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Radiator Fan Motor Replacement

 
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  #1 (permalink)  
Old 04 Mar 2017, 09:10 am
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Default Radiator Fan Motor Replacement

Hello everyone, since I'm new here I'll introduce myself before posting my question. My real Name is David, I'm 33 and I live in Chile (yeah, that's in South America). I drive an 03 PT Base with 139K miles, had it since 2007 and I do all of the basic manteinance myself (oil changes, spark plugs, some sensor replacement, etc). It's been an absolute pleasure driving the PT, I love it.

So here's my question: Radiator fan motor low speed (common issue, as I've read) is not working. The test I've made is putting 12v directly to both leads of the terminal (center lead is gound) in the radiator fan: one of them works (high speed) an the other one doesn't. The fan works fine when the the engine is hot enough (right in the middle between H and C on the temp gauge) and turns off when it should too. So I'm replacing the fan, but since there's no parts for the Cruiser here in my country (is a rare car here), I have to import them from the States, being Rockauto the best choice for me. So shipping costs are the issue, I know that the best thing would be just get the whole assembly, but that is kind of expensive ($150 just for the shipping of a $50 part). I've looked up and they sell just the electric motor (including the terminal), which is great since the shipping cost reduces to $43 for a $47 part. The question (finally): has anyone replaced just the fan motor? is it too hard? Thanks!!

Here are the links for the parts I'm shopping:

Fan whole assembly: https://www.rockauto.com/en/moreinfo...sn=345&jsn=345

Fan motor: https://www.rockauto.com/en/moreinfo...sn=518&jsn=518

PS.: English is not my main language, so I'm sorry if sometimes I don't make myself clear

Last edited by DragonFenix; 04 Mar 2017 at 09:12 am.
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Old 04 Mar 2017, 10:33 am
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Default Re: Radiator Fan Motor Replacement

Welcome to the forum.

Your English is fine. It's a shame the shipping expenses are so much. What you really need are the brushes inside the motor. The brushes are the 4 oblong gray pieces that are around the inner rotor winding's of the motor and that's what wears out and all that needs to be replaced but the next best thing in your case is probably just the motor itself. Here's some pictures of what it all looks like inside the motor.





You can see how at least two of the brushes are much shorter than the other two and that's why in this case the low speed part of the motor will not work because they are to short to reach the center winding's (rotor) .

Last edited by CREWZIN; 04 Mar 2017 at 10:37 am.
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Old 04 Mar 2017, 10:56 am
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Default Re: Radiator Fan Motor Replacement

Welcome to the forum
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Old 05 Mar 2017, 04:00 am
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Default Re: Radiator Fan Motor Replacement

Quote:
Originally Posted by DragonFenix View Post
Hello everyone, since I'm new here I'll introduce myself before posting my question. My real Name is David, I'm 33 and I live in Chile (yeah, that's in South America). I drive an 03 PT Base with 139K miles, had it since 2007 and I do all of the basic manteinance myself (oil changes, spark plugs, some sensor replacement, etc). It's been an absolute pleasure driving the PT, I love it.

So here's my question: Radiator fan motor low speed (common issue, as I've read) is not working. The test I've made is putting 12v directly to both leads of the terminal (center lead is gound) in the radiator fan: one of them works (high speed) an the other one doesn't. The fan works fine when the the engine is hot enough (right in the middle between H and C on the temp gauge) and turns off when it should too. So I'm replacing the fan, but since there's no parts for the Cruiser here in my country (is a rare car here), I have to import them from the States, being Rockauto the best choice for me. So shipping costs are the issue, I know that the best thing would be just get the whole assembly, but that is kind of expensive ($150 just for the shipping of a $50 part). I've looked up and they sell just the electric motor (including the terminal), which is great since the shipping cost reduces to $43 for a $47 part. The question (finally): has anyone replaced just the fan motor? is it too hard? Thanks!!

Here are the links for the parts I'm shopping:

Fan whole assembly: https://www.rockauto.com/en/moreinfo...sn=345&jsn=345

Fan motor: https://www.rockauto.com/en/moreinfo...sn=518&jsn=518

PS.: English is not my main language, so I'm sorry if sometimes I don't make myself clear

Why don't you just take your fan to a specialty shop that repairs automotive starters and alternators ? After taking apart the fan motor they should be able to make repairs from their parts bin for less than a new component costs.
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Old 05 Mar 2017, 12:06 pm
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Default Re: Radiator Fan Motor Replacement

This company might have the brushes you need to get your radiator fan going again. Another member was able to replace the brushes from this company.

Brushes Main Page

They might still have the 7 by 10 mm (1/4" by 3/8") by 22 mm long but that is about 2 to 4 mm too long.
Part number is L7-10H

Verify the brush size in your radiator fan before ordering the brushes.

You might need to cut of 3/16" off each brush. One of the brushes has a black mark on it where all the new brushes might need to be cut off.

RadiatorCarbonBrushes.jpg
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Last edited by ptcruisersteve; 05 Mar 2017 at 12:39 pm.
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Old 05 Mar 2017, 04:17 pm
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Default Re: Radiator Fan Motor Replacement

That's awesome, never thought of replacing just the brushes. The thing is: is it too hard to remove the fan motor from its assembly? or is it just a couple of bolts? Because I'll certainly go in that way.

Thanks guys for the great responses!
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Old 05 Mar 2017, 04:25 pm
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Join Date: Feb 2014
Posts: 5
Default Re: Radiator Fan Motor Replacement

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

Your English is fine. It's a shame the shipping expenses are so much. What you really need are the brushes inside the motor. The brushes are the 4 oblong gray pieces that are around the inner rotor winding's of the motor and that's what wears out and all that needs to be replaced but the next best thing in your case is probably just the motor itself. Here's some pictures of what it all looks like inside the motor.





You can see how at least two of the brushes are much shorter than the other two and that's why in this case the low speed part of the motor will not work because they are to short to reach the center winding's (rotor) .
BTW, those are amazing pictures, very clear! Do those brushes come with a spring inside the guides?
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Old 05 Mar 2017, 04:54 pm
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Default Re: Radiator Fan Motor Replacement

Quote:
Originally Posted by DragonFenix View Post
BTW, those are amazing pictures, very clear! Do those brushes come with a spring inside the guides?

I've never taken the motor apart myself but I would think there has to be some sort of "spring" pushing the brushes towards the center winding/rotor or something inside the guides.
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Old 05 Mar 2017, 05:06 pm
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Default Re: Radiator Fan Motor Replacement

There should be, otherwise there'd be nothing to assure contact between the brush and the center piece. I'll look into it, thanks!
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Old 05 Mar 2017, 06:15 pm
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Default Re: Radiator Fan Motor Replacement

There is 4 little springs that look like glasses from a straight on look that are used to keep pressure on the brushes. The springs are shown on the image below. Don't lose them when you take the old brushes out.

Radiator fan springs.jpg
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