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Radiator fan issues

 
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  #1 (permalink)  
Old 29 Mar 2015, 09:29 pm
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Default Radiator fan issues

Hello,
I bought a 05 pt today. The radiator fan and ac doesn't work so I have been doing some research and I have found a lot of material. So tomorrow I am going to grab my multimeter and start crossing stuff off the list of things it could be.

But my question is if it is the pcm who are the reliable remanufacturers is their someone online or do I need to deal with chrysler? Thanks
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Old 29 Mar 2015, 10:14 pm
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Default Re: Radiator fan issues

Welcome to the forum.

I would suggest checking out the radiator fan before looking at the PCM.
JoeX and buddyiramae like this.
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Old 30 Mar 2015, 11:52 pm
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Default Re: Radiator fan issues

Quote:
Originally Posted by ptcruisersteve View Post
Welcome to the forum.

I would suggest checking out the radiator fan before looking at the PCM.
That is the general idea, But not the answer to my question.
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Old 31 Mar 2015, 01:32 am
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Default Re: Radiator fan issues

You can get a PCM online or go to the dealer.
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  #5 (permalink)  
Old 31 Mar 2015, 01:59 am
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Default Re: Radiator fan issues

If you want to make sure you need a PCM I would get an OBDII Scan Tool and let us know what your engine trouble codes are?

A little history of your PT Cruiser would help such as mileage, if repairs have been completed on it recently.
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Old 31 Mar 2015, 01:43 pm
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Default Re: Radiator fan issues

Today I tested the fan it works fine. So I moved on to the relays they are working. So I tested for continuity between the power dist box and the fan plug no issues there. Codes are (p0481). Any more ideas?

As for history I bought this car knowing it had these issues. The fellow I bought the car from said the local repair shop said it needed a new pcm and it would cost $1400 to replace. I have talked to my local dealer their price for replacement is $617 for the unit plus $150 for programing and installation.

The car has 147K on it I got it for $800 as a fixer upper for the wife as a anniversary present she has wanted one for a while.


Thanks for your help.
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Old 31 Mar 2015, 03:54 pm
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Default Re: Radiator fan issues

I would reset the engine trouble codes and see if the same code comes back.

Usually the radiator fan is the weakest link when the fans don't run.

The PCM is what supplies the low voltage side of the high and low relays with the power to close the relays and allow the higher voltage to go to the proper side of the fan motor. The A/C has to be turned on or the engine temp. has to reach a certain point and this info has to be sent to the PCM for the PCM to close the relay to turn on the fan. I would check the ECT - Engine Coolant Temperature Sensor first.
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Old 31 Mar 2015, 04:16 pm
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Default Re: Radiator fan issues

Quote:
Originally Posted by d1d35 View Post
Today I tested the fan it works fine. So I moved on to the relays they are working. So I tested for continuity between the power dist box and the fan plug no issues there. Codes are (p0481). Any more ideas?

As for history I bought this car knowing it had these issues. The fellow I bought the car from said the local repair shop said it needed a new pcm and it would cost $1400 to replace. I have talked to my local dealer their price for replacement is $617 for the unit plus $150 for programing and installation.

The car has 147K on it I got it for $800 as a fixer upper for the wife as a anniversary present she has wanted one for a while.


Thanks for your help.
How did you check your radiator fan?
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Old 31 Mar 2015, 07:25 pm
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Default Re: Radiator fan issues

I tested the radiator fan by attaching a probe to a 12v source an touching it against the high and low pins on the fan connection.

I am an electrical engineer so I kind of have an idea of what I am doing.

I have read a ton of info on this particular issue you all keep telling me the same things I have tried.

I just wanted to find out if their was another option besides the dealer on a replacement PCM that was trust worthy.
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Old 31 Mar 2015, 07:31 pm
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Default Re: Radiator fan issues

Quote:
Originally Posted by ptcruisersteve View Post
I would reset the engine trouble codes and see if the same code comes back.

Usually the radiator fan is the weakest link when the fans don't run.

The PCM is what supplies the low voltage side of the high and low relays with the power to close the relays and allow the higher voltage to go to the proper side of the fan motor. The A/C has to be turned on or the engine temp. has to reach a certain point and this info has to be sent to the PCM for the PCM to close the relay to turn on the fan. I would check the ECT - Engine Coolant Temperature Sensor first.
Quote:
Originally Posted by d1d35 View Post
I tested the radiator fan by attaching a probe to a 12v source an touching it against the high and low pins on the fan connection.

I am an electrical engineer so I kind of have an idea of what I am doing.

I have read a ton of info on this particular issue you all keep telling me the same things I have tried.

I just wanted to find out if their was another option besides the dealer on a replacement PCM that was trust worthy.
I can't read your mind. Did you check the Engine Coolant Temperature Sensor?
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