Can A/C on cause OVERHEATING - Toyota Nation Forum : Toyota Car and Truck Forums


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3rd & 4th Generation (1992–1996 & 1997–2001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 03-23-2008, 02:52 AM   #1 (permalink)
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Can A/C on cause OVERHEATING

Guys...would like to find out more information regarding my car leaking coolant, it happen only when i turn on the A/C...would that indicate i need to replace the water pump ???

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Old 03-23-2008, 03:05 AM   #2 (permalink)
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No, sounds like your radiator fan is not functioning correctly. It should be on almost constantly when the AC is on and cycle on and off at a stop when it is not.
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Old 03-23-2008, 03:29 AM   #3 (permalink)
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How can i test it to see if it work properly ???

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Old 03-24-2008, 12:37 PM   #4 (permalink)
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Drive the car and get it up to operating temp (note where the temp gauge needle is). Pull into the driveway and open the hood. One fan should cycle on and off. Turn on the AC. The other fan should be on (continuously, I believe) and the other fan should still cycle on and off (though if it is cold out it may not cycle because the AC fan will keep the engine cold enough). During this test the temp gauge really shouldn't change much.

I find it hard to believe that the AC operating would cause coolant loss unless the car is overheating. Is it? Look over your coolant overflow reservoir. Is it cracked or broken? Is the hose between it and the radiator good?

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Old 03-24-2008, 01:43 PM   #5 (permalink)
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Running the AC with a non-working fan can cause the car to run hotter than normal, but by how much depends on the car.

My BMW 525i at one point had a non-working AC pusher fan, but being RWD, also had a mechanical clutch fan. If it was a hot day outside and I had the AC on, and I stopped moving (sitting in traffic), the AC would start to blow warm and the car would START to overheat, as in the temp started creeping up, but it would never go over 3/4. So no, the car wouldn't overheat to the point where I would boil coolant out, but yes, it would surpass the cooling capacity of the system.

Now, in a FWD car like the camry with only electrical fans, if they were not working at all, you could easily overheat the car to the point of boiling the coolant out.
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Old 03-24-2008, 08:31 PM   #6 (permalink)
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I got a 3VZ-FE engine, i believe it's power by just 1 fan.
Just came back from a pressure test, the mechaninc won't able to tell me where the leaking was because when putting on the pressure test....it won't lock in properly on my car...so not sure whether that is the problems causing to overheat ???

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Old 03-25-2008, 09:51 AM   #7 (permalink)
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So you're saying that the car does overheat? Please pop the hood and verify that there is only one fan.

Are you willing to work on the car yourself or do you plan to strictly go to a mechanic?

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Old 03-25-2008, 07:50 PM   #8 (permalink)
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Originally Posted by Kep View Post
So you're saying that the car does overheat? Please pop the hood and verify that there is only one fan.

Are you willing to work on the car yourself or do you plan to strictly go to a mechanic?

Kep
Yes it does...i see coolant leaking out a few times already.
Yes its confirmed it only had 1 Fan.
If its not too bad i might tackle it myself, else i don't have much choice but let the mechanic do it.

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Old 03-26-2008, 03:41 PM   #9 (permalink)
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OK, so where do you see coolant leaking from?

Does the fan come on when the car gets hot?

I am concerned that the mechanic couldn't get his radiator pressure tester to seal. Your radiator and cap seal up OK, right?

If the fan is running and the overflowing coolant is coming from the overflow hose I think I would just remove the thermostat and close it back up. Park the car on a steep incline with the front end high and run it a few minutes (to help purge any air). If it no longer overheats then it was your thermostat or an air blockage.

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Often, it's the loose screw between the steering wheel and the driver's seat that needs to be fixed first!

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Old 03-26-2008, 08:55 PM   #10 (permalink)
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Back from a mechanic again...this time he open up the radiator cap...and the cap look in very bad shape....so he told me to replace it and drive for a while and see what happen.

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Old 07-04-2008, 01:38 PM   #11 (permalink)
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Weid Sound on GEN 3 First Start!

Hi guys,

Need help with my car again!
Everytime when i press on the gas (engine still cold) i can feel my car making this funny sound and shacking at the same time as well, this only happen when the engine is completely cold, but once the engine is warm up the problems go away.

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Old 07-28-2008, 04:57 PM   #12 (permalink)
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93 Lexus ES300 Overheat when A/C is on

Ok so I have a question about my other car, 93 Lexus ES300 with 70K mi. I think this is same as 93 V6 Camry, but in anycase my car overheat when I drive a car with A/C on. However when I drive a car with A/C off, my car runs just fine and no overheating problem at all. I've red about possibly fan not operating but Is this a case with A/C switch been tuned on and off?
Is there anything that I can check somewhere? Waterpump, timing belt and thermostat is still original parts but again my car runs just fine with A/C off.
Any suggestion will be appliciated. Thanks.
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Old 07-28-2008, 06:29 PM   #13 (permalink)
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sounds like the fan in both cases

although the 3vz only has one fan, there is a pressure switch in the power steering pump (which drives the hydraulic fan) that increases pressure (with a signal from the ecu) when the coolant temp gets hot, and the same when the a/c is turned on.

basically, stand in front of the car and have somebody turn the a/c on from inside. you're best to do this when the engine is cold.

when the engine is cold, the hydraulic fan will just lazily spin and do nothing. but once the coolant temp turns on the fan, or in this case, the a/c does, it will spin noticeably faster. if it doesn't, then chances are that there is something a miss along that system
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Old 07-31-2008, 11:25 AM   #14 (permalink)
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Quote:
Originally Posted by Eye8Pussies View Post
sounds like the fan in both cases

although the 3vz only has one fan, there is a pressure switch in the power steering pump (which drives the hydraulic fan) that increases pressure (with a signal from the ecu) when the coolant temp gets hot, and the same when the a/c is turned on.

basically, stand in front of the car and have somebody turn the a/c on from inside. you're best to do this when the engine is cold.

when the engine is cold, the hydraulic fan will just lazily spin and do nothing. but once the coolant temp turns on the fan, or in this case, the a/c does, it will spin noticeably faster. if it doesn't, then chances are that there is something a miss along that system
I've tested hydraulic fan and it seems when my car is warm/hot, fan is turning faster however turning A/C switch on and off does not change fan speed at all. Also I've checked 93 ES300 manual and there are Coolant Tempreture sensor and Solenoid Valve that are directry connected with cooling fan ECU under glove box. Is this sensor a "pressure whitch" that you are talking about? Where is this solenoid valve located?
Thanks again for help.
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Old 07-31-2008, 05:33 PM   #15 (permalink)
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I don't know if the 1MZ is similar to the 3VZ or not. Below is a drawing of the 1MZ hydraulic fan system. It may help.



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Often, it's the loose screw between the steering wheel and the driver's seat that needs to be fixed first!

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