Heater / Blower Problem
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Heater / Blower Problem
MaximRecoil
wrote...
I took the blower motor out today and it was nearly frozen up (rusty bearings I guess). I removed the rubber plug and put some oil in there, and then fired it up by hooking it directly to a booster pack, and eventually the fan started turning freely. I hooked it back up in the truck and it worked perfectly on all speeds. Fortunately that new resistor I bought was okay even though it overheated yesterday and melted a bit of its plastic plug housing (as I mentioned in a previous post).
What he wrote in the previous post was that his low speed blower / fan settings didn't blow, but a high speed setting worked. That is my problem too.
Others who had that problem or similar blower problems either changed fuses or bad resistors. Regarding that, someone, maybe MaximRecoil, said heat-damaged resistors were symptoms of blower-motor problems, not causes.
Therefore, I think the right solution would be:
1. First check the blower resistor for signs of heat damage. If signs of heat damage are found, buy a new resistor.
2. Then, do what MaximRecoil said to do: "remove the blower motor, remove the rubber plug and put some oil in there, reinstall and see if it works". (Probably he replaced the damaged resistor, too.)
3. If that fix fails, replace the blower moter.
Does that sound right? Someone told MaximRecoil that the blower motor would fail eventually so he should replace it with a new blower motor rather than rely on the old oiled motor to carry on working.
MaximRecoil declined to do that, because the fix was already in and he thought he was good...but he didn't report back to say how long his service solution continued to work. Obviously if a cranky blower motor is oiled, then works fine for a few weeks, then goes bad again, no need to oil it and hope for the best, just buy and install a new motor.
Here's what the service manual says:
Possible causes of an inoperative blower motor include:
Faulty fuse
Faulty blower motor circuit wiring or wire harness connectors
Faulty blower motor resistor
Faulty blower motor relay
Faulty voltage reduction relay
Faulty blower motor switch
Faulty heater-A/C mode control switch
Faulty blower motor.
Possible causes of the blower motor not operating in all speeds include
Faulty fuse
Faulty blower motor switch
Faulty blower motor resistor
Faulty blower motor relay
Faulty blower motor circuit wiring or wire harness connectors.
Notable in all of that is someone, maybe MaximRecoil, said heat-damaged resistors were symptoms of blower-motor problems, not causes. Not withstanding MaximRecoil's experience and advice, if you look at the list of possible faults, Faulty blower motor is not supposed to be a cause of a blower motor that doesn't operate in all speeds.
wrote...
I took the blower motor out today and it was nearly frozen up (rusty bearings I guess). I removed the rubber plug and put some oil in there, and then fired it up by hooking it directly to a booster pack, and eventually the fan started turning freely. I hooked it back up in the truck and it worked perfectly on all speeds. Fortunately that new resistor I bought was okay even though it overheated yesterday and melted a bit of its plastic plug housing (as I mentioned in a previous post).
What he wrote in the previous post was that his low speed blower / fan settings didn't blow, but a high speed setting worked. That is my problem too.
Others who had that problem or similar blower problems either changed fuses or bad resistors. Regarding that, someone, maybe MaximRecoil, said heat-damaged resistors were symptoms of blower-motor problems, not causes.
Therefore, I think the right solution would be:
1. First check the blower resistor for signs of heat damage. If signs of heat damage are found, buy a new resistor.
2. Then, do what MaximRecoil said to do: "remove the blower motor, remove the rubber plug and put some oil in there, reinstall and see if it works". (Probably he replaced the damaged resistor, too.)
3. If that fix fails, replace the blower moter.
Does that sound right? Someone told MaximRecoil that the blower motor would fail eventually so he should replace it with a new blower motor rather than rely on the old oiled motor to carry on working.
MaximRecoil declined to do that, because the fix was already in and he thought he was good...but he didn't report back to say how long his service solution continued to work. Obviously if a cranky blower motor is oiled, then works fine for a few weeks, then goes bad again, no need to oil it and hope for the best, just buy and install a new motor.
Here's what the service manual says:
Possible causes of an inoperative blower motor include:
Faulty fuse
Faulty blower motor circuit wiring or wire harness connectors
Faulty blower motor resistor
Faulty blower motor relay
Faulty voltage reduction relay
Faulty blower motor switch
Faulty heater-A/C mode control switch
Faulty blower motor.
Possible causes of the blower motor not operating in all speeds include
Faulty fuse
Faulty blower motor switch
Faulty blower motor resistor
Faulty blower motor relay
Faulty blower motor circuit wiring or wire harness connectors.
Notable in all of that is someone, maybe MaximRecoil, said heat-damaged resistors were symptoms of blower-motor problems, not causes. Not withstanding MaximRecoil's experience and advice, if you look at the list of possible faults, Faulty blower motor is not supposed to be a cause of a blower motor that doesn't operate in all speeds.
Last edited by dubina; Jan 23, 2013 at 07:22 PM.
