Hi,

I've noticed that the cooling system is struggling in my 98 Z28, not into overheating state yet, but getting close. There is no leakage anywhere....and it appears the water pump is working okay...so I'm wondering if there is a problem with the thermostat. Strangely, two winters ago, I could not get enough heat into the vehicle, the temp gauge on cold winter days would barely get into the warm unless sitting idle for several minutes with no cool air rolling thru the rad. Now the opposite. Could the 'stat be sticking in one position?? Looking for some insight here if anyone can help...great. Thanks so much.

 

It's in a housing on the passenger side front of the engine, just follow the radiator hose