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Old 03-16-2018, 08:39 AM   #1 (permalink)
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Default Overheating and radiator fan does not turn on by itself

Hi all - I am running into an overheating problem while standing still. The temp gauge will go up to 3/4 mark and the radiator fan will not turn on. I can turn the A/C on or heat at max and the temp starts dropping.

First I had to fix the temp gauge as that wasn't reading correctly. It is now reading correctly. Both fans turn on with the A/C. The radiator fan turns on when jumped at the connector. Upper and lower radiator hose gets hot. Coolant reservoir is filled to max.


I have replaced:
1. temp gauge sender (gauge wasn't reading right)
2. thermostat (thinking this was the gauge issue)
3. Radiator fan (it was seized)
4. Cooling fan fuse (under hood, I think the seized fan blew it)
5. Coolant/radiator fan switch (twice thinking I got a dud)

Is there anything else I should look into?
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Old 03-16-2018, 10:57 AM   #2 (permalink)
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Unplug the fan switch and jump the connector and it should turn on. If not then there is a problem somewhere down the line.

There is a relay you can check too
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Old 03-16-2018, 11:36 AM   #3 (permalink)
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The fan turns on when I jump the fan switch on t-stat housing. Is it safe to assume everything downstream is ok (fuse,relay and fan)?
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Old 03-16-2018, 11:49 AM   #4 (permalink)
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The fan itself works, then.
Next, when it's hot enough for you to believe it should be running, check for volts at the fan end of the cable. If you're seeing power, the fan is getting the supply it needs. That would make me scratch my head.
I'd guess that it's not getting the message to switch on and either the sender isn't working or there's a break in the wiring.
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Old 03-16-2018, 01:54 PM   #5 (permalink)
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Where did you buy the thermo switch from?
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Old 03-16-2018, 07:28 PM   #6 (permalink)
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Autozone. I tested the switch in a pan of boiling water and it closed.
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Old 03-17-2018, 09:37 AM   #7 (permalink)
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And what was the ACTUAL temperature of the boiling water? The switch is designed to close at a set temperature, and as they age, the increase of resistance causes the switch to close at higher temperatures
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Old 03-17-2018, 07:31 PM   #8 (permalink)
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I actually didn't check the temp. You have a good point. I'll have to get a temp gun and re-test.
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Old 03-21-2018, 03:29 AM   #9 (permalink)
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Make sure your cooling system is full and bled out properly also.
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Old 03-27-2018, 08:17 AM   #10 (permalink)
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Wiring is not fun : (

You have my sympathy and subscription, I think this will work out you've got good advice on your side
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