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You'll find the heater blower motor resistor in the heater/air conditioner compartment. This compartment is location underneath the dashboard. This is the part that allows the heater blower motor to change the fan's speed.
You will have a bad blower resister and the part will be around $124.80 dollars.........
the heater blower resistor is bad. located on firewall under heater hoses two 8mm bolts. about a twenty dollar motorcraft part. easy repair.
The blower motor speed resistor is burned out. That part is available from your local auto parts store.
If a 2000 Grand Am sometimes has the heater blower working and sometimes it won't, the problem could be with the heater relay switch. The heater relay switch lets the heater blower know when to come on and when to go off. In most vehicles this switch is behind the glove compartment. This part sometimes gets corroded from condensation in this area.
You can find a heater blower motor wiring diagram for a 1978 El Camino is the owner's manual. You can also find it at specific auto part stores.
This is a simple do it yourself job. First you need to locate you blower motor heater which should be under the dashboard passenger side, you might have to remove a peice of trim. There should be three screws that will remove it. It should come out in one peice and you have to remove the fan blade that looks like hamster wheel. Buy new part ( bring old part in to ensure you have the right one) install new part buy plugging the blower motor in and reinstall ( You might have two blade into the adapter from you old motor) enjoy the heat, and tell everyone where exactly you blower motor is, p.s take lots of pictures so you have a reference when reinstalling
under dash, passenger side, by heater blower, supposed to be an easy fix. Held on by 1 clip and 2 screws try Rockauto.com airtex Part#4P1402 supossed to have a good picture to look at so you know what your looking for.
Probably the blower motor resistor is fried. New ones from Dodge dealer are usually about $20 for the part. A very cheap and easy DIY fix.
Your heater core is leaking. This is the part of your car that creates heat for the passenger compartment of your car. There is no fix for a leaking heater core except to replace it.
Im trying to figure out how to replace my heater modual in my 2006 gmc, I have the part just need a diagram of where exactly it is located in my truck.
Could be: Bad resistor Bad low speed relay Bad switch One winding in blower motor bad (has 2) Replace the blower motor resistor -$15 part - located under passenger side on heater core - takes 10 minutes DIY - or pay a mechanic $150, your choice.