Cooling Question

HDCRUZER

MEMBER
CHEVROLET CORVETTE

I just had my waterpump replaced with a genuine gm water pump in my 97 Corvette. It appears to have been replaced with the 2004 version going buy the shape of the thermostat housing. On the freeway temp will start out at 198 works it way up to 208-210 work its way back to 198 stay at 198 for awhile and work its way back to 208-210 and so on. Before the new pump was put on, it would run at a steady 189 to 196 and stay there. What could cause this?

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Could be the wrong thermostat or the CTS

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Sunday, October 28th, 2007 AT 12:03 AM

HDCRUZER

MEMBER
3 POSTS

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

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Sunday, October 28th, 2007 AT 10:11 AM

RASMATAZ

MECHANIC
75,992 POSTS

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.

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Sunday, October 28th, 2007 AT 6:32 PM

HDCRUZER

MEMBER
3 POSTS

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?

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Sunday, October 28th, 2007 AT 9:52 PM

RASMATAZ

MECHANIC
75,992 POSTS

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.