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GMC Yukon and Yukon Denali Problems

779 messages,  Last post on Oct 31, 2009 at 6:36 AM

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What is this discussion about? GMC Yukon Denali, SUV

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#506 of 779 Re: 06 Denali Headlamp Flickering [jw3591a] by delfina1 Dec 08, 2006 (9:09 pm)
Replying to: jw3591a (Dec 07, 2006 6:54 am) Do you know what the RPM is when the lights are flickering?? Do the dash lights flicker at the same time?? Does the rate of flickering change with a change of RPM?? Have you had starting problems?? Does the engine seem to turn over slower after the vehicle has been off for some time??? Replies to this message: jw3591a (Dec 10, 2006 2:24 pm) delfina1 (Dec 10, 2006 5:41 pm) jw3591a (Dec 15, 2006 2:31 pm) jw3591a (Dec 30, 2006 7:55 pm) warningt (Feb 08, 2007 2:32 pm)
#507 of 779 Re: 06 Denali Headlamp Flickering [delfina1] by jw3591a Dec 10, 2006 (2:24 pm)
Replying to: delfina1 (Dec 08, 2006 9:09 pm) RPM's make no difference. Flicker rate does not change with RPM. Yes, dash lights and all other lights that are illuminated flicker at the same time. Vehicle is new (5K miles) No starting or turnover problems. It doesn't do it when cold. Vehicle has to be operates 10 minutes or more. I'm thinking perhaps the diode trio in the Alternator. Your thoughts? Thanks.. Replies to this message: delfina1 (Dec 10, 2006 5:41 pm) jw3591a (Dec 15, 2006 2:31 pm) jw3591a (Dec 30, 2006 7:55 pm) warningt (Feb 08, 2007 2:32 pm)
#508 of 779 Re: 06 Denali Headlamp Flickering [jw3591a] by delfina1 Dec 10, 2006 (5:41 pm)
Replying to: jw3591a (Dec 10, 2006 2:24 pm) My shade-tree mechanic opinion is that it is not the diodes but rather the voltage regulator. The key is that the flickering does not change with RPM and the added information that it does not flicker when cold. I think you are seeing the voltage regulator turning on and off after you have fully charged the battery and it is just regulating in a "maintaining" mode. If you want to definitize that, throw a load on the battery by doing something like turning on the fan or driving lights while the lights are flickering. I'll bet it changes the rate for a few seconds. If your dealer has some old guy working there I bet he has an old dial voltmeter and he would see the needle move in sync with the flickering you are seeing. The young guys should have something like an oscilloscope to see this. ( He will have to wait until the battery is charged and the regulator is "idling" before he tries this). Hopefully you have not added some 3,000 watt boom box to your electrical system that does massive current draws and GMC won't talk to you. Now for the bad news. Some people are much more sensitive to flickering lights that others. If other people riding with you don't see this flickering, it might just be your sensitivity to differences in light levels. Good luck and let us know how this comes out. Replies to this message: jw3591a (Dec 15, 2006 2:31 pm) jw3591a (Dec 30, 2006 7:55 pm) warningt (Feb 08, 2007 2:32 pm)
#509 of 779 2001 Ykon Denali by chemk Dec 12, 2006 (12:52 pm)
Can anyone tell me where the sensor or relay is that tells the rear pump to pumpup the shocks?   Thanks Pete chemkbellsouth.net
#510 of 779 Heater Defrost Problems by 44magnum Dec 12, 2006 (2:32 pm)
Hi, I have an 05 Yukon Denali XL and I am having problem with the defrost side of the heater. I took it to the dealer and they told me they thought it was a motor. The main blower motor is working fine. The problem is when I change from floor heat (or any of the other settings) to defrost the air will not come through the defrost vents. It also blows cold air on the passenger side and warm on the driver side when all the way on floor heat. I can hear the air flow change when I switch it so to me it does not sound like a motor problem but an adjustment problem. Is there any adjustment on the internal doors of the heater box? I appreciate any help with this. One side note. This was working fine until I took it to the dealer when it was running rough. They said it was an oxygen sensor and replaced it. It helped somewhat but it is still a little rough. As I left the dealer my windows started fogging and this was the first time I noticed the problem. They said it was not related to what they had done and I really can't see how it would be either but then again???? I would appreciate any ideas or help. Thanks in advance.
#511 of 779 Re: 06 Denali Headlamp Flickering [delfina1] by jw3591a Dec 15, 2006 (2:31 pm)
Replying to: delfina1 (Dec 10, 2006 5:41 pm) Hey shade-tree mechanic, As I ponder your diagnosis I think you hit it right on the head. Your explaination make perfect sense. Due to the holidays I probably won't be getting it back to the dealer till after Jan 1. I will, however, let you know the final results when corrected. Thank you very much for your input.
#512 of 779 2004 Yukon Denali Speedometer Problems by hiten Dec 26, 2006 (2:30 pm)
I've got an 2004 Yukon Denali with 60K miles on it and haven't head any major problems. On my trip from Charlotte NC to Chicago IL, my speedometer started having problems. I was doing atleast 75mph and it was registering 0 MPH. Temporary fix was to turn the truck off and wait for few minutes. This would work fine for about 60miles and then the speedometer needle would start going back to 0. Has anyone experienced this problem? All other gauges are working fine. If yes, what was the root cause of the problem? As of rightnow the speedometer is working fine, but I am not sure how long it would last. Thanks in advance! Replies to this message: bct (Dec 26, 2006 3:49 pm)
#513 of 779 Re: 2004 Yukon Denali Speedometer Problems [hiten] by bct Dec 26, 2006 (3:49 pm)
Replying to: hiten (Dec 26, 2006 2:30 pm) Its prob the speed sensor on the tranny. Shouldn't cost too much. I'm not positive bit thats what it sounds like and atleast its a place to start.
#514 of 779 Re: 06 Denali Headlamp Flickering [delfina1] by jw3591a Dec 30, 2006 (7:55 pm)
Replying to: delfina1 (Dec 10, 2006 5:41 pm) Hey Shade Tree. The headlight flickering has stopped. Do you think perhaps the voltage regulator adjusted itself or was sticking from new and has now wore in??? Thanks again!
#515 of 779 Re: [ljackso1] by coachman99 Dec 31, 2006 (6:45 pm)
Replying to: ljackso1 (Mar 04, 2006 8:20 pm) Jackso; My GM dealer told me that with the ALLwheel drive, the two differentials have to have some slack so as not to bind. The clunk is not brakes, but the xmission taking up slack in the shafts conncetion. 25K on it now and is ok pulling 7k pound trailer....coachman99

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