Hitman's Pontiac Trans Am Forum

Trans Am Information => Trans Am Tech => Electrical => Topic started by: fb_rider on May 07, 2006, 10:12:32 PM

Title: Heater blower speed
Post by: fb_rider on May 07, 2006, 10:12:32 PM

It seemed like in the past that if the mode control (heat, a/c, vent, etc) was set to off that the blower did not run at all.  Now the blower runs in low speed no matter what the mode setting is.  The only difference in the off position is that you can't increase the blower speed.  Does that sound right?  If not, what might be the problem (I did already just replace the blower relay).  Thanks.

Title: Heater blower speed
Post by: Eagle 1 on May 07, 2006, 10:38:03 PM

Mine was doing that too.  It turns out that the master switch that is located inside the ac control unit was bad.  Try checking that.

Title: Heater blower speed
Post by: fb_rider on May 07, 2006, 10:48:21 PM

Is that the switch on top of the heat/ac control unit that one of the wiring connectors attaches to?

Title: Heater blower speed
Post by: Eagle 1 on May 08, 2006, 09:42:00 AM

Yes, where all the vacumn lines attach that you were talking about on another thread.

Title: Heater blower speed
Post by: ta78w72 on May 08, 2006, 10:44:36 AM

Most likey it's the A/C control as Eagle 1 said or it's a faulty wire from the low blower delay swtich to the A/C control.

Check the service manual in the A/C section.  They have a trouble shooting section on the blower.

By the way, the blower motor should be running in the low cycle whenever the car is running.  The blower motor should never be off.

Title: Heater blower speed
Post by: Eagle 1 on May 08, 2006, 12:18:34 PM

ta78w72 is right, the blower will be on low when the ignition switch is on.
Actually my car wouldnt change blower speeds when I switched it to medium or high.
Sorry for the confusion.

Title: Heater blower speed
Post by: fb_rider on May 10, 2006, 07:05:18 PM

Just to make sure I understand - so it is correct that the blower runs in low when the ignition is on, even when the mode control (heat/ac/vent/etc) is in the off position?

Title: Heater blower speed
Post by: ta78w72 on May 10, 2006, 09:04:50 PM

Yes, the blower motor runs all the time.  It is a federal safety standard, in case carbon monoxide gets into the car.  By the way, you've got a beautiful car.

Title: Heater blower speed
Post by: stingray on August 07, 2006, 05:16:11 PM

Do you have any pictures or diagrams?

Brett

Title: Heater blower speed
Post by: ta78w72 on August 07, 2006, 07:24:59 PM

stingray, what do you want pictures or diagrams of?

Title: Heater blower speed
Post by: stingray on August 08, 2006, 08:03:51 AM

I was wondering where the AC control relay was that  Eagle 1 had the issue with.

Thanks
Brett

Title: Heater blower speed
Post by: ta78w72 on August 08, 2006, 08:43:07 PM

Eagle1 was referring to the AC control.  That's the one with the slider switches that has the fan switch on the side.  To get to it you need to take the dash Bezel out.....if you don't know how to do that, let us know and we'll take you through it.

It's possible that they pulled the connector out a little when they installed the radio.

Title: Heater blower speed
Post by: kitemare on August 10, 2006, 03:03:48 AM

I think that I had the exact same problem. When I bought my car three months ago they told me that the blower motor did not work anymore & before I took it into the shop to get it fixed I did a little investigating. I took out the glove box & felt around back there & found that there was a plug that had just come undone right behind the fan switch & when I put it back together it worked just fine.

KM

Title: Heater blower speed
Post by: stingray on August 11, 2006, 09:33:04 AM

My problem is that my fan still works it is always on a very low speed, but the slider switch will not increase the speed.

Title: Heater blower speed
Post by: Eagle 1 on August 11, 2006, 10:06:54 AM

Did you check the ac rotary switch that I am talking about?

Title: Heater blower speed
Post by: stingray on August 11, 2006, 03:38:47 PM

I will check it out this week end thanks for you support, this forum is great!!