Engine Size: 351
Refrigerant Type: 134a
Country of Origin: United States
Hello everyone. I have a 79 Ranchero that i totally rebuilt the whole A/c system. New paralell flow condensor, rotory compressor, all new hoses, expansion valve and POA/STV eliminator. Works awesome as long as the compressor is engaged, low side switch cuts out at 22 PSI but doesnt cut back in until 43-44 PSI. By the time the compressor cuts back in the air coming out the vents is 45-50 degrees. Its very annoying to be driving around town having the vents go ice cold then cool and back again to ice cold. For now I adjusted my switch down to 15 PSi cut out but I know I will eventually run into evaporator freeze up. Funny thing is that it still cuts out at 43-44 PSI after I adjusted it lower. What I was wondering is, does anyone know of a switch with closer "on-off" pressures? Such as off at 22 on at 32 or something like that, I understand that with this type of switch the temps will vary a little but a smaller variance would be much nicer. I thought maybe a low pressure switch off of a newer vehicle that uses 134a like a General motors product in the 95 up range. What do you guys think? Thanks in advance for any and all help.
Forget the POA eliminator. Ideally, use the valve like stock, they work with R-134a. If you can't procure a working POA valve, fit a temperature switch to the evaporator. Leave the "POA eliminator" in line but don't hook up the switch. Bottom line is don't try to cycle a TXV system on pressure.
Thank you for your reply. I kinda figured that was the answer to my problem. If I were to use a temperature switch do I have to put it in the fins of the evap or can i attach to the outlet tube and insulate it? Also, where I can I buy a temperature switch? Thanks for your help.
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