thermostat

My 98 Sonoma temp skyrockets in crawling traffic But as soon as i get going temp goes right back to the normal spot between 100 and 210. Thermostat? Heat is fine. 2.2l if it matters.

I have a 97 GMC Savanna, recently replaced the heat control valve and thermostat. The engine will not get to temperature. Before I replaced the thermostat, the gauge registered around 100, then afterwards it goes to somewhere between the 100 and hovering around the big line at I guess about...

Hello. I just bought a 1996 GMC Jimmy with a few issues. Since I'm not rolling in cash I'm hoping to manage some of the repairs myself. First out of the gate is the temperature problem that I didn't notice a couple days ago. The Jimmy starts smoothly and there are no strange noises coming...