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Since your low speed has most likely failed on your radiator fan I would suggest replacing the radiator fan. Considering the cost of replacing the head gasket can be expensive compared to an estimated $85.00 for a radiator fan I would order a new radiator fan immediately. I have kept a brand new radiator fan in my garage in case the radiator fan fails in one of my Pt Cruisers. I have never overheated the engine as I don't take chances with any part of the coolant system not working properly. I am also thinking that your engine light is on all the time with the low speed relay being removed triggering P0480. This is not a good idea as you will not know if you start to have other problems with the Pt Cruiser unless you use an OBDII Scan Tool continuously. This can leave you walking.
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If at First You Don't Succeed - Try, Try Again Last edited by ptcruisersteve; 04 Jul 2018 at 12:41 am. |
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So from what I can tell, either the radiator fan is burnt out, the wiring is bad, or the ecu isn't sending a signal to the relay to engage. I'm a bit confused however because it doesn't make sense that the fan would not turn on high if it turns on low. Low speed still accepts 12v and simply passes it over a resister to lower it to 6v (correct me if I'm wrong here). So in theory, the fan on high is just receiving the direct 12v connection. In that sense, the motor itself would have to be dead, but then I would think neither high or low would function. Right?
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Best thing to do is to disconnect the radiator fan plug and apply 12 volts to the low speed and high speed one at a time. Until this is done you will be guessing on why the one speed on the radiator fan is not working.
Radiator fan brushes.jpg Diagram below is for a 2001 Pt Cruiser. Schematic-PT-Cruiser 2001 radiator fan circuit.jpg If the radiator fan is working properly on both speeds when you manually apply 12 volts I would suggest checking fuse#5.
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If at First You Don't Succeed - Try, Try Again Last edited by ptcruisersteve; 04 Jul 2018 at 07:00 pm. |
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I am on my 3rd radiator fan. It is relatively easy and fast to replace. I can do one now in about 30 minutes. Your first time may take a little over an hour. I think you only needed an 8mm and 10mm socket + something to clamp down the coolant hose to make sure you don't spill any. Go to www.rockauto.com and order yours asap. Sure you can find out what is wrong with it and possibly only replace a relay but... my time isn't worth the diagnosis. If you remove the relay found at the very bottom of the fan (you can reach it by just laying on the floor) and plug it back in, most likely it will start working again... only to fail a few days later. First time I replaced the fan, it lasted 4 years. I just died on my again a few weeks ago. I'm sure others are more educated and can actually figure out what is wrong with the fan. (If you do buy one, you need to find out which fan you have. That can be done by counting the relays on the fan itself. I believe my 2006 had 4 relays |
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