Hi,
I have a new to me 2001 xc70 with 100k miles on it. The car is really nice and everything seems ok except for the heat. It seems fine at idle heating up to the second or third notch on the gauge, but, traveling down the road it runs cooler and cooler the faster you go. The seems to be a direct corelation between temp on the gauge and heat inside the cabin. The air from the ducts never gets more than lukewarm.
This suggests to me that the car needs a thermostat, but, I am not familular with Volvos so I wanted to check here first
Anything I should look for?
Thank you in advance

Ed

 

Sounds like your stat is stuck. They are inexpensive and easy to change, I just changed mine because of a coolant temp code on my OBDII scanner.