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My 944 is an 86. The blower will not come on at any of the 4 positions. It will not come with any of the adjustments in any position. I can hear all the motors working when the sliders are moved. Something starts up and runs a little when I press the defrost button. I checked all the fuses and they are good. I swapped in a few relays. Is there any way to confirm the blower is bad with a meter? Any other way to trouble shoot?
OK, educate me. I know vinegar is an acid so I guess you want to soak the resister pack in a mild acid. What is the problem with the resister pack that this solves? As I recall, it's a fairly normal high amperage ceramic resister element.
Personally, I would check for 12 volts at the connector for the blower motor and make a decision based on that. Also confirm your ground path.
On my 944R project, it was missing the blower motor entirely. I found a new motor on Ebay for about $30. I was skeptical but it was a perfect fit. I think the blower motor is used in some more main stream cars (VW?) which is why it was so cheap. This was on an 84.
OK, educate me. I know vinegar is an acid so I guess you want to soak the resister pack in a mild acid. What is the problem with the resister pack that this solves? As I recall, it's a fairly normal high amperage ceramic resister element....
Its a very common fix on 944’s, if I had time I’d search for past posts about it for you. The resistor pack sits on the blower and iirc contains 4 exposed coil resistors that instantly benefit from a dip in vinegar. I’ve done it myself on all my cars, it just works likely due to the deep cleaning vinegar provides.
Edit: here’s one past thread amongst many about it: Fan Blower Fix (post #9 summarizes).
OK, I checked a few threads and see that we are not cleaning the resisters per se, we are cleaning the contacts for the plug and/or the relay type contacts for the thermal overload device. Makes sense now. Thanks.
OK, I checked a few threads and see that we are not cleaning the resisters per se, we are cleaning the contacts for the plug and/or the relay type contacts for the thermal overload device. Makes sense now. Thanks.
I think you have this confused with the coolant fan resistors, we are taking about the blower fan resistors here and it is the resistors that are cleaned.
Yessir, you confused me when you mentioned “ceramic” in your first post and it NOT being about cleaning the resistors.
What happens is those resistor coils came with a black protective coating from the factory which eventually gives up. The black stuff gunks up between the resistor coils and causes the thermal overload relays to trip. If you use a few wooden toothpicks to separate the resistor coils and soak in vinegar it cleans everything up and it won’t overheat anymore. Btw, cleaning the contacts is also a consequence of using the vinegar but simply cleaning the contacts alone (or reseating the connector) isn’t usually a permanent fix, whereas the vinegar generally is.
Well, I was confused! Was thinking about the round white ceramic resisters. But after looking this Pelican "how to" article it is clearer to me. Just guessing but if the OP has no fan at all, I would think the thermal overload relay would be a prime candidate. And I would still want to check to make sure 12V is getting to the fan, just to make sure there is not an "upstream" problem electrically.
Thanks.
OP here. I have no fan at all. I do here what sounds like a fan engage when I press the defrost button and will verify. I will check for 12V as suggested above and get my vinegar out.
Since the early and late blower motors are different, where would these resistors be located in an early ('83) model car? Also I have a problem in locating the radiator cooling fan resistors under the dash for this car as well. Any help would be welcome. Thanks..
Since the early and late blower motors are different, where would these resistors be located in an early ('83) model car? Also I have a problem in locating the radiator cooling fan resistors under the dash for this car as well.
Not sure where the blower motor resistor pack was fitted on an early car, but the ceramic puck for the [single] radiator fan should be mounted to a bracket in the engine compartment, next to the battery, behind the vacuum canister.
06-10-2019, 08:11 PM
Has my blower motor failed?
