How to fix overheating with new thermostat installed.

TJTAMPA2000

MEMBER
1989 CHEVROLET CELEBRITY
155 MILES

2 Different mechanics realized (1) car will not stay running when idle is placed at "normal" level; must keep it running slightly higher than normal. And (2) each cannot figure out why, but car immediately overheats when a thermostat is installed. No sign of blown head. But living in GA now, I need a heater and of course I need car to not overheat. Any advice on how to resolve this issue? Car will put out some heat (not hot enough) but it will not "blow" and mechanice says he will investigate if something is blocking the flow.

Sunday, October 9th, 2011 AT 5:00 PM

1 Reply

RIVERMIKERAT

MECHANIC
6,110 POSTS

Flow blockage is a good place to start. What sort of time frame are you considering "immediately"? Does coolant boil and froth from the filler neck within a couple of minutes of starting?

Have the mechanic use the chemical that detects the presence of combustion gases in coolant.

Make sure the heater hoses are properly connected. Test the thermostat with a pan of boiling water and a high accuracy liquid thermometer.

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Sunday, October 9th, 2011 AT 6:38 PM