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Re: heater only works on high
There is a small electronic controller located in the heater core exterior, on gm's these go out, If you handy with a solder gun, generally it will be a burned lan on the circuit board, these put out quite a bit of heat, that is why it is mounter near the blower.
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There are 2 relays for the blower. The low blower relay and the high blower relay. They are both located
under the hood in the center of the firewall.
The low will have 4 wires from it, one lt. blue and 3 brown. The high will have 5 wires 1 purple(to blower mtr.) 1 black 1 dk blue 1 red and 1 orange.
Also, the blower resistor is in the same area if needed. Hope this helps.
It located behind the dash on the Passenger side.
And yes you can easily do this yourself saving you alot of money! Have you first checked the Front Blower Motor Relay located in the IPM Relay and Fuse Box located inside the engine compartment? Remove the cover. The location identification is located on the back (inside) side of the Cover. You can switch-out a similiar size and shape Relay and check the operation. If the Blower now works then the Relay was bad and needs to be replaced. The Motor and Resistor cost alot more money than the Relay.
Before we do this: What is the Motor doing? Nothing? OR DOES IT WORK ON HIGH ONLY? If the Motor works on High only then it is not the Motor but the Blower (Fan) Motor Resistor. This is located near the Motor. It is identified by 3 to 4 wires going into it. Remove the two (2) retaining nuts/metal screws and remove. Disconnect the wiring connection and replace. I don't want you to replace the Motor and find out you wasted your money when it was the Resistor.
It could be also both the Motor and the Resistor.
Direction to remove/replace the Blower Motor:
1. Disconnect the Negative cable from the Battery and wait two minutes. This is to de-energize the Air Bag System which you will be working near.
2. Remove the Glovebox.
3. Remove the four (4) hex screws holding on the Blower Motor Cover.
4. Remove the three (3) nuts/screws holding in the Blower Motor. Make sure you support the Motor, as it will drop down.
5. Disconnect the electrical connection.
Installation is the reverse of the above.
Check operations before putting the Glove Box Back on.
First: check the Front Blower Motor Relay located in the IPM. Its' location should be on the back side of the cover. There should be an available Spare Relay. Replace and Check operation.
If this does not solve it.
Try the Fan Speed on "high". If the Motor comes on only "high" and no other speed, then it is definitely the Blower (Fan) Motor Resistor and must be replaced. It is located behind the dash Glove Box. Remove the Glove Box. The resistor is located on the back fire wall, and has 3 to 4 wires going into it. It is approximately 3 1/2 inches wide by 1 1/2 inches high. Disconnect the electrical connection. There should be two bolts (I believe 8mm) holding the resistor in place. Remove the bolts and Remove and Replace. Check the operation.
If this does not solve it:
Pull the connection to the Blower Motor and check for Voltage with the Fan On "low". If correct voltage: the Blower Motor itself needs to be replaced.
Let me know if this helped; or if you have additional information or questions. Feel free to contact me at FixYa.com!
My 2005 Vibe did the same thing it was the heater resistor. It is located to on the firewall behind the glove box on the lower left side of the blower assembly. Two 5.5mm screws hold it in place (1/4 inch socket works too). I used a socket attached to a socket swivel to replace mine in under 10 minutes. Heater now works as good as new. I purchase mine online for $30 from rockauto.
I'd check the relay and the resistor ...don't have a location for yours but the resistor is always installed into the heater box so it stays cool. you can usually follow the wiring back to the relay as it's generally nearby. Resistor looks like a piece of circuit board material with several wires connected to it with two screws holding it to the heater box so it sits flush except for the wires. It has several coils inside...any that are broken have failed.
Usually, when the fan works only on high speed the issue is with the blower motor resistor. It will be located under the dash close to the blower motor itself. It will have a multi-wire plug and feeds signal to the blower motor. An updated resistor maybe available in which case a slightly larger hole will have to be cut for the new resistor. This is not a difficult proceedure, only a couple of screws are holding the resistor in place and most resistors are resonably priced. I recommend you buy the resistor at the dealer, this is a case where you get what you pay for.
Good luck, hope this helps.
I had the same problem in my 1994 safari. I thought it mite have been the resistor form other peoples comments. I removed it and tested it. The resistor was fine. The heater fan relay was bad, but I was able to repair it myself. If you remove it and inspect it there should be two contacts that need to make a good connection in order for it to work properly. When the fan is on high there is a little electro magnet that pulls the contact up and engages the fan motor to full speed. When it is not on high the lower part of the contact rests on the lower half of the relay flap. if there is not a clean connection at this location you are not sending signal to the resistor which controls the other three fan speed settings. Inspect this connection and if possible clean the contacts with emery cloth and make sure that the contacts are making a good connection. This should do the trick to make the lower speeds work if the resistor is still good. If this is too much brain damage try replacing the relay first and see what happens, if you are still getting the same result then the resistor or the fan switch is bad.