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If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.
Hi, hope the folowwing will help i found on internet if not email me at firstname.lastname@example.org. My service manual say its in the upper leftside of the heaterbox. remove lower left dash trim panel (drivers) and pull out resistor pack.
Fixing BMW E36 Blower Fan Speed . . . DIY! It has been two weeks since my blower fan stopped working correctly on the low speed options (1, 2 and 3 ). It only works on high speed (Option 4). At first, I thought that the problem was in the fan speed switch because I’ve seen this problem before and when I told my electrician about it, he disassembled the switch and tried to clean it. Of course this solution didn’t work. So, I’ve decided to dig for the solution myself and I found that this is a pretty common problem among E36 cars. The problem is that speed 1, 2 and 3 are controlled by something called (Final Stage Unit on digital climate control units, Blower Resistor Pack on analog climate control units). The 4th speed is actually uncontrolled, so, it simply bypasses the final stage or resistor pack units. That explains why the fan works on the 4th speed and not the other lower speed options. Anyway, I tried to find a DIY (Do It Yourself) procedure on how to fix this problem and I found one that was written by "Deem3" on bimmerforums (thank you Deem3 for the great write-up). Now take a look below. It’s a really simple procedure. I will be trying it this weekend to see how it goes. I will post more details about this job soon.
Symptoms (2 cases): - Digital Climate Control: All the lights on your digital climate control are working and the buttons respond but the blower doesn’t blow any air. - Analog Climate Control: The blower doesn’t work except on the highest speed (4th position).To replace it, we need to take off the driver’s side knee bolster. This only requires you to remove two screws,one on the right side of the bolster and one on the left. Using the phillips screwdriver remove the following screws. Now remove the speaker and footwell light. Using the 10mm socket remove the 3 bolts holding the metal shield. And using the phillips screwdriver remove the obd2 port. Now you should be able to see the footwell air duct. Remove it by pulling it. With everything out of the way you should now be able to see the defective final stage unit. Remove it using the torx-20 screw driver. Replace it with the new part and before you put everything back turn on your car and test the blower. If everything is ok proceed to put everything back, and enjoy the benefits of having a blower in your car again. .
Per your description, I believe you may have a blower fan relay that is stuck closed. Remove the relay from the under-hood fuse center and see if the fan stops. If it does stop, put the relay in slowly and see if you here the relay "click" and the fan come back on. Let me know. Regards,
Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.
under the dash on the duct work for the air.. you will find a connector that goes into it... two or three screws will remove the item.... i call it a resister block... basically the switch allows different resisters to be be switched into the power line to the fan... that gives you different speeds... just take it to a parts store and they will be able to get one for you.... or a mazda dealer if you don't mind spending more.