Engine Size: 5.9
Refrigerant Type: R-134A
Ambient Temp: low 80s
Pressure Low: 20
Pressure High: 235
Country of Origin: United States
I am having a strange issue with this vehicle. It is giving approximately 52ÃÂ°F at the center vent at 1500 RPM.
Given the low side, I tried adding refrigerant After adding a few ounces, the compressor would start to cycle quickly then absolutely nothing.
After evacuating a small amount, performance would return to where it was initially. It's like it just wont take anything, and the measurements tell me it needs a more
refrigerant to get the output into the low 40's.
Any help would be appreciated!
First things first, you have to know you have the correct charge level. Reclaim - pull a vacuum - recharge to OEM specifications. Adding a little here and removing a little there just makes a mess of things when trying to diagnose a system.
Compressor Type Sanden SD-7H15 7-Cyl.
Refrigerant (R-134a) Capacity
With Rear A/C Unit 30 ozs.
Without Rear A/C Unit 28 ozs.
With Rear A/C Unit 8.0 ozs.
Without Rear A/C Unit (4.7L) 5.5 ozs.
Without Rear A/C Unit (5.9L) 6.1 ozs.
System Operating Pressures
High Side 135-185 psi (9.5-13.0kg/cm2 )
Low Side 20-30 psi (1.4-2.1 kg/cm2 )
Measured at ambient air temperature of 80ÃÂ°F (27ÃÂ°C).
Thanks TRB. I suppose you can't always top them off.
Edited: Sat August 23, 2008 at 11:30 PM by Mattb
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