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04 GMC Envoy XLT- Heat/a/c fan won't adjust levels and stays on when vehicle has been turned off.Can this be fixed by replacing fuses or is it a switch failure? Thanks for any help!

2nd issue-Emergency flashers turn on every time I pump gas with vehicle turned off & they turn off when starting vehicle.

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Posted on Jan 02, 2017

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SOURCE: 2004 GMC Envoy XL Loss of power

I also have an '04 Envoy XL. The problem we had was very similar. The truck lost power and the wife and kids were stuck on the interstate. It was the catalytic converter totally clogged. We were told by our trusted mechanic that we were lucky not to have blown a head gasket from the back pressure. Two days after having the converter replaced the check engine light came on. I went to Autozone to have the codes read. I don't remember the code number but it was basically that the thermostat was stuck open and the engine was running too cool causing it to run rich and clog the converter. I did not get a light until after and the light went out on it's own. I hope this helps you. GOOD LUCK!

Posted on Jul 07, 2008

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SOURCE: Chevy S10 Tail Light issue

CHEVY S-10 TAIL LIGHTS PROBLEM RESOLVED...It seems Chevy engineered a ground shorting clip located under the left rear bumper area. It looks like a connector for trailer wiring harness, but in actuallity is a metal shorting clip which ties 5 wires together. They are all the ground wires for the tail lights. Then one single small wire runs to ground completeing the circuit. Problem is that this one wire is not tough enough to be a strain relief for the grounding plug and over time the ground wire wears, leaving intermittent lighting problems. FIX IS TO SPLICE THE GROUND WIRE INTO ONE OF THE FIVE OTHER WIRES AND USE PLASTIC TY WRAP FOR STRAIN RELIEF. This fixes no tail lights, intermittent rear signals, and other significant problems. I just got done making this same repair on a 2000 s-10 and everything works fine. Since it is the strain on the single ground wire connected to the connector that leads to failure, it is best to tie a new ground or clip the ground wire coming out of the plug and resplice it into one of the other five wires. Does not matter which one since electrically it makes no difference; they are all gound wires. BUT only one wire completes the connection and that is the problem. Really good engineering Chevy! The location is under left rear of bed in wiring harness right before the split. The connector is blue or green. Take the cover off to see the metal shorting clip. Also note the ground wire coming out of the plug/connector and runs about 8 inches to frame. If this is not hooked up you will have tail light issues. If you register on Autozone .com you can access wiring schematics for free. BL

Posted on May 16, 2009

  • 4 Answers

SOURCE: 1997 Chevy Tahoe both turn signals stopped working

Sounds like the flasher unit to me. Normally the emergency flasher and turn signal are separate.

Posted on Jul 21, 2009

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SOURCE: 93 gmc sierra 5.7 liter engine, injection carb,

you say you replaced the fuse, but does the fuse have power? the gray wire at pump should have power when cranking, or for 2 seconds when turning key on. At fuel pump relay, put power onto gray wire, the pump should run if the wiring is good. if it doenst run then ck for power at fuse while power is on gray wire.

Posted on Oct 19, 2009

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SOURCE: Turn signals not working.All bulbs are good,no

The emergency flasher and the turn signal flasher are two separate items. You could have a defective T/S flasher.

Posted on Oct 30, 2009

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