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I'm having an odd AC issue w/ my Nissan Frontier King Cab, 2001 (manual Trans.). I'm in Southern AZ, and it gets H-O-T here.

Last September I noticed an issue w/ my AC. When my Truck was left in the sun or in the heat, the AC would blow hot for a little while, then cold for a little while, then hot for a little while, then cold for a little while, and so on. It does not correlate to accelleration or anything else. Sometimes I'm accelerating and it blows cold, sometimes hot. Sometimes I'm at a complete stop and it blows cold, sometimes hot.

As winter came in (winter in Southern AZ is warm in the afternoon 55-65 degrees) my AC worked fine, no issues. As the weather warmed up again for summer this issue resurfaced. ONLY on hot days or when left out in the sun for a while. So, in the morning when I get up for work, my AC works great and consistent. Nice and cold. Eventhough I park in a garage, the afternoon drive home is awful w/ hot and colt, hot and cold. Subsequently, the cab never gets cool and I'm sweatin' it out in triple digit degree weather.

About a month ago I took it to a local chain mechanic w/ excellent rating from the BBB & has won awards for service and ethics. I've used them to service my vehicle (never serviced AC before w/ anybody) and I've been happy with em'. So, I brought it in and explained the problem. After they had a look see. They said that the performed their service, flushed the AC system. They saw no leaks or operation issues (compressor OK, etc.) The freeon or whatever was a pound low, so they filled it and added a dye to it. The dye was added, so if my problem continued they could easily see if there was a leak. Well, after a couple of days the problem resurfaced. So, I brought it back in. They looked at it for several hours unable to find any issue with the AC. No leaks, no compressor problems. nothin'. Finally, they decided that my battery poles had been corroded (and they had) and they said that the AC needed more juice from the battery in hot weather and couldn't get it due to battery pole corrosion. So, they cleaned off all the corrosion, made sue the battery cells had water and reattached the battery to the truck and said they got it to run cold consistently. I drove (mid-afternoon) stopped at the grocery store for an hour and came out to the same old situation.

What do I do now? I'm afraid to take it to the dealership and hear that they will just replace the whole unit for $ 1 billion Zillion dollars. There has to be an issue somewhere.

I had the transmission and clutch rebuilt in April, but I was having this issue before and after that, so I don't think it can be connected.

Any thoughts?
 

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how much money did you already pay for guesses?, I work at a dealer and I tell people all time. take it to someone who works on YOUR type vehicle all day. sounds to me like a common problem on Jaguars with the evaporator temp sensor that thinks the evap core is freezing and shuts off the compressor, or maybe it is freezing. anyway pay a check out fee for the dealer to check it out and go from there. You might pay more at a dealer but we know alot more perticular issues with the cars we work on than joe blow who'll work on anything that comes in the door.
 

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Freon could be leaking fromt he bottom of the compressor where the clutch is. It hard to see there, but I bet that is where the trouble is.
 

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dwest1023 said:
Freon could be leaking fromt he bottom of the compressor where the clutch is. It hard to see there, but I bet that is where the trouble is.
okay several things cold in morning but cant keep up with heat of day, 1# low on freon is alot, a few oz is allittle low. most 134a systems hold 1.5- 2# freon. second they said no leaks on 2nd check did they evac to see if the initial charge still there, or sniff system with leak detector? do they have one? dye is only good if you can see all components, cant see evap in dash, but if the leak is real bad check drain line for ac water underneath. also check to see if fresh air door is closed
when system is put to recirc of max. I havent seen an ac system yet that overcome hot fresh air constantly coming in from outside. it cools by constantly recirculating inside air over and over . try to drop 110 deg air when a good sytem drops ambient temp 30-35 debrees, still leaves you around 80. speaking of which I gotta get back to work, dont make any money on here..............lol
 

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Sounds like condenser is blocked with sand and road kill.
Blast it clean with garden hose, pressure washer, or self-serve car wash wand.
The condenser can't keep up with the heat of the day, which causes the pressure to rise and shut down the compressor.
While you're there, clean the radiator and the thermostat on the front of the engine cooling fan.
You can't test anything else unless you have very good airflow through the condenser. You should feel good airflow going through the front of the condenser at idle at all times, especially when very hot.
 

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2004 Nissan Frontier XE KC KA24DE
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@busemans Is the compressor clutch cycling on and off in conjunction with these warm and cold moments?
What's the lowest temperature reading coming out of the center vents at max cool setting?
Hook up some gauges and check the pressures.
 
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