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Old 26 Nov 2017, 08:52 am
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Default Cooling fan

Since the cooling fan for the engine doesn't run when the A/C is on in my PT, i measured the connection on the fan over the black/green which was "infinite" while the black/yellow gave about 2,6Ohms.

I guess black/yellow is for engine cooling, while black/green seems shot and most likely for the A/C. Is this a common problem and how should it be fixed?
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Old 26 Nov 2017, 10:19 am
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Default Re: Cooling fan

Have you checked the relay..??
oldthom likes this.
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Old 26 Nov 2017, 12:06 pm
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Default Re: Cooling fan

I believe you have an 2003 2.0 correct?

Page 8W-42-6 of the 01-04 service manual shows that the 3 wires going to the fan motor are:
1. Low Speed - Dark Green
2. High Speed - Yellow
3. Ground - Black

If you have 2.6 Ohms between the Yellow and Black wires, it means your High Speed fan ought to work. If you have an open connection between the DG and Black, the low speed will not work. Most likely the low speed brushes are worn out.

If you lived in the US, you could just order a new fan from Rock Auto for $50-$80 or just the motor for $48-$55

I don't know how difficult it is to get a replacement where you live so if you must rebuild the motor (replace the "brushes" which are actually copper bars), follow this link:

Radiator Fan Motor Replacement

Interesting thread and maybe a fun little project.
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Old 26 Nov 2017, 01:41 pm
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Default Re: Cooling fan

I would suggest applying 12 volts to both speeds on the radiator fan to verify the radiator fan needs to be replaced. It's very common for the low speed on the radiator fan to go out.
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Last edited by ptcruisersteve; 26 Nov 2017 at 01:45 pm.
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Old 26 Nov 2017, 01:56 pm
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Default Re: Cooling fan

Quote:
Originally Posted by rsrocket1 View Post
I believe you have an 2003 2.0 correct?

Page 8W-42-6 of the 01-04 service manual shows that the 3 wires going to the fan motor are:
1. Low Speed - Dark Green
2. High Speed - Yellow
3. Ground - Black

If you have 2.6 Ohms between the Yellow and Black wires, it means your High Speed fan ought to work. If you have an open connection between the DG and Black, the low speed will not work. Most likely the low speed brushes are worn out.

If you lived in the US, you could just order a new fan from Rock Auto for $50-$80 or just the motor for $48-$55

I don't know how difficult it is to get a replacement where you live so if you must rebuild the motor (replace the "brushes" which are actually copper bars), follow this link:

Radiator Fan Motor Replacement

Interesting thread and maybe a fun little project.
Interesting, are you saying there are separate brushes for high and low speed?
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Old 26 Nov 2017, 04:47 pm
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Default Re: Cooling fan

Quote:
Originally Posted by ed9msi View Post
Interesting, are you saying there are separate brushes for high and low speed?
Yes....read the link below.

New here....and a question
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Old 27 Nov 2017, 06:39 am
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Default Re: Cooling fan

Quote:
Originally Posted by LionPT View Post
Have you checked the relay..??
Which relay are we talking about and where is it located?
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Old 27 Nov 2017, 08:41 am
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Default Re: Cooling fan

Since you already disconnected the fan plug, why don't you simply apply 12 volts across the pins to see if the fan spins?

Use insulated clips so you don't short them out and use at 12 gauge wire to carry the current (although you can get away with smaller gauge wire if you test for only a couple of seconds). It sure appears as if your low speed brushes are worn out.
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Old 28 Nov 2017, 06:52 am
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Default Re: Cooling fan

Just bought 4 new brushes which are 1mm to big 8*10 mm instead of 7*10 but only 18 mm long so i have to adjust them on the side instead of the length compared to the picture in this forum. How hard is it to dismantle the engine once you get the fan out?
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Old 28 Nov 2017, 08:56 am
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Default Re: Cooling fan

Quote:
Originally Posted by ed9msi View Post
Just bought 4 new brushes which are 1mm to big 8*10 mm instead of 7*10 but only 18 mm long so i have to adjust them on the side instead of the length compared to the picture in this forum. How hard is it to dismantle the engine once you get the fan out?
Wouldn't it be easier if you got some brushes that had the correct width and the length a little long? How are you planning to get it to the correct width?
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