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Why my engine over heats only when the a/c has been on for about 30 minutes. Turn the a/c off and the temperture returns to normal within minutes.

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  • Cars & Trucks Master
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A/c systems generate heat around the radiator. But, the antifreeze in the radiator should be able to be cooled down by the fan even when the a/c is on.

I would flush and fill the radiator system installing 50/50 antifreeze/water solution.

How bad is the car overheating? Is it on a gauge that tells you how much it is over normal operating temperature?

Posted on Jul 08, 2010

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1 Answer

Temp. guage indicates overheat 10 mins. from startup


Hi Reggie, I'm glad to help. TWO things I want you to check. ONE: You have changed out a lot of stuff, so you may have air trapped in the cooling system, you'll need to remove the radiator cap and let it run until your at operating temperture, while watching to make sure it doesn't overheat on your of-course. If after running the engine say 30 minutes and topping off the coolant if needed, it still runs hot. Move on to: TWO: If you have the electric fan, some do, some don't. If it is electric make sure the fan is coming on, if it doesn't come on then you have found your problem, replace the fan assembly. Hope this helps and have an awesome day Reggie!

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What you describe is quite normal. While the engine is running and the coolant is circulating the thermostat maintains the engine within its operating temperature range. When the engine is switched off there is still considerable heat within the engine and the coolant will continue to absorb this heat. With no coolant circulation, the coolant inside the engine will register a temperature rise to the extent your gauge measures. This temperature rise may persist for up to 15 minutes until the natural thermo-syphon of the cooling system starts to dissipate this heat build up and the engine starts to cool down. Because the cooling system is pressurised, the coolant is prevented from boiling off at this temperature above boiling point. Once the engine is restarted the coolant flow is re-established taking this excess heat from the engine and the system temperature returns to normal.

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the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob

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