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Radiator fan won't run

 
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Old 22 Sep 2018, 05:40 pm
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Default Radiator fan won't run

Afternoon! Having issues with my cooling system. I had a radiator fan go bad recently, I replaced it with a brand new unit and also replaced a blown fuse for it.

Also topped off the coolant jug.

Now, while idling for a minute or two, the temp starts climbing, north of 220. Any ideas? When I replaced the fan, it worked. Now it won't. I just replaced the high speed fan relay. The new fan runs when I turn the a/c on, but seems to be going comparatively slow.

I'm stumped! Should I replace the low speed relay? Thanks!
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Old 22 Sep 2018, 06:41 pm
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Default Re: Radiator fan won't run

I would suggest checking the wires going to the engine temperature sensor and the sensor itself. Check to make sure you don't have air in the coolant system. Take the radiator cap off after it cools off to see if the coolant is filled to the top. How are you checking that the temperature is at 220 degrees.
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Last edited by ptcruisersteve; 22 Sep 2018 at 06:45 pm.
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Old 22 Sep 2018, 06:56 pm
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Default Re: Radiator fan won't run

When you bought the fan, did you get just the fan or the fan that included a new wiring harness and relays?
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Old 22 Sep 2018, 07:08 pm
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Default Re: Radiator fan won't run

I'm checking the temperature via a Bluetooth scan tool that gives a live readout. Also, after about 220, the temp gauge starts slowly rising. When I got a fan, it had the fan and shroud and a new harness all the way to the power clip. The coolant was a bit low in the bottle so I added some. When I had the car apart to work on the new fan I had the rad cap off ant it was a bit low, again, why I added coolant. It drank about a half a jug. Save for taking the hood off RoadKill style, any other ideas? I'm starting to suspect the low speed relay.
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Old 22 Sep 2018, 07:20 pm
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Default Re: Radiator fan won't run

Quote:
Originally Posted by rckstein View Post
When you bought the fan, did you get just the fan or the fan that included a new wiring harness and relays?
I have a (Used) spare set that is functional if you need it
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Old 22 Sep 2018, 07:24 pm
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Default Re: Radiator fan won't run

I would suggest after unplugging the radiator fan manually applying 12 volts at the plug for both speeds. This will help tell you the problem is before the radiator fan circuit or in the radiator fan circuit.

If both speeds are good and you have a first generation Pt Cruiser I would check both fuses first. You might have a fuse that is continuously blowing.
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Last edited by ptcruisersteve; 22 Sep 2018 at 07:32 pm.
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Old 22 Sep 2018, 07:37 pm
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Default Re: Radiator fan won't run

How should I apply 12 volts? Just grab some wires and connect them to the battery? It's a 3 prong harness. I'm guessing one is neutrak, one is high speed and one is low?
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Old 22 Sep 2018, 07:42 pm
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Default Re: Radiator fan won't run

Quote:
Originally Posted by Macgyverman1123 View Post
How should I apply 12 volts? Just grab some wires and connect them to the battery? It's a 3 prong harness. I'm guessing one is neutrak, one is high speed and one is low?
I remember dicking around with this, I just hooked it to my battery, the pins one the outsides are the ones that get power... I think
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Old 22 Sep 2018, 08:33 pm
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Default Re: Radiator fan won't run

I'll check the fuse and the power connector, is it worth replacing the low speed relay too?
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Old 22 Sep 2018, 08:34 pm
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Default Re: Radiator fan won't run

Quote:
Originally Posted by Macgyverman1123 View Post
I'll check the fuse and the power connector, is it worth replacing the low speed relay too?
When I bought a fan (I bought mine from ebay it was like $60 vs $300 at Napa) it came with new relays
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