The heater works (heat is there just not blowing out). I have checked all of the fuses, that I could find. There is suppose to be a specific fuse/relay box in the engine compartment next to the large Fuse box. Anyone know where that is specifically? Or is that even the problem? Could the fan be burned up? Just seeing if it is something that we could do ourselves. Thanks
Motor brushes may be worn out.
SOURCE: 1997 Gmc yukon fuel relay switch continues to burn out
I would have to check the fuel pump with a scope to look at the pattern and check the amps it is drawing . the grounds need to be checked and the pcm checked and reflashed. on the fuel system that would affect the fuel pump and relay to where it would burn it out is grounds , pcm , fuel pump , fuel pump relay. so you should convince them to replace the fuel pump and fuel pump relay under warranty and replace the pcm . and get a diagram and check all grounds. If the pcm is damaged and the current has been affected and instead of say a 5 volt or 2 volt signal it now has a 13.5 volt signal or if a ground is out then the temp of the relay will keep rising non energized a relay is about 99 energized it is around 140 you can check to see how hot that relay is getting. and if i remember correctly you want the pcm drivers checked.
SOURCE: ecm fuse keeps blowing
just fixed this problem, change your fuel pump module, fuel sending unit shorts out on fuel level swing arm blue wire... unfortinately you must replace it as unit because of the design, fuel pump and tank guage fuel level sending unit are a one peice item, fuel tank has to come out to change unit, about a $ 700.00 repair too... fuel pump module runs about 350 to 700 $ depending on aftermarket or factory, try to find one with a lifetime warranty even if it is $ 50.00 more worth it..labor is about $ 250 to $ 400 depending on shop labor rate... definate problem though I ahve no doubt, common problem on GM... please rate my help, thanks...
SOURCE: 2003 GMC Yukon - fuel pump
Check your ECM fuse. There should be 2 fuses for your ECM. It's the ECM that controls the function of the fuel pump. Good luck friend and it's also common for the wire harness from the frame to the fuel pump to go bad due to corrosion from the bad weather we get in the winter and rainy spring and fall.
SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.
Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."
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