Mechanics

GMC YUKON 134A PROBLEM

2001 GMC Yukon

I have a 2001 GMC Yukon with 90,000 miles.

A couple of weeks ago, the truck started but instantly cut off by
itself
as if it wasn't getting enough gas or something. I had to start it
thrice before it stayed started.

Also, I put the driver side window down (power-windows) and it wouldn't
come back up. I cut the truck off, waited for about 15 minutes and it
worked this time.

One other peculiar thing was that one day when I cut the truck off, the
radio, which will usually continue to play unitl I open the door,
instantly cut off and then this week as I was driving (the startup
lights in the dash came on as if the motor was being turned off), the
truck jolted a bit and then it kept going. This happened about a
half-hour or so later again before I got home and parked it.

Thanks in advance for any help you can give.
Avatar
Andrew24
June 30, 2006.



Is your A/C system a 134a or R12? If its a 134a system, you have to remember that the pressure temperature relationship between the two different refrigerants is quite different. For example, on a 134a system, an evaporator pressure of let's say 35-40# will net you a suction temp of40-45 degrees. While an increase to 50# will get your suction temp to approx.54 degrees.

On the other hand, the old r12 has a much better capacity. The same scenarios: 28-32# nets you a 30-35 degree suction temp. At 40#- 45 degrees.

For an indepth look at the real differences go to http://www.refrigerants.com/catalog.pdf

Tiny
Tygerof2
Sep 3, 2006.