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Discussion Starter #1 (Edited)
AC Compressor don't work- 01 Frontier V-6

Calling all geniusus on this site here ye here ye. My ac sysytem for the past week has been been running cold, semi-cold and not cold at all sometimes. Previous to this my ac system has been trouble free for years. I figured it needed some freon so I checked the psi and it read 30 psi which is ok but on the low side. While I was checking the pressure I noticed the compressor cycled on and off every 30 or so seconds. Anyway, I put in a can of freon in the low pressure port and everything was chillin for a couple days. Then suddenly my ac system strictly blows non cold air and the compressor does'nt run at all. I checked the psi and it read 15 psi with the compressor off. So I tried to get the compressor running by adding another can of freon and it still does'nt run. The psi in the system with the compressor off now reads 70 psi. So, it still does'nt blow cold and the compressor now does'nt run. Any ideas anybody?
 

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I suspect you have massively overcharged your system. The pressure on the low side when operating should be between 16 and 51 PSI. Go to our DIY section and download your factory service manual for more information. From memory, there are several sensors that must be "satisfied" before your comrpessor will run:

-Dual pressure switch must read in the acceptable range - if it's too low or too high the ECU will not turn the compressor off.
-Compressor overheat sensor must be closed
-Evaporator sensor must be above a certain temperature (prevents freeze up)

This evaporator sensor is a common failure point according to a couple of posts I have read here. Check out this thread.

http://www.clubfrontier.org/forums/f46/c-only-working-half-time-47344/

Good luck!

Heath
 

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Freon? Weren't they using HFC-134a by 2001?
 

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Discussion Starter #4
Hey thanks Heath, i'll check out that thread. I've heard about that evaporator sensor too. Does it sound symptomatic of this part?
 

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Freon? Weren't they using HFC-134a by 2001?
Relax, Freon is a brand not a type of refrigerant and many still referred to refrigerant as Freon regardless of the type. His vehicle uses 134Aa and he would remember paying out the a$$ if he had purchase r22. In my neck of the woods I can only get the 10 lb bottle for $215.00
 

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Relax, Freon is a brand not a type of refrigerant and many still referred to refrigerant as Freon regardless of the type. His vehicle uses 134Aa and he would remember paying out the a$$ if he had purchase r22. In my neck of the woods I can only get the 10 lb bottle for $215.00
LOL 9 yrs too late...
 

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