20 Most Recent 2002 GMC Yukon Denali - Page 7 Questions & Answers

Start it cold with rad cap off, and heater on high heat, and let it run until you see increased flow in radiator, indicating thermostat opened & engine reached operating temperature. Rev engine slightly every once in a while and hold it there for 10-20 seconds, just to help purge air better/faster. Watch rad flow again, and wait until you see increased flow 3 or 4 times. Then top up coolant in rad to an inch or 2 from top of rad, and put cap back on. Top up return bottle to appropriate level on bottle & then try it again. If it still heats up, get back to me. Does it overheat at all times? Rad fan is good i take it?

A few things can cause that.. Most likely a vacuum line is pinched or unplugged that is connected to the air controls.

Hello! Accidental short on the cigar lighter or a failure? If it was a failure has the cigar lighter socket been replaced and is OK? If the failure or accidental short on the cigar lighter happened when the fog lamps were on current back fed through the Fog Lamp Relay and may have damaged its contacts...Question then becomes; Is the fog lamp fuse (FOG LPS 15 A) OK...it is in the under hood fuse block..Have you checked the fog lps fuse? if it is good and fog lamps do not come on replace the Fog Lamp Relay (under hood fuse/relay block)Guru...saailer I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Hello! Here is the diagram of the drive belt for an 8.1L...Guru..saailer I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Hello! Is the Check Engine Light on?...If it is there is a trouble code stored...I'll need that code...Rent, buy or borrow a scanner to plug into the On Board Diagnostic II connector to read the trouble code/codes...Then send the code to me...There are 54 Technical Service Bulletins (TSB) written for your transmission...A TSB is not a Recall but acknowledgement, by the factory, of identified problems...Which means it has a fair amount of trouble...without that code it would be very difficult to define the problem...It may be a simple sensor replacement...guru...Saailer I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Check for vacuum leak at intake or plenumn while it is cold , also check temp sensor. i have done a few intake manifold gaskets on these vehicles.