C70 Conv 1999 2.3l turbo 115K miles Engine "Overcooling"?

sjmosier · Post by **sjmosier** » 06 Jan 2010, 13:14

Hi guys I just joined your forum (awesome!) this is my first post... I did a quick look for this issue and did not see it so here goes - my lady has a 1999 C70 Convertible 2.4l turbo with approx 115K miles. Car has been well cared for. We recently moved from Denver, CO to Iowa and noticed that in the winter at outside air temps in the single digits to below zero the car doesn't come up to full operating temp (temp gauge not at 3 o'clock - more like 4-5 o'clock). I want to get a sanity check on my troubleshooting - I think it may be the thermostat or the coolant temp sensor. I have a sensor on hand but want to ask about thermostats. What is the OEM temp thermostat for this engine? Should I go with a different temp thermostat given the geographical location? If so, what temp do you recommend? Can I use a non-Volvo/aftermarket thermostat (like NAPA)? Is there a gasket or o-ring in this application?
I want to change and flush the anti-freeze when I do this and have read the threads on using Volvo anti-freeze so I will start shopping for that as well. Thanks!

Post by **OEMVolvoParts** » 12 Jan 2010, 09:10

Imo I would change the t-stat and the ect sensor at the same time. That should allow it to reach normal operating temperature. The factory t-stat is 194 degrees F.

You could use Napa stuff if you wanted. Try to price match, part number for the t-stat is 271664 and part number for the ect is 9125463. You need a small copper gasket for the ect, part number 11994.

hudi82 · Post by **hudi82** » 02 Feb 2010, 08:25

Hi,

I just had the same problem. It's been in the negative teens for the past few weeks in Chicago and my Californian Volvo had the same problem. I put some cardboard in front of the radiator and stuffed the vents in the bumper with paper. After that, the engine was reaching normal temperature, so I was certain that the thermostat was broken. I just replace the thermostat last Friday and now it runs like a charm.

I paid 150$ to get it replaced because I have no place to work on it indoors. It's a 40 min job and doesn't require specialized tools.