ac help

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  #1  
Old 09-30-08, 03:19 PM
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ac help

have a 93 ford van converted to r134 3 years ago and ac was fine,last week lost its cold punch,and the compressor was cycling on and off frequently,added a can as the cheap guage kit i have said low,still low added 2nd can now in middle of green range but compressor stays on constantly,any ideas,thanks in advance
 
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  #2  
Old 09-30-08, 04:17 PM
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Do not keep adding refrigerant. If you are low in refrigerant (determines by a manifold pressure gauge), you have a leak somewhere.

What was changed out during this conversion?
 
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Old 09-30-08, 04:33 PM
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dont remember,but i beleived he just cleaned out system and changed the fittings,it ran good for 3 years,on older cars there is always some leakage,usually put in a can and ok for another year,what does it mean when the compressor stays on all the time?
 
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Old 09-30-08, 04:50 PM
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If alls he did was change the port fittings, you got issues.

Accumulator/Dryer

Orifice tube

High pressure cut off switch

Expansion tube

All these need to be changed in a conversion, and it's never cheap.

If these were not replaced, I'm betting you have a leak somewhere. The best way to find it is have a mechanic inject dye into the lines and check it under a UV lamp.

If the compressor is running all the time, its most likely a leak.
 
  #5  
Old 09-30-08, 05:07 PM
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You certainly have a leak that needs to be found and fixed, even old cars are not supposed to lose refrigerant. As far as the comp. running all the time, if the ac is on max the compressor is supposed to be on all the time, unless the vehicle interior is very cold. If the compressor does not shut off when you turn off the ac then you have an electrical issue. No way a leak causes the compressor to run all the time, once the system gets low enough the low pressure cut out will turn the compressor off not on.
 
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