Cooling Question

Could be the wrong thermostat or the CTS

Thanks raz. But the thermo is new. Could there be air in the system ? I was told that it could cause this problem also.

I was gonna tell you that earlier but not too sure-do below and see what happens

BLEEDING COOLING SYSTEM

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.

Hey Ras, I bled the systym according to gm manual. Still does the same thing. I ordered a new t-stat should be here fri. I beleive the one in that came with the pump is a 195 0r 197 I ordered a 186. Also after a few drives being that is a pressurized system shouldnt that get rid of the air in it anyway?

Also after a few drives being that is a pressurized system shouldnt that get rid of the air in it anyway? It doesn't happen all the time-What I do when I change coolant-I run that water hose for 1/2hr till am satisfied and when I put coolant in it I just monitor the level everytime it drops I add a little till she cannot take no more than seal it and road test.

Sometimes when it has little hoses attached to the radiator or whatever to the cooling system you have to study the coolant passages whether its in or out they cause overheating too when clogged.

Its probably the Stat.