now that our daily temps are in the teens my 2004 gmc 1500 sierra with the small v8 won't maintain normal operation temp of 200 degrees. It will reach
200 going up hills or running on the interstate but immediately starts to cool down when coasting downhill or driving around town. I got the dealer to install a second new thermostat yesterday but if anything that just made it harder to warm up, I drove around town for 1 1/2 hours last evening at about 170 degrees. Now I know that ain't right and i think it effects my gas mileage too. So what should I do?- posted
18 years ago