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04-26-2002, 05:57 PM
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#1 |
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Registered User
Join Date: Jan 2001
Location: Slaughter, La
Posts: 153
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A/C 60 degrees only!
Can't figure it out! I can't get my temperature to drop below 60 degrees. I have converted it over to R134A, cycling mod from Old Air that replaced the POA, new dryer, new seals. Yes, the heater valve is off.
I have had 3 different shops look at it. All say the same thing. That the pressures are good, the compressor is cycling at the right pressures, etc. But still getting hot air. They can throw their hands up but I'm sweating! I just pulled the cowl guard and ran my water hose down it. Looks good. I haven't taken off the front fender but I have looked very hard and the air intake box looks good. I need to replace the air damper but I stuffed some towels around it to eliminate that. With the lever all the way to the right, the outside damper is closed and the one inside is open. Is that correct? Anybody in the southeast do A/C work? I'm willing to travel to get it fixed. I'm stuck!!!! Any suggestions, hints. ------------------ 71 C20 Cheyenne 71 K10 SWB Cheyenne 72 C10 Cheyenne
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68 50th Longhorn Custom Camper 396 A/C 25 options 71 C20 Cheyenne 71 K10 SWB Cheyenne 72 C10 Cheyenne ----------------------- Slaughter, La |
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04-26-2002, 08:37 PM
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#2 |
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GMC SHORT FLEET F/S
Join Date: Jun 2000
Location: SOUTH WILLIAMSPORT PENNSYLVANNIA
Posts: 2,117
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whats your supply air temp?
------------------ Charles W. Hein S. Williamsport PA imaindianoutlaw@yahoo.com REFRIGERATION TECH 1971 Rolling chassis FOR SALE 1963 Pontiac Tempest 1965 Pontiac GTO 1956 Pontiac 2 dr
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CHARLES WADE HEIN HVACR FOREMAN. LEWISBURG U.S.P. |
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04-27-2002, 12:51 AM
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#3 |
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Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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The air vent should be on the recirculate position(not drawing from outside). Try having someone spray water on your condenser core while you have the air on and see if the duct temp goes down. Make sure the conderser is clean, and you're getting plenty of air across your evaporator, sometimes they will freeze up if not getting enough. I've never been able to get 134A to cool as well as R-12, if I remember right, about an 8 degree temp difference, and around 90 degrees ambient to 100, they don't work real well.
------------------ Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84 ralleys and 31/10.5s Angel girl: 67 Cutlass convertible 330, 3spd stick Greener: 90 GMC Jimmy 350/auto Chad Stephens Orleans,NE no name yet: 72 442 under serious construction
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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05-27-2002, 06:38 AM
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#4 |
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Registered User
Join Date: Jan 2001
Location: Slaughter, La
Posts: 153
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I got it fixed! I had too much pressure! I had 32 lbs, what the books and professionals called for. I was talking with a client who has a 69 truck and he told me that I had too much pressure. He said that I need 28 lbs at 1500 rpm's. I got the wife to rev her up and I leaked a little out (reclaim pump for the EPA quys) and now I'm a cool 40 degrees.
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68 50th Longhorn Custom Camper 396 A/C 25 options 71 C20 Cheyenne 71 K10 SWB Cheyenne 72 C10 Cheyenne ----------------------- Slaughter, La |
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