Volvo 850 » Thermostats & Seals

If you find this place/part leaking, then open up the thermostat housing and inspect the blardy thermostat. I changed my thermostat EVERY year, and yet the dang thing could fail me in the 8th year. THe total costs was horrendous, as overheating caused a lot of other things to burn/damage as well... In anycase, if you buy the thermostat (any kind), chances are that you'll get this ring seal together. But if your thermostat housing is leaking, then open the housing, you may need a T40 bit for that (or whatever is you've changed into aftermarket bolts), and inspect the seal. If the seal was improperly placed the first time, it may have crushed the walls and you need new seals for that.

Hope that helps.
Cheers, all the way from Malaysia!

I decided to install this part when I did my timing belt assembly. The old thermo was completely shot. I looked like someone hit it with a hammer and then lit it on fire. Now that I know where this part is I can change it in 5min without draining the coolant.

Thanks IPD, Spencer

Just replaced the thermostat and coolant temp sensor on my '98 XC. I recommend doing both at the same time. Get a torx T40 screwdriver style to remove the inside bolt as anything larger will be very hard to get in behind the fuel rail plumbing. This took care of the code # 116. Bad coolant temp sensor. Quality parts from IPD and less expensive than most suppliers.