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1998 Durago Compressor bad?

jgcox6 on Wed June 09, 2010 2:36 PM User is offline

Year: 1998
Make: Dodge
Model: Durango
Engine Size: 5.2l
Refrigerant Type: 134a
Pressure Low: 120
Pressure High: 150
Country of Origin: United States

Can you guys tell me if this sounds right....1998 dodge durango blowing hot air. I checked the system with gauges and with the A-C- running and compressor clutch engaged, I read about 120 on low side and about 150 on the high side. System doesn't appear to have any noticable leaks. This particular system apparently has a drier and expansion valve. My thoughts were that the expansion valve was stuck wide open. ???? What do you guys think...

GM Tech on Wed June 09, 2010 3:13 PM User is offline

I think your gage set is wide open.....

Are you sure you have the valves closed and compressor is running --center hub turning?

If you answer affirmative, then your compressor is toast

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

jgcox6 on Wed June 09, 2010 4:17 PM User is offline

the compressor is running and it is engaged...i was thinking that my gauges were closed...and I am assuming that you have to have them closed at that point to measure properly?

So if my gauge valves were open...why would it show that high on the low side...

jgcox6 on Thu June 10, 2010 7:41 AM User is offline

If the compressor is toast...what part of it goes bad? It's able to have a high pressure....I am just wanting to learn more about it...could you explain how it can still have such a high reading on the high side?

GM Tech on Thu June 10, 2010 7:53 AM User is offline

On a hot engine that 120 psi could be static pressure-- the 150 psi could be static pressure with some gage error mixed in-- Heck, you may even have a broken shaft, compressor not even pumping- and all you are seeing on your gages is static pressure- influenced by a hot day or a hot engine. Does pump turn very easily? little or no resistance? Was engine hot when testing-- check system pressure when it's cool out.


-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

jgcox6 on Thu June 10, 2010 11:33 AM User is offline

thanks for your reply....the compressor does turn very easy....and the engine was a cold engine. If a compressor had a black death, would it turn easy?

ice-n-tropics on Thu June 10, 2010 1:42 PM User is offline

jg,
Early Durangos (made in Delaware down the road from DuPont) had a warranty problem with stuck expansion valves (made by Eaton/CC) in the optional rear auxiliary evaporator, which resulted in compressor failure
The preferred rear valve is made by FujiKoki
hotrodac

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Isentropic Efficiency=Ratio of Theoretical Compression Energy/Actual Energy.
AMAZON.com: How To Air Condition Your Hot Rod

Edited: Thu June 10, 2010 at 1:45 PM by ice-n-tropics

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