Hey guys,

According to the searches I've done on this forum, whenever a blower motor fan is intermittent, usually it is drawing too many AMPS from the resistor and the computer is shutting it down.

Well, I just bought a refurbished resistor and a used blower motor (both I can return..); I put in the new resistor and the blower motor, and immediately upon turning on the car the fan moved, but for 2 seconds, than shut off.

I restart the car, and the same thing. Dammit. Before I return these items, I wanted to confirm my assumption based on the info on these forums (which are a great resource). Is it the blower motor thats causing the intermittency?

 

What year is your car?
If it is a 1995 try pulling the codes.
If not I wish you could have the climate codes pulled that would really help alot.

 

It is a 1993 GLT. How can I pull the codes? Is that something Advance Auto Parts or AutoZone will be able to do for me?

 

I guess I'm wondering what else it could be. If not the resistor/blower motor, than the ECC unit? I have the glovebox out, etc, and when I press the REC button I see the unit moving the panel inside the dash that routes outside/inside air through the cabin. The fuses are all intact, and no weird popping sounds ever happened like some people have mentioned hearing.

Thanks for your reply!

 

Climate Control is B1
Follow link to learn how to pull codes.
http://www.troublecodes.net/Volvo/

I have to leave for now but will be back later this afternoon or this evening.
Try pulling and clearing all codes.
Keep track of them and let me know.
I will reply back when I can.

 

there is no blinking any more. I plugged in the resistor again with the blower motor, and its just intermittent in turning on/off. No blinks!

 

But still check the codes again.

 

Hey Tech,

With both the new resistor, new blower motor, and old resistor, I get 2-2-1.

 

damn, its not even intermittent any more w/ the new resistor. ugh.

 

221= Passenger side shutter motor.
Might be the blend door motor.

Maybe the controller is bad now.

Do you have ECC or MCC?

 

I'm really at a loss with this thing. When I bought the car, I knew there was a problem with this. No fan at all would turn on.

I replace the resistor/blower motor, and it does nothing. I turn car on again it works for 2 seconds, and now nothing at all once again.

I have ECC. The ECC unit itself seems to work fine; air gets hot/cold that oozes out of the vents (obviously not being propelled by the blower motor), the REC button moves the flap behind the blower motor, the A/C button works because you can hear the condenser kick in when the button is pressed. I can also reroute air just fine.

Shutter motor.. I have no idea what that is.. lol.

 

Tech, wouldn't it be an ECC, since there seems to be no DTC functions in the MCC? I went over the factory manual and all controls seem to be mechanical.

This may be too late but I'll attach pics that may be of some use. Note, that I'll delete them within the next few days so be sure to save them in your PC before I delete them.


JPN

 

2nd post.

Code 221 seems to indicate open or short circuit to driver/pax damper motor. It could be connection problem too; I would try contact cleaner or inspect the connectors at the damper motors to see if any chafed/loose wires. A digital multimeter would be very helpful.


JPN

 

Pics saved. Thanks JPN! I'm really confused why a 'damper' motor would prevent the blower/resistor from functioning? Is it a break in a circuit?

A few people have said they think its the ECC unit, however the REC damper motor, temp damper motor, etc. all work fine (when told to do so by the ECC)..

So if one function of the ECC goes bad, could it be the whole unit? Damn this is a PITA.

 

Generally it is either the blower motor or the resistor (power stage) that gives you fan control trouble. I wonder if it could have been due to faulty blower fan, or if the new resistor you've tried was defective (once a while you get new part that is already defective). Try simple things first and then gradually move onto more complicated units/sections.

I'll post diagrams; I've traced all wires & components that could affect the performance. The best thing to do at the moment, if at all possible, is to find a good-known unit and swap the ECC head (control unit) to see if the fan responds as it should. If it does, the head is shot and if not, further investigation is required.

I'll again delete the diagrams when you've saved them. Sorry I couldn't help you better, I would follow Tech's advice.


JPN

P.S: The diagrams are for turbo models but should be similar to NA.

[IMG]local://upfiles/6892/67587241F0C14BCEA3933B25D6685D08.jpg[/IMG]

[IMG]local://upfiles/6892/1729B87CCC174B6EA21028960429F663.jpg[/IMG]

 

When mine went bad all functions worked normally but the dash vents.

 

Ok. So I guess a quick way to truly diagnose this is to get a digital multimeter and see if the power going to the blower motor is O.K.

How the hell do I use one of those?!

I REALLY appreciate the help guys.. invaulable.

 

They are easy to use.
Get aohokd of one and we will help.

 

I stumbled across a similar situation you are experiencing while trying to fix my 94850 ACCthat wasnot working on high blower speed and giving me 417 and 418 codes. While looking for a used blower motor resistor at the salvage yards(all the 850ACC'swere stripped of course!), I tried one off an '98 S70 which looked identical.The S70 unit caused my blower to "jump" on high speed for approx 2 seconds and then simply cut off with nofault detectionflashing. This was repeated several times by turning the key completely off and back on again. I gave up and installed a new blower resistor from FCP Groton specifically for a 94and itworks perfectly and also killed the 417 and 418 codes. Maybe your rebuilt unit is not the right year since they look identical, or the rebuild is faulty?Ialso tried different control units and blower motors, but in the end it was the resistor!....tn850

 

You're not going to believe this. A friend found a resistor from a '93 in a local yard and the damn blower motor fired right the F up.


*edit* I'm going to post the part number of the unit that didn't work but the seller from eBay seemed incredibly friendly/knowledgeable, I figured I'd go with it.

I'll get the part number up.