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My 2007 350z ac will not blow cold air when I first crank it up. I have checked the Freon and pressure and its all good. The compressor is turning on just no cold air. Then I noticed Iif I rev the car to around 3000rpm it would start blowing cold air. Is this a vacum problem once it start blowing cold air it dossnt stop until u shut off car and start it back up a few minutes later.

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: Air Conditioner works intermittently

It could be your low pressure cycle switch is going bad. Check the connection to the switch and it's is located on the A/C Accumulator. The other thing to check is the A/C relay and that is located in the glove box. There is a panel in the glove box that say's relay, there is three relays in there and one of the out side relay's out of the three is the A/C. can not remember which one it is. The middle relay is the fuel pump and the other one is the third break light. Switch the two out side relays and see if your A/C get's better. the other thing too is if the R134a is just a little low, and needs to be topped off. Good luck and hope this helps. if your going to try to recharge the A/C system your self, keep in mind not to over charge.

Posted on Jun 10, 2009

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Low freon will cause the compressor to short cycle, when the compressor runs the pressure in the low line is pulled down and the low pressure switch turns it off. Not running the pressure builds up and turns it back on. In the old days there was no low pressure switch, with no freon to carry the oil the compressor was destroyed.

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If you take your car down to a Pep Boys, you can ask for a free AC check and they will check the pressure on your lines. If there is appropriate pressure, then you can tell generally that it is a component of your AC system, most likely the compressor. If there is no pressure, you can have them refill the freon, but bear in mind that it will eventually leak out again unless you have them find the leak and fix it.

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My ac was blowing fine and cold until my ac compressor went out. i bought a used ac compressor wit new dryer/accumulater, and orfice tube. i had that for awhile and i replaced it again because the air...


If the car was retro fitted with R134a this was a common problem. There was a low side pressure sensor that needs to be changed. R134a runs different pressures than the r12.. When you go down the road the condenser cools off the system and the pressure drops below the minimum pressure. You need to make sure that the system is fully charged, not just cold to the feel. Both pipes coming out of the firewall need to be the same temp. this makes sure that the evaporator is flooded.
I hope this helped. Re-post if you need more info. Have a nice day and good luck.

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This is most likely the cycling of the AC unit. As the compressor pressurizes the 134a Freon you get the cold air, once it reaches a certain pressure it cuts out. If you are low on Freon it will cycle out more often. Check your freon level with a gauge to see if your within the proper tolerance. If the compressor runs for a period and doesn't reach the right pressure it will cut out to keep from damaging your compressor so it is important to keep the correct amount of freon in the system.

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you are going to have to put tracer dye in the system and check for leaks
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Could be the expansion valve. That's what allows the temperature to actually drop in the system - the contents of the AC system are under pressure, and are at a certain temperature. When the freon goes through the expansion valve, the pressure drops suddenly and dramatically, which "flash chills" the freon, allowing the air to blow cold. If it fails, you may get lukewarm air from the AC despite everything else working. Also though, check to see whether the AC evaporator fan (underhood) is working - on some cars, if it doesn't turn on, the compressor won't be run enough to cool the air.

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