TA In Progress Posted December 14, 2010 Report Share Posted December 14, 2010 Just as the title says, when I have the blower on the speed is not constant, especially at the higher speeds. Everything else in the HVAC works as advertised and the blower works on all speed settings, but it surges. I'm thinking it's the blower control module under the dash, but was wondering if anyone had any experience with this on a similar GM before. Thanks for the help! Quote Link to comment Share on other sites More sharing options...
acklac7 Posted December 14, 2010 Report Share Posted December 14, 2010 Just as the title says, when I have the blower on the speed is not constant, especially at the higher speeds. Everything else in the HVAC works as advertised and the blower works on all speed settings, but it surges. I'm thinking it's the blower control module under the dash, but was wondering if anyone had any experience with this on a similar GM before. Thanks for the help! Sounds like a resistor is going bad, or the motor itself is failing and drawing to many amps. Quote Link to comment Share on other sites More sharing options...
AJ Posted December 14, 2010 Report Share Posted December 14, 2010 Sounds like a resistor is going bad, or the motor itself is failing and drawing to many amps. doesn't have a resistor. sounds like it needs a blower motor control processor. its hard to test because GM doesn't have a test for something like a surge. its basically testing with a part and its either try the processor or the head control module. Quote Link to comment Share on other sites More sharing options...
acklac7 Posted December 14, 2010 Report Share Posted December 14, 2010 doesn't have a resistor. sounds like it needs a blower motor control processor. its hard to test because GM doesn't have a test for something like a surge. its basically testing with a part and its either try the processor or the head control module. so the blower motor speed is controlled by its own microchip?...Interesting. (Don't most Caddy's use the same technology?) *has a theory on the source of the problem* Quote Link to comment Share on other sites More sharing options...
AJ Posted December 14, 2010 Report Share Posted December 14, 2010 depends on the car. Quote Link to comment Share on other sites More sharing options...
acklac7 Posted December 14, 2010 Report Share Posted December 14, 2010 (edited) Now that you mention it I believe most Cadillac blower motors are controlled by a microchip within the motor. If ignition wires contact the blower motor (or even come close) the interference can severally affect the motor's operation (and often times lead to it's failure). Not sure if the blower motor is located near the ignition wires on an '04 Impala but it's def. something worth looking into. Edited December 14, 2010 by acklac7 Quote Link to comment Share on other sites More sharing options...
AJ Posted December 14, 2010 Report Share Posted December 14, 2010 not even close to it, about 3 feet away. your thinking old 90's technology anyways. Quote Link to comment Share on other sites More sharing options...
acklac7 Posted December 14, 2010 Report Share Posted December 14, 2010 your thinking old 90's technology anyways. Correct. *needs to lurk-moar* Quote Link to comment Share on other sites More sharing options...
AJ Posted December 14, 2010 Report Share Posted December 14, 2010 *needs to lurk-moar* Correct. lol, sorry had to do it. Quote Link to comment Share on other sites More sharing options...
acklac7 Posted December 14, 2010 Report Share Posted December 14, 2010 (edited) lol, sorry had to do it. s'all good, I welcome ownage as long as it's presented in a constructive way - *puts on the white collar* Edited December 14, 2010 by acklac7 Quote Link to comment Share on other sites More sharing options...
TA In Progress Posted December 14, 2010 Author Report Share Posted December 14, 2010 doesn't have a resistor. sounds like it needs a blower motor control processor. its hard to test because GM doesn't have a test for something like a surge. its basically testing with a part and its either try the processor or the head control module. Thanks man, this reinforces what I had in mind. The blower control module is considerably cheaper also, so I'll try that first. Quote Link to comment Share on other sites More sharing options...
TA In Progress Posted December 14, 2010 Author Report Share Posted December 14, 2010 Now that you mention it I believe most Cadillac blower motors are controlled by a microchip within the motor. If ignition wires contact the blower motor (or even come close) the interference can severally affect the motor's operation (and often times lead to it's failure). Not sure if the blower motor is located near the ignition wires on an '04 Impala but it's def. something worth looking into. Blower is under the dash. Quote Link to comment Share on other sites More sharing options...
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