Blower running at 1 speed
 

The heater and A/C fan always runs at the same speed. I have replaced the module, but it still runs at only 1 speed. Any ideas where to go next. I have had the car since November and it was this way when I bought it. 1991 with 50k on it.

Re: Blower running at 1 speed
 

Meaning you can't adjust the blower speed from the control head?
And what module did you replace?

Re: Blower running at 1 speed
 

Yes, only 1 speed. When it is on auto it blows 1 speed. When ii try to change speed manually with the fan arrows nothing happens. It just blows at the same speed. I replaced the blower module in the engine compartment.

Re: Blower running at 1 speed
 

Replace the blower unit. Mine had the same problem. I could tap the outside of the fan blower housing and the fan speed would actually pickup.

Re: Blower running at 1 speed
 

I guess that would be the next part to replace. Thanks goldcylon

Re: Blower running at 1 speed
 

If you need those switches on that are in the engine compartment on the AC cover I have them if you need them

Not sure what they are retail but Lets say $50 plus shipping.

Re: Blower running at 1 speed
 

When you change speed does the display change?

Re: Blower running at 1 speed
 

The display will change fan speed numbers but the fan runs at a constant speed. I have pulled the fuses by the glove box but nothing changes.

Re: Blower running at 1 speed
 

Yep been there and done that. Replace the blower unit which is not ZR-1 specific You can find them all day for any C4 NIB for less than $50. Some with or without the squirrel case which you can simply reuse. I suggest relaxing the bolts on the inner fender well obviouslly on the passenger side. Removing the blower bolts is easy but be mindful of the orifice drain tube position on the underside of the unit. If you dont relax the inside of the fender well you will not have enough room to pull the unit out due to the squirrel cage gets in the way. Very simple job to do and should not take you any more than 30 mins.

Re: Blower running at 1 speed
 

OK. This little problem is kicking my a**. I just replaced the blower motor. Now it seems to move a little more air, but it still runs at only 1 speed! Anyone have any other ideas? This shouldn't be as hard as it is. Thanks.

Re: Blower running at 1 speed
 

Well this sucks. You already replaced the blower controller resistor next to the motor correct? That being the case either the head unit or the programmer above the accelerator is the culprit. Before you buy any more parts I suggest using your red factory service manual fault trees. Then with some codes we can see what is really going on. GC

Re: Blower running at 1 speed
 

Yea, I guess I will need the book sooner or later so I will get one on order. Thanks to all who tried to help. This really is a good group of people. Chris:dancing

Re: Blower running at 1 speed
 

Let us know if you figure it out so you can close the post and help the next member out. FSMs are a great investment to keep your car running.

Re: Blower running at 1 speed
 

Looking at section 8 of the FSM I see that the CCM is also connected to the programmer. You'll have to back-probe some of the interconnect wires to see where the fault originates. At least it's a hard fault - everything I get hit with are intermittents - but my guess is the programmer.

Re: Blower running at 1 speed
 

I have a 96 C4 parts car there in Farmington at Corvette Recycling. You can try both parts and then buy the one you need....

Re: Blower running at 1 speed
 

That sounds like my best option. PM me and I will make arrangement on getting parts!
You guys are the best:handshak:

Re: Blower running at 1 speed
 

Nice of you Ron! Not sure if the programmer will work however I think the head unit is the same. GC

Re: Blower running at 1 speed
 

Sent...