Question about 1994 Toyota Corolla

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My car overheat only when i turn on the ac

My car overheats only when i turn on the ac and it only runs fine for about 20 minutes and after that it starts to overheat but it only overheats when i stop. the fans work fine. what can it be? i already change the termostat.

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GET COOLING FANS CHECKED SOUNDS LIKE A DODGEY FAN OR FAN SWITCH

Posted on Jun 29, 2009

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Posted on Jan 02, 2017

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This isn't the hottest it gets. It goes all the way up to almost the red. It's over heating and we have changed the water pump,


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How can I tell if the engine cooling fan is functioning properly?


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I have a 2006 ford explorer. It overheats when I turn on AC! Without ac its fine and never overheats. There are no leaks, smoke.


Hi, dwings.
With your description, there are a few things that you can check.
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Also, check to make sure that the fans behind the radiator are working.
Lastly, you may have to take your car in to your local (and trusted!) car shop, and have them check your water pump to make sure that it's still functional.
Try these steps. If any of these solve your problem, great! If not, please come back and let us know and I or another expert will think up a few more solutions for you.
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My o1 grand am v6 overheats , just put in new t/stat and still overheats . how can i tell if the rad cap is bad


Where does water come out,if at all?It probably is a water pump since you already changed thermostat.Probably takes 15-20 minutes of good running speed to overheat?Greg

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Hello donezero,

Thank you for choosing fixya.com.

Try replacing the thermostat first. I see you mentioned that it overheats with the A/C on, while in neiborhood streets (or lower speeds). Also, with the vehicle parked, and the car running, raise the hood, and watch to see if the fans are coming on. If not, check the fuses in the fuse box. You may have a blown fuse. Examine both top and bottom radiator hoses to make sure there are no cracks, holes, or bubbles. If they look like they need replaced, replace them. Also, check the fuse and any relays that may be associated to the A/C pump - there should be one of each. By changing the thermostat, you eliminating it right away for being the reason of overheating. After diong all this, and the car still overheats under these circumstances, replace the temperature sensor, which is located on the intake manifol (usually close by the thermostat ) driver side of engine, toward front or center. (may be on passenger side, depending on engine). If this does not take care of the problem, consider a certified mechanic for further assistance.

I sincerely hope this information is helpful in getting your car (A/C) running properly. Let me know if I can be of further assistance in this matter. Thank you again for choosing fixya.com.

carsandcomps
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I just had my coolant flushed and my radiator cooling fan replaced. The car was slightly overheating and would "gargle" in the coolant bowl after I turned the engine off. It turned out to be the radiator was clogged up on one side.

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