Car overheating help!
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Driver School Candidate
Joined: Feb 2018
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From: NY
Thread Starter
Driver School Candidate
Joined: Feb 2018
Posts: 44
Likes: 0
From: NY
Thread Starter
Driver School Candidate
Joined: Feb 2018
Posts: 44
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From: NY
to be honest I'm not sure. All I know is when my car reaches operating temperature after about 20 mins the fans will not turn on. Only will turn on when the AC is on. I had a shop set me up with a new radiator harness. Still have the same issue only problem now is when I do have the AC on the fans are constantly running now. I'm just so lost, and on top of that by that switch I'm leaking coolant. So now I have to see where that's coming from.
to be honest I'm not sure. All I know is when my car reaches operating temperature after about 20 mins the fans will not turn on. Only will turn on when the AC is on. I had a shop set me up with a new radiator harness. Still have the same issue only problem now is when I do have the AC on the fans are constantly running now. I'm just so lost, and on top of that by that switch I'm leaking coolant. So now I have to see where that's coming from.
Drive the car with no A/C on around your neighborhood see if the fans will kick on then. It has to get hot enough for the switch to activate a signal. Of course watch your overheating problem too.
Both fans should be on while A/C is on, and 1 cooling fan when not.
Thread Starter
Driver School Candidate
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From: NY
If it's leaking from above the sensor area. Most likely it's the plastic end has cracked. That's how mine went out except on the top for me. RockAuto.com has cheap Denso replacements.
Drive the car with no A/C on around your neighborhood see if the fans will kick on then. It has to get hot enough for the switch to activate a signal. Of course watch your overheating problem too.
Both fans should be on while A/C is on, and 1 cooling fan when not.
Drive the car with no A/C on around your neighborhood see if the fans will kick on then. It has to get hot enough for the switch to activate a signal. Of course watch your overheating problem too.
Both fans should be on while A/C is on, and 1 cooling fan when not.
yeah im just lost man. As I’m warming up the car at work both fans are constantly running now and won’t stop. This is the first time the fans go on without theAC on. In just so lost now
Last edited by Moorelow; Mar 1, 2018 at 03:40 PM.
If the fans are just running while car is started then it could be the fan switch. As for both fans working it should only be 1 fan. Then again I don't know if one is a hi/lo setup. Meaning it will kick on too if it dectects really high temps.
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Driver School Candidate
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From: NY
the fan switch isn’t located here on the bottom of the radiator where the drain plug is ? Where is the AC pressure switch located at ?
Here's the diagram. For some reason it's labeled as ECT switch too.
Last edited by MikeFig82; Mar 1, 2018 at 04:02 PM.
I forgot the GS400 has the sender for the temp gauge on the cluster. Its located near the thermostat by the left valve cover. So the GS3 should still have both. Seeing the diagram again. This one is signal for the ECU.
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Driver School Candidate
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okay yah that switch I know I actually disconnected and both fans stood on. And I have a 2000 GS300!
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yes! I located that, but idk now my fans are constantly running even if I just turn ithe key to ignition it automatically turns both fans on. And I tried pulling the coolant temp switch to disconnected and it broke Lolololol joy oh joy!
Last edited by Moorelow; Mar 1, 2018 at 04:26 PM.