Question about 1996 GMC Yukon
YOUR HEATER CORE IS STOPPED UP. YOU CAN TRY HAVING THE COOLING SYSTEM POWER FLUSHED. BUT I HAVE HAD LIMITED SUCCESS WITH THIS.THESE TRUCKS HAVE A PROBLEM WITH THE SYSTEMS CLOGGING. AFTER YOU HAVE IT FLUSHED DO NOT REFILL WITH DEXCOOL. THAT WAS ONE OF GM GREAT IDEARS THAT IS NOT GOOD THE STUFF IS CORRISER. REFILL WITH REGULER GOOD OLE GREEN ANTI FREEZE WITH A50/50 MIX HOPE THIS HELPS BILL
Posted on Dec 11, 2012
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Posted on Jan 02, 2017
yes it could be. you should look under the dash if possible and see if you see the levers for the doors switching.You may possibly have a weak actuator.
Posted on Nov 11, 2009
on some GMC models there is a valve that opens when you turn on the heat inside. It is called a heater control / actuator valve, it works off engine vacuum thru hoses connected under the dash, and going to the top of the valve. Now junk and crud and old rust will get in the valve and restrict it's flow. You will have to pull the valve off and clean it, but it is best to replace it, seeing it is hard to get all the junk out of it.
It looks like a L shape pipe with a hose on top & bottom, black plastic,and a smaller line on top mounted close to the wheel well about even with the exhaust manifold on the pass side. Drain the coolant, remove the valve and see if this is the cause, lots of gunk in the one hose. It is not real hard not real easy to replace this valve. Now if your truck does not have this valve check the pipe that the hose hooks to on top of the engine, remove the hose and see if a small screw driver will go down inside or if it is stopped up. .
Posted on Dec 07, 2009
This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump into my heater core and hook to the pump. I bought some radiator cleaner at Auto Zone and put it in a 5 gallon pail with about 2 gallons of hot water.I pumped the cleaner from the pail into the OUTLET side of the heater core.(By going in the outlet side you are back flushing the core.) I put an old cloth over the top of the bucket and let the outcoming cleaner run onto this cloth acting as a filter for the dirt coming out of the heater core and let the pump run about 10 minutes. Believe me,A LOT!!!!!!!!!!! of dirt,rust etc. came out of my heater core. The heat now works excellent! Good luck.
Posted on Jan 29, 2010
SOURCE: heater blows cold
ok there is a few things might be happening...first did you make sure when you put the intake gaskets in there was No ports plugged or covered...second is...are both heater hoses Cold or is one hot and other cold...if so you have a air lock in the heater core...if this is the problem you need to lossen off the cold one till antifrezze comes out.
Posted on Mar 06, 2010
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