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You mean the blower motor stops blowing air , the A/C compressor is still engaged ? The temp gauge shouldn't have anything to do with the blower motor .But stranger things have happened on these systems when they are controlled by a electronic module (BCM )
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The ECM sends the temperature data via high speed GMLAN serial data to the body control module (BCM). The BCM then sends the information via low speed GMLAN to the IPC in order to display the engine temperature.
The BCM applies voltage to the blower motor through the HVAC relay. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--4 resistors
• Medium 1 speed--3 resistors
• Medium 2 speed--2 resistors
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit.
Do you know anything about automotive serial data communications ? GMLAN Is general motors version of C.A.N controller area network .
Do you know anything about diagnosing automotive electronics ? Using a digital volt ohm meter ? Using wiring diagrams to pin point locations in a electrical circuit for testing ? Do you know what a factory componet location diagram is ? It takes more then looking at fuse's an relays , to see if current is flowing in a electrical circuit .
http://www.bbbind.com/free_tsb.html Free wiring diagrams ! Enter vehicle info. Year , make , model and engine size ! Under system click on HVAC , under subsystem HVAC Controls . Then click the search button , then click the first blue link . This is the blower motor control diagram . Do you know how to read a wiring diagram ?
Well lets see it just doesn't leak at high speeds . If it leaks it leaks all the time. So I'm gonna recommend you take it to a HVAC technician for two reasons . a) Its dangerous charging systems w/o proper certifications. If you not using a manifold gauge your risking serious physical injury should the equiptment your using burst. b) legally unless your certified to do so you shouldn't (fines are steep)
It sounds like your IAC,idle air control,this unit controls your idle once your choke completally shuts off.on 2.8litre it is located right side of engine just above where your fuel lines go into your manifold ( fuel rails), it's held in by 2 screws &looks like a little electric motor, it's actually a soliniod, inside is a little pinnacle that goes in and out and is controled by the computer.good luck.
If you are looking for the fan blower resistor, it is located behind the glove box. No tools need to get to it and a nut driver to remove the 2 screws to replace it. A 20$ part. It has 2 sets of wires coming off of it. A do it yourself fix.