rear expansion valve on gmc yukon ac? how do i find it?

3 ANSWERS

1. Guest3817
   

   I am going through the same process, replaced compressor, orfice, accum. I can not find the expansion valve, any help would be greatly appreciated

   Report (0) (0)  |   12 years, 8 month(s) ago  

2. Guest9430
   

   I found the following on some website during my hunt for a solution to the same symptoms.  Sounds like LOTS of remove/replace to get at the thing:
   
   
   The Expansion valve is located in the Right rear of the Yukon. The interior panels will need to come off to be able to reach the heating and air unit that the expansion valve is located in. Most of the panels have push in clips. I have a cool panel removing tool that slides in and you squeeze and it pops the clips out. Then you need to seperate the airbox ( There are lots of clips and a few screws, some of the screws are in recessed holes) so make sure you have them all out . I had to unbolt the whole box to reach one s***w that was located at the lower front near the wheel well. I did NOT have to disconnect the heater hoses from underneath to switch the valve. but the AC lines underneath of course needs to be disconnnected. it's best to pressure wash under your Yukon in the area underneath that you will be disconnecting the lines from as to not let any dirt and debri contaminate your ac lines. Also check and make sure your air doors are properly working while you have the unit exposed, This is easy to do their are two electric motor control actuators on the AC unit, Switch the heat control from hot to cold etc and the up and down controls from the drivers comp ( For the Rear Air and heat) and make sure their doing their job. The expansion valve is just below the blower motor. I took off alot of the components ( Like the electric actuators, blower motor and also slid out the heater core to be able to get the air box seperated) also you will need to be patient with reassembly as the doors that the electric acuators operate will need to be lined back up so everything goes back together right. I was able to slide the whole evaporator out and the expansion valve is mounted on it. I flushed the evaporator out when I had it out.
   This is quite a job but if you have some decent basic mechanical abilty you should be able to do it and save a ton of money.

   Report (0) (0)  |   12 years, 8 month(s) ago  

3. Guest7350
   

   I just did mine on a 2003 tahoe, was not a issue at all. I didn't have to take off half of what the guy above said. Pretty simple straight forward.

   Report (0) (0)  |   12 years, 8 month(s) ago