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  #1 (permalink)  
Old 18 Jun 2015, 09:18 am
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Default Radiator fan issue

I'm looking at my daughter's PT Cruiser. It overheats while in idle. At a light or standing still. But cools down on the road.
Just now while running it in the driveway it finally pushed coolant out through the radiator cap and coolant reservoir. Boiling hot.
My original thought was to replace the thermostat and did that but didn't listen for the fan to be running.
Lo and behold the fan never turned on after replenishing the coolant and running it.
The fuses are good, so I got under the front, disconnected the power connection to the fan and jumped the pins. Middle pin is ground, one side is high speed the other is low speed. Both jumps started the fan. So on to the relays. Both tested good with an ohmmeter and were put back in.
Then I got a bright idea to start the car, pull the high speed relay and jump the pin slots to see if the fan would start. As soon as I pulled the relay the fan started and apparently ran on high speed and continued to run after the relay was replaced. Drove around, sat out several traffic lights, turned on the AC and all was well.
Turned the car off, and later ran it again but the fan didn't turn on until I pulled the relay.
So my question is "why". This seems contrary to what a relay is supposed to do.
Thanks, H..
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Old 18 Jun 2015, 09:39 am
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Default Re: Radiator fan issue

In the Power Distribution Center, the horn relay (A) is the same as the High Speed relay (F), swap them and see if the horn still works. You may just have a bad relay for the High Speed.

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Old 18 Jun 2015, 10:13 am
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Default Re: Radiator fan issue

Quote:
Originally Posted by henryk View Post
I'm looking at my daughter's PT Cruiser. It overheats while in idle. At a light or standing still. But cools down on the road.
Just now while running it in the driveway it finally pushed coolant out through the radiator cap and coolant reservoir. Boiling hot.
My original thought was to replace the thermostat and did that but didn't listen for the fan to be running.
Lo and behold the fan never turned on after replenishing the coolant and running it.
The fuses are good, so I got under the front, disconnected the power connection to the fan and jumped the pins. Middle pin is ground, one side is high speed the other is low speed. Both jumps started the fan. So on to the relays. Both tested good with an ohmmeter and were put back in.
Then I got a bright idea to start the car, pull the high speed relay and jump the pin slots to see if the fan would start. As soon as I pulled the relay the fan started and apparently ran on high speed and continued to run after the relay was replaced. Drove around, sat out several traffic lights, turned on the AC and all was well.
Turned the car off, and later ran it again but the fan didn't turn on until I pulled the relay.
So my question is "why". This seems contrary to what a relay is supposed to do.
Thanks, H..
The cooling fan motor has two speeds and on low speed cooling it cycles a lot. Low speed works cooling the radiator when AC is not on.
The brushes in the motor or the complete assembly needs replace if its anywhere near 100,000 miles.
as they get closer to 100,000 you probably will see it work intermitently.

Rockauto.com gets you a new fan assembly.
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Old 18 Jun 2015, 11:00 am
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Default Re: Radiator fan issue

Thank you both for your replies.
Ran outside to swap the relays and discovered she has no horn either.
But thanks for the diagram. Her car is missing the housing cover.
Same action with either relay.
This car has 128K+ but the fan was replaced 2 yrs ago. The fan did run when I jumped the wiring harness contact pin. It did seem to run on hi when each pin was jumped. Could a single speed fan have been used? Any way to tell them apart?
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Old 18 Jun 2015, 01:31 pm
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Join Date: Jun 2015
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Default Re: Radiator fan issue

Hey Crewzin!
You may have hit the nail on the head.
When I swapped out the horn and fan relays the engine was cool. So no fan.
I left the relays swapped out.
Trying to go in another direction I had the car running and suddenly the fan came on. I turned on the AC and it worked. Later I turned off the AC and the fan ran for a bit then shut down. More idling and voila it came on again.
So, thank you. I'll continue to keep an eye on it and my next project is the horn.
H..
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Old 18 Jun 2015, 02:46 pm
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Default Re: Radiator fan issue

Thanks for getting back to us with results. I deleted the other thread in the Tech section as you already had a couple of replies here so no use having another thread going at the same time.
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