This 2006 GMC Yukon came in with the Service Engine Soon (SES) light on and a code P0449 stored in the PCM memory. This test should be done on the vehicle but I could not figure a way to o the test and position everything for a good picture. So you will just have to … Continue reading “2006 GMC Yukon, P0449”
This 2005 GMC Sierra came in with a poor run condition and multiple misfire codes stored. Code P0304 was one of the misfire codes stored. While looking at data I noted that misfires on cylinder #4 were markedly higher that most of the other cylinders. Normally when confronted with high misfire counts on this engine … Continue reading “2005 GMC Sierra, Multiple Misfires”
This 2005 GMC Sierra came in with the complaint that the speedometer does not work. In fact it was stuck at 55 mph when it was sitting in the shop key on engine off. This repair can apply to any one of up to seven gauges on 2003 through 2007 Classic series Cadillac, Chevrolet and … Continue reading “2005 GMC Sierra, Speedometer Sticks, Replacing Faulty Gauge Stepper Motors”
This 1995 GMC C1500 came in with the complaint that the air would blow from everywhere except the front vents. In using the controls, the air flow would adjust from the defrost to the floor. All other functions were okay as well. The mode actuator is located under the driver’s side of the dash, above … Continue reading “1995 GMC C1500, Air Will Not Blow Out The Vents”
This 2004 GMC Envoy came in with multiple electrical complaints. The main complaint was that it had to jumped started any time the engine was shut off. A quick check found that the battery cables were very loose. After removing the cable ends for inspection an excess amount of corrosion was found. From the way … Continue reading “2004 GMC Envoy No Crank Condition”
This 1997 GMC Savana van has a problem with the blower speed dropping without the switch being moved. The resistor as you can see in the picture below is quite easy to get to. It is under the hood on the passenger side of the vehicle. If you would click on the picture below to … Continue reading “1997 GMC Savana Van, Changing The Blower Resistor”
This 2005 GMC Sierra came in with the complaint that the air will only flow from the defroster vents, regardless of where it is commanded to. This Sierra has auto a/c controls and no floor mounted center console. Of course the customer brought the truck in, knowing that I had to lay under the driver’s … Continue reading “2005 GMC Sierra, Air Blows Only From Defroster Vents”
This 2002 GMC Sierra came in with the complaint that the blower would work sometimes, but now, it would not work at all. This truck has manual HVAC controls so it uses a blower resistor assembly. I do not recommend disconnecting the battery while this work is being done. Instead make sure the ignition remains … Continue reading “2002 GMC Sierra Blower Works Sometimes”
This 2003 GMC Yukon came in with the complaint that the blower was doing weird things. The blower sometimes would not turn off when the ignition was turned off. Also sometimes the blower worked and sometimes it did not. Withe the local temperature expected to top off at over 100 degrees F and the the … Continue reading “2003 GMC Yukon Bower Erratic / Not Working”
This 1998 Chevrolet C1500 came in with a no blower complaint. The starting place for testing is at the blower motor. The blower motor is located behind the passenger side of the dash and is accessed by removing the glove box. After opening the glove box there are two retainers that have to be dealt … Continue reading “1998 Chevrolet C1500, Changing The Blower Motor”