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Old 04-19-2019, 04:43 PM   #1
SIRPAULGERMAN
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Default Overheating again

Well it happened again my 2001 SL1 overheated on my way to work

I am pretty sure that the cooling fan did not kick in
It has a new thermostat, however the gauge goes all to the 1/2 mark, I think is still too hot.

How do I check the cooling fan ?
What if I take the thermostat out ? or what brand is a cooler thermostat ?
How do i check for the water pump to be in working condition ?

I made it to work with the heat to the max and helped a lot, the temperature the gauge went to the normal position. I was stock in traffic for 1/2 hour, stop and go all the time, maybe 5 miles per hour

thanks for your time

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Old 04-19-2019, 05:08 PM   #2
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Default Re: Overheating again

Overheating how?

Coolant boiling out of the surge tank?
High gauge reading into the red?

If you have AC that works does the cooling fan come on when the AC is turned on?

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Old 04-19-2019, 05:12 PM   #3
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Default Re: Overheating again

I forgot to mention gauge all over the red mark, the hot temperature signal came on.

The Ac seems to be working fine, before the car overheated.
Does the cooling fan engage when the ac is on ?
I did not see any leaks from the surge tank

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Old 04-19-2019, 06:05 PM   #4
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Default Re: Overheating again

Correct, as SSICARMAN said, the radiator cooling fan should turn on whenever you depress the AC button to turn the AC on.

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Old 04-19-2019, 06:16 PM   #5
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Default Re: Overheating again

Is it possible that the fan turn on during ac, but not when the engine is super hot?

What about taking the thermostat out ? will that help a bit ?

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Old 04-19-2019, 07:27 PM   #6
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Default Re: Overheating again

When the engine overheated, did you stop and open the hood to see/hear the cooling fan running? Even in stopped traffic, either get off to the side of the road or just stop, turn on your hazard lights, get out and point traffic around you until drivers get the point and move around you. Open the hood and see or listen for the cooling fan. Ith one speed fan, it should be blowing hard. A well worn fan may blow slow without any force to move air thru two radiators, the ac condenser coil in front of the radiator and radiator. Do not assume the cooling fan is running and blowing hard.

You can test fan operation without driving. Pull the cooling fan relay, familiarize yourself with the relay pinouts, labeled on all relays. Pins 30 and 87 are the electrical contacts that close to send 12v to the fan. Locate the relay socket with the relay as reference to pinouts and simply insert a small paper clip into relay socket terminals 30 and 87. This should send 12 volts immediately to the cooling fan and power it without turning on ignition. The fan either powers up and runs at full force or not. It should run hard, not slow. An original cooling fan may be worn out by now.

From the service manual: Under normal operating conditions, the cooling fan motor operates whenever the ECT is greater than 105.5C (222F) or the A/C relay is commanded ON below 113 km/h (70 mph). The cooling fan motor will turn OFF when the temperature drops below 100C (212F). If the engine is turned OFF and the ECT is above 107C (225F), the cooling fan motor can run up to 4 minutes or run until the ECT drops below 107C (225F) with the ignition OFF. If a low/high ECT circuit fault resulting in DTC P0117 or P0118 is set, the PCM will command the cooling fan relay ON to protect the engine and transaxle until the condition is corrected.

If ac doesn't work, the cooling fan will not turn on, period.

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Old 04-20-2019, 04:39 PM   #7
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Default Re: Overheating again

You guys were right, I disconnected the plug to the heat sensor, I started the car and the fan did not move at all, also max out the ac and also the fan did not work, I am surprise that I have some ac without the fan working.

I am going to test the fan, do you have to take out the radiator in order to change the fan ?

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Old 04-20-2019, 04:53 PM   #8
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Default Re: Overheating again

Nope. I replaced my fan motor in the '99. Wouldn't come on.

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Old 04-20-2019, 05:07 PM   #9
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Default Re: Overheating again

No radiator removal necessary. One caution from the service manual; On models with an automatic transaxle, it may be necessary to loosen the top automatic transaxle oil cooler line and move it out of the way.

The ac partially working is most likely due to forced air thru the front end at speed to cool off condenser coil and radiator. While stopped, the dead or slow cooling fan isn't forcing air thru both radiators so ac overheats less interior cooling occurs. Once up to some speed for airflow, ac cools a little more. Not the best until the fan is replaced.
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Old 04-20-2019, 05:19 PM   #10
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Default Re: Overheating again

What is a good brand for just the motor ?

VDO PM538 for $19 on rockauto ?

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Old 04-20-2019, 06:07 PM   #11
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Post Re: Overheating again

FWIW, I had the very same thing happen on mine about three years ago.
The Rock Auto one should be fine if you can wait for it to be delivered, but I had to fix mine asap so I just bought one from O'Reilly.
They only had the Murray in stock but it worked perfectly.
The VDO might be better, I don't know.

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Old 04-20-2019, 06:11 PM   #12
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Default Re: Overheating again

I bought whatever they had at the local store. It was pretty cheap to just replace the motor.

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Old 04-25-2019, 12:49 PM   #13
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Default Re: Overheating again

I am getting ready to fix the problem, I dont have a multi-meter, can I use a test light ? or can you guys best multimeter other than fluke, looking for something cheap that works ?

thanks

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Old 04-25-2019, 01:05 PM   #14
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Default Re: Overheating again

You don't need a test light to replace the fan. If you have turned on the A/C, and the ambient temp is over 45˚F so that the A/C will turn on, and the fan does not run, it is most likely the fan. If you did want to use a test light to check power to the fan, you could connect test leads of the light to the power terminals for the fan.

Member Richpin has some videos on youtube that show how to do the testing and the removal.

Cooling Fan Troubleshooting
https://www.youtube.com/watch?v=0E6vbQoXSqQ

Cooling Fan Removal
https://www.youtube.com/watch?v=J-FQjlPrqrc

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Old 04-25-2019, 03:14 PM   #15
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Default Re: Overheating again

Quote:
Originally Posted by macbox View Post
You don't need a test light to replace the fan. If you have turned on the A/C, and the ambient temp is over 45˚F so that the A/C will turn on, and the fan does not run, it is most likely the fan. If you did want to use a test light to check power to the fan, you could connect test leads of the light to the power terminals for the fan....
That's partly true - it won't work if ac is broken. The pcm knows from the ac pressure switch whether to allow compressor operation or not. The pcm also knows if refrigerant is lost from damage or leak, it will not turn on the cooling fan at all. Better to suggest this; if the compressor doesn't turn on when trying ac to see if the cooling fan turns on, troubleshooting cooling fan problems this way won't work. Ac demands cooling fan operation but if ac is broken, the cooling fan will not run at all. The coolant sensor will be the one to tell the pcm in determining when to turn on the cooling fan.

The best ways to manually turn on the cooling fan is either disconnect the coolant sensor before starting the engine or insert a wire jumper/paper clip into fan relay socket terminals 30 and 87.

When the coolant sensor fails as in artificially disconnecting it from wiring, the pcm detects sensor failure and defaults by turning on the cooling fan whether or not the engine is overheating to prevent overheating. This may or may not work for all S-series cars but does work for '91-'95 cars. Try it as you have nothing to lose. If sensor disconnect doesn't work, try the wire jumper on the fan relay sockets - it's guaranteed to work as you're sending 12v to power the fan immediately regardless of ignition switch position. You can familiarize yourself with relay pinouts as most relays have pinouts labeled on them, either silk screened on one side or have molded labeling on the bottom. Relay contacts 30 and 87 are closed when fan cooling is needed - jumpering 30 and 87 manually on the relay socket sends 12v to the fan.

In either case, checking for 12v on the fan connector can be done with a 12v test light, multimeter or the fan itself if its in working condition.

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Old 04-25-2019, 03:38 PM   #16
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Default Re: Overheating again

I just want to check in the connector to the fan in getting any power, if a test light work, why spend any money on a fluke

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Old 04-25-2019, 03:47 PM   #17
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Default Re: Overheating again

Any hand made 12v light can be used to check for voltage on any connection. 120vac test lights are used the same way.

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Old 04-26-2019, 08:48 AM   #18
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Default Re: Overheating again

Quote:
Originally Posted by SIRPAULGERMAN View Post
You guys were right, I disconnected the plug to the heat sensor, I started the car and the fan did not move at all, also max out the ac and also the fan did not work, I am surprise that I have some ac without the fan working.

I am going to test the fan, do you have to take out the radiator in order to change the fan ?
www.car-part.com

Order a used cooling fan assembly from a yard. Aftermarket replacement fans can often have minor fitment issues, or are sold as motor/impeller blade-only assemblies and can be problematic to change/install.

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