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Yukon XL 1500

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Question
Vents blowing cold Air. Heat inop.
Hey there: If your engine is not overheating and you've flushed the core and coolant correctly, it's possible that you may have an electrical issue causing the heater to not function correctly. I'd start by checking fuses and relays powering...
Question
Knocking on the right rear wheel
Hello, thank you for writing in. The vehicle will need to be inspected further at this point. The sound may be coming from the tire, the hub assembly, the brakes, or the suspension. With that being said, a trained eye...
Question
Truck sounds very loud when I step on gas...maybe muffler? 2007 GMC Yukon
Hello - this new, louder sound level could be the muffler, catalytic converter, an exhaust gasket or one of the connecting exhaust pipe(s). I would recommend having an exhaust system inspection by a mobile, professional mechanic, such as one from...
Question
No front or rear license tag park lamps
Hey there. Any lights that are dark may be caused by bad wiring or a number of other issues. You are doing good to work through the circuit in your search. Under the conduit may be corrosion or a broken...
Question
Driver side headlights are dim. When I flash brights, the engine dies.
Hi and thanks for contacting YourMechanic. First check the battery cables for a clean and corrosion free contact. If the battery is good, then there is a problem with the wiring in the steering column. There is a short crossing...
Question
Instrument cluster acts like there is a short in it.
Hi there. There are ground wires in the dash that need to be checked that are related to the instrument panel. See if the ground wires are tight and free of corrosion. Then check the battery cables for that they...
Question
Gas pump keeps shutting off. I've replaced the charcoal canister also the valve and still won't work
This is likely related to your EVAP emissions system and something called a purge valve solenoid. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel...
Question
Radiator fan running max frequently
The fan circuit has a relay, switch contacts, and a temperature sensor. There may be other circuit components as well. If the fan is coming on when it is not supposed to, there is a fault in one or more...
Question
Engine in limp mode-- transmission has been checked and found to be fine. 2002 GMC Yukon XL
Hi there - the first task for a "limp mode" warning is to check for problem codes, even if they are intermittent, and whether the Check Engine light is on or not. Find out what is causing the Low Coolant...
Question
I hit a curb pretty hard.. 5 to 10 minutes later my traction control light and my reduce engine power light came on.. Now ive cha
Any fault/error (or damage to the vehicle) that will affect drivability or vehicle performance "can" cause reduced power. Consequently, the codes that have caused the traction control warning light to illuminate should first be downloaded and if those codes implicate...
Question
Service park assist is displaying on dash
Hello, and thank you for writing in. Your vehicle is equipped with the Park Assist feature which will help you park in difficult situations. When the computer system detects there is an issue, the warning light illuminates to let you...
Question
How to tell if my Yukon has active brake control or not?
If you have a traction control switch to turn traction control on and off then you do not have active brake control. If you do not have the switch then you should be equipped with active brake control.
Question
Can bad front wheel bearings cause 2007 gmc yukon to slip out of 2 wheel drive into 4 wheel drive and slip back again?
Bad wheel bearings can cause the front wheel sensors to not register correct wheel turning rotations and cause sensor fault codes and even faults in 4x4 and ABS systems.
Question
Engine overheating gmc Yukon xl with ac on. Already replaced head gaskets, thermostat, flushed system. Good on correct coolant.
Hi Laci. Thanks for contacting us today. When the AC is turned on, it will create more strain put on the engine, causing existing small problems to accelerate. There are a few things that could be causing this problem such...
Question
The rpm in my truck is high while I'm in first gear then drops to normal once i accelerate
Hi Michael. Thanks for contacting us today. A high idle speed while not in gear is often caused by a faulty idle control valve or vacuum leak. It would probably be best to have a mechanic diagnose this issue correctly...
Question
Belt squeal increases with speed
Hi there. Usually when a belt makes the squealing sound which increases in pitch and volume with the increase in engine RPM it is due to one of two things. First, the belt may not be properly tightened or is...
Question
pads are 2mm on 2014 yukon xl denali with 52000 miles...all works good...incidental finding...do I replace now? Pads and rotors? o
At 2mm, the pads are definitely due for replacement. The the thickness of the brake rotors should be measured and compared to the minimum thickness specifications. If they measure above the specs and there is enough thickness to them, resurfacing...
Question
My car does not pick up like it use to in any gear
The problem sounds like you either have low fuel pressure or have a clogged fuel filter. have the fuel pressure checked and if it is good the try replacing the fuel filter to see if this fixes the problem. Also...
Question
whining noise front of engine, EVAP and temperature control
Hello, thank you for writing in. The first two symptoms may be related. Finding a leak in the EVAP system will take some time and focus. If the noise goes away after fixing the leak, then we know we can...
Question
What damage could uninstalling my ABS system do to my 2005 GMC Yukon XL 1500 RWD 5.3L flex fuel
Modifications to vehicle brakes is not something we can help you with due to safety reasons. I can tell you that if the ABS is not active or does not work then the brakes will revert to normal brakes as...

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