Automotive Air Conditioning Information Forum (Archives)

lacina17 on Sun July 31, 2011 9:21 PM

Year: 2004
Make: damon
Model: intruder
Engine Size: 8.5l
Refrigerant Type: 134a
Ambient Temp: 104
Pressure Low: 37
Pressure High: 245
Country of Origin: United States

Hello. I decided to try a few things at a time. I evacuated the system and drew a 26 inch vacumm. I do have the extra condensor so I charged the a/c with 3 lbs. of 134a. Now I have low presure of 37, high of 245. ambient of 104, on max. air, heater hose pinched off compressor on steady, 3 cooling fans running and have 60 out of the vents. Does this show the need for the expansion valve and the reciever dryer to be changed? Thanks for your advise, Len



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Leonard J. Lacina

JJM on Tue August 02, 2011 12:38 AM

Forgive me, but I don't even know if this a motorcycle or an armored personnel carrier. Never heard of a Damon Intruder.

If you think expansion valve might be bad and it has a sensing bulb, carefully remove it from the evaporator outlet pipe, making sure not to kink or otherwise damage the capillary tube. Prepare a container of crushed ice and water (32ºF), and another container of hot water (approximately 125º or more). Start the engine and run it at 2,000 RPM, and record your pressures with the air-conditioning on. At this point your low side will be high. Immerse the sensing bulb in the container of ice water, and the low side pressure should drop. Immerse the sensing bulb in the container of hot water, and the low side pressure should rise. If the pressures do not change, or change very little, the expansion valve is defective and must be replaced.

Joe

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lacina17 on Tue August 02, 2011 10:00 PM

Hi, thank you so much for your advice. The vehicle is a 38 ft. motorcoach. on a gm w22 chassis. thanks for the diagnosis procedure on the valve. Len

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Leonard J. Lacina