Question about 1999 GMC Yukon
Do you have rear heat and a/c if so your heater core is leaking or one of the coolant lines to the rear heater are leaking. if coming from a drain its the heater core. Look under and see what its coming from. The lines need a special tool to get off J38723 is the number for the tool not mater which its leaking you need the tool to get the lines off. The lines run under from front to back, the heater core is inside the quarter trim panel and in a case that you take apart the Rt. inner wheel house also has to be removed for the lines that is where they connect to the heater core.
Posted on Feb 18, 2015
I don't understand the question..are you talking about a film on the back bumper, a puddle on the ground, or liquid pooling in the cargo area?...
Posted on Feb 09, 2015
What do you mean "antifreeze is blowing in the back of the truck", that is not clear at all.
I’m happy to assist further over the phone at https://www.6ya.com/expert/josh_8f8ad0a8f7e0e6d3
Posted on Feb 09, 2015
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Fill the tank with the CORRECT antifreeze up to the fill line (There should be two lines - a "Hot" and a "Cold"). Find out where you are losing your antifreeze - look for a puddle under the vehicle after you fill it. If no puddle, run until the vehicle is warm, shut it down, and look for a puddle.
If your cooling system was empty, you may have to bleed the system after filling the tank. A shop manual for the vehicle should tell you whether you have to bleed the system.
Posted on Dec 11, 2012
Tips for a great answer:
Nov 18, 2015 | GMC Cars & Trucks
Feb 04, 2015 | 1998 GMC Yukon
Nov 22, 2011 | 2003 GMC Yukon Denali
Feb 25, 2011 | 2003 Chevrolet Tahoe
Nov 11, 2010 | 1999 GMC Yukon
Dec 13, 2017 | 2005 GMC Yukon Xl Denali
Sep 13, 2009 | 1999 GMC Yukon
Jan 26, 2009 | 2002 GMC Yukon XL
Jun 09, 2008 | 1999 GMC Yukon
Dec 11, 2016 | 1999 GMC Yukon
74 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: