Blower Motor

9935 Views 22 Replies 9 Participants Last post by rtkraken, Sep 18, 2010

pyro

Discussion Starter · Sep 11, 2010

First, I want to say thanks to everyone who posts here, I have been able to find the answers to all of my questions the past 5 years without having to register or post - so thank you

The car, 2000 P-38 4.0

Now, for the problem: The air conditioning system is not working anywhere near as good as it should! I have a left hand blower motor that is not running and my wife is complaining as we live in the Mojave desert
- Pollen filters are on order - I cleaned the ones in there until they arrive - they were filthy
-Relay 7 has been replaced after looking through the relay bin at Autozone (duralast 19899 fit perfectly)
--There appears to be only minor damage to the fuse box even though the relay was burned out.
-I checked with a test light, and there is voltage to the red wire that goes into the blower motor

Is it possible that I am not getting enough amps to run the blower through the line even though the test light goes on? it was an LED test light
Is there a way to tell if the blower motor is burnt out or if it is just a bad fuse box?

Any help on narrowing down the problem and fixing this would be appreciated. My wife loves the car and I just installed headrest monitors for the kids, so I would really like to get this fixed ASAP

Thanks

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Jos Geuze

· #3 · Sep 12, 2010

Hi

There are speed control electronics built in the blower and these might be faulty. The red wire should always have 12 V DC on. The speed control system completes the path to earth with a supply voltage lower then the 12 V. If you remove all connectors, and connect spade connectors to the top connectors direct to the carbon brushes, the fan should run at full speed.

See the picture below from a fan with the plastic cover removed.

Regards

Jos

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Jos Geuze

· #16 · Sep 13, 2010

Hi

In the previous photo I posted a photo from the blower with the plastic cover removed. At the center of the photo at the top of the electro motor you see the conection of the power to the motor. This connection consist out of two connector tabs.

In the photo above the plate turned upside down with the connector tabs vissible. Connecting this two tabs to 12 VDC power source and the fan should turn on at full speed. If it doesn't the motor is burned or the carbon brushes do not make contact.

My suggestion is to get 12 VDC from the cigarette lighter socket and connect it up to the fan connection tabs. If the fan motor is ok then it will run. Next step is to check the electronics.

Regards

Jos

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Jos Geuze

· #17 · Sep 14, 2010

Hi

One photo I took today. The red and black wire going in at the connector are the connections where you need to apply the 12 VDC as mentioned in my other post.

Regards

Jos

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Jos Geuze

· #20 · Sep 17, 2010

Hi

Inside the blower casing are the speed electronics. According to the drawings from rave this electronics do have a relay incorporated. These components are inside the plastic casing. To get to them take out the fan motor and remove the plastic cover.

The cover has holes at the sides if I remember correctly 3 holes. Stick a screw driver in the hole and push on the rubber while pulling on the plastic housing. Hold it firmly and push the next rubber block and after a few attempts the plastic will come off.
After the plastic is removed you can clean the fan motor and inspect the carbon brushes.

If the blower is running at full speed it indicates a short to earth that bypasses the speed regulation electronics.

Good luck

Jos

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