How to determing if its the AC Blower or AC speed control?

[dohc324ci]

Hey fellas,

I did a search and found many post on this but, I am trying to determine which part to purchase to solve my problem?

Common threads say replace AC Blower or AC speed control?

My heat/AC isnt blowing anything? When set on heat I can feel heat (barely) and can switch from DEF/VENT/FLOOR and seems to be functioning fine. I also hear the compressor kick on when turning the H/AC on.

Dealer quoted:
AC Blower is $340
AC Speed control $140

Final question are these parts difficult to install?

[Marauderjack]

Unplug the blower motor.....passenger side under hood.....with jumpers connect it directly to the battery (doesn't matter about polarity as it will run both ways)!!:beer: If it runs (full speed) it is the control module which lives in the plenum right behind the passenger side valve cover.:cool:

Sometimes you can smack the control module with a screw driver and it will work again??:confused:

If you need the control module they are only $30.00 or so and FWIW Ford has had a lot of them go bad!!:argue:

I can send you photos and help you with the R & R if you elect do it yourself!!:beer:

Good Luck!!

Marauderjack:burnout:

[dohc324ci]

Yes pictures would be great! Thanks for the info!

[Egon Spengler]

Could it be the Blower Motor resistor? (I think that is what it is called) My girlfriends taurus has the same problem and I was told the blower motor resistor... I dunno... just throwing it out there

[Marauderjack]

Could it be the Blower Motor resistor? (I think that is what it is called) My girlfriends taurus has the same problem and I was told the blower motor resistor... I dunno... just throwing it out there


It is the "Blower Control Module"...attached is a photo!!:cool:

The part with the cooling fins is inside the blower plenum and.....YES, it is a bit of a PITA to remove and replace but you can do it without removing the valve cover!!!:beer:

Marauderjack:burnout:

[RF Overlord]

Could it be the Blower Motor resistor? There is no resistor in the Marauder. That's only for cars with 3-speed (OFF-LO-MED-HI) heater fans. The Marauder heater uses PWM (pulse-width modulation) for infinitely-variable fan speed and has a separate PWM controller module.

[dohc324ci]

It is the "Blower Control Module"...attached is a photo!!:cool:

The part with the cooling fins is inside the blower plenum and.....YES, it is a bit of a PITA to remove and replace but you can do it without removing the valve cover!!!:beer:

Marauderjack:burnout:

Your the MAN!

Cheers:beer:

[Badger]

Yeah. I just had to replace mine as well this summer.

[Go Mifuni]

Yeah. I just had to replace mine as well this summer.

Me too, last winter.

[Badger]

Meanwhile my 98 P74 has never needed this part replaced. Something tells me they are cheapening parts.

[Marauder386]

I did the "hit - it " test on the blower, then did the direct hookup...it works so its the B C M ...

Now, I spent 30 minutes looking for its location and I must be a moron...no findit ! Any guidance and instruction accepted ! Oh, and I do have the D R cooling mod back there too...

Maybe a sticky for this for future generations to refer too ?



:cool:

[Marauder386]

Gee thanks, I will post up fotos of the project for future reference...


:cool:

[NavHeliRescue]

Although the postings on this thread are over a year old they still saved me the headache of dealing with service repairs and money.

Since I live in San Diego I could not tell you the last time I used the heating/AC in my car, but I went to turn it on this morning to clear a fogged up windshield (I was awake earlier than I normally am) and I got nothing. Much like others have discribed, I was able to hear the williness of the system wanting to switch between whatever setting I put it at (Vent, AC, Floor) and was able to hear the AC compressor kick in, but no fan.

Oddly, I read this thread, went down with a pair of needle nose (thinking I might need to pull a fuse and check) and smacked the blower motor that is under the hood on a passengers side - it fired right up.

M-jack, I'd buy you a beer or two or three for that lil tid bit of info...saved me greatly!

Thanks

[Marauderjack]

Glad I could help you!!:beer:

My service manager said an elderly couple from Florida came in a few years back in a MGM with the BCM symptoms but he didn't have one in stock so he smacked it with a screw driver and the blower began to work!!!:eek: They stopped in a year later and it was still working OK??:D

I have heard you can remove the large transistor and re-coat the base with heat transfer gunk and it will be OK......for me a new piece was in order since it is a PITA to R & R!!!!;)