and I assumed that it was because the coolant in the radiator had cooled off much more quickly than the thermostat unit sitting on the engine head still holding residual heat.
However, after doing some internet research to code P0128, I realized that our V70's 'normal operating temperature' about a needle-plus width below midway on the gauge cluster was not normal for a P2 Volvo - they should normally operate right at the midpoint on the instrument temperature gauge.
In a subsequent conversation with Volvo Brett at Cars & Coffee, he mentioned the P2 Volvo's (5-cylinder white block) catastrophically overheat rapidly with a thermostat failure. With an upcoming road trip, I decided to change the thermostat for added piece of mind on my travels and see what was happening with the original thermostat after 235,000 miles.
This is a fairly straight forward remove / replace project with two critical items:
1) Accessing the two T40 bolts mounting the thermostat to the engine valve head - being certain to place the T40 driver squarely to prevent stripping the bolts in a difficult to reach area on the engine
2) Dealing with the power steering pump to provide the best direct square angle for the driver on the lower T40 bolt
After seeing the interior condition of the original Volvo thermostat, I am glad that I replaced the unit before a complete failure. With the new Volvo OEM thermostat installed, the V70 2.4T reaches the 'mid-point' normal operating temperature within a couple minutes of normal driving from a cold start - much improved from before.
I decided to change the coolant radiator hoses as well. I could not find any reference to the coolant hoses in the vehicle repair history and I have owned the Volvo V70 for 8 years (over 90,000 miles). I installed new blue silicone hoses from IPD on this project. I like the look of the new 'shiny blue bits' even though they are not an engine performance upgrade.
I now look forward to long-testing the new thermostat and coolant hoses on my upcoming road trip.
Car: 2002 Volvo V70 2.4T
Thumbnail: Hot Blooded
@jamiecars
Негізгі бет P0128 Code: Replacing Thermostat & Upgrading Coolant Hoses On The 2002 Volvo P2 V70 2.4T
Пікірлер: 5