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Go Back   3800Pro.com Forum > Engine > Cooling System

Cooling System Discussions regarding radiators, water pumps, T-stats, hoses, etc...

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Old 05-24-2019, 04:50 PM
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06 grand prix overheating....

I had replaced the thermostat, water pump, flushed system, changed out the plastic elbows. Now I find fans wont kick on. The low speed kicks on with the ac. And when the coolant sensor is unplugged they both run full blast. Where too look next?
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Old 05-25-2019, 01:20 AM
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Check these numbers and see if your fans come on(oem info)....

The computer commands LOW SPEED FANS on at 212 degrees.

The computer turns on high speed fans at 221 degrees. This is INFO IS FROM THE ALLDATA WEB TECH SITE.

Check your temps with these to see if they are close.

On another nots, you should loosen up the radiator mounting brackets that secure the radiator and then spray a healthy amount of water thru the core to remove all the road and plant debris that gets stuck into the front side of the radiator core. See this many times and various cars and trucks. This causes poor air flow for cooling the radiator.... It would be a good idea to take a close look inside the radiator tank to see if it's DIRTY.....this will also cause over heating..... You can also put a lower temp thermostat in.... say 160 to 180.. I would run the lower one. In my personal hot rod GTP, I don't run a thermostat and engine temps get to 160/170 better for performance but too cold in winter months (for the passengers). The side effect of running colder engine temps is poor heating. Also, with no thermostat, one would need to take a min or so of engine heating up...before driving. Positive effects are.....better performance. Jake...MR Goodwrench Other thing that might be part of you cooling issue is the cooling fan relays.... If I remember, there are three relays usually mounted near the radiator.....

Last edited by mr goodwrench; 05-25-2019 at 01:26 AM. Reason: more info
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