Question about 1997 Chevrolet Blazer

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Compressor cycling too fast

A/C compressor cycling on/off every few seconds. Air is cool not cold. Think too much r134, how do I bleed some off?

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  • Master
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You cant guess at the pressure in the system. and its not a good idea to bleed off any r134a. it is now known to be a powerful green house gas. so should be recovered. however its easy to see what the pressure is. there are low cost gages that come with some r134a kits. that will likely tell you the pressure is low. typically that's what causes the compressor to cycle. there is likely a leak somewhere .. the r134a molecule is very small and its hard to keep things from leaking. you can use soapy water around the crimped rubber hose ends and connectors. that's what usually leaks. there are two ports on the air conditioner .. a high pressure and a low pressure .. the low pressure port is what you add fluid into. its just a valve similar to a tire valve. if you were to push the valve open then refrigerant will vent just like a tire .. but don't ever do that with your finger. it will freeze. unfortunately you will also be venting oil that flows along with the fluid. that can damage your system. if you vent too much then your system will have to be put on a vacuum pump to start over.
1. check for leaks with soapy water. look for bubbles while the system is running. look for oily spots that might indicate a leak.
2. check the low pressure side for proper pressure. chances are it will be low indicating not enough r134a
3. repair whatever is leaking before refilling. use the gage to determine when properly filled.

the system has a pressure switch that makes sure their is always enough pressure on the low pressure side. that's because if the pressure gets too low there is danger of sucking in air and that will damage the system. so if the pressure gets below a set value then it shuts off the compressor. the pressure builds back up and the compressor comes back on then again the pressure drops as the system builds up. that's why it cycles fast . there is not enough fluid to keep minimum pressure while operating. if you have too much r134a then typically it will work but will probably blow out a hose. adding fluid to a leaking system will only make it work until it leaks back out .. sometimes that can last a year or a day, depending on how bad the leak.

Posted on May 20, 2014

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  • Chevrolet Master
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You have air in the A/C system. The only way I have found to get rid of it is to discharge the entire system and then do a complete re-fill. This can be done using the fill tool sold with any commercial R134 refill kit at the parts store / WalMart, etc. Just hook up the fill tool
while engine is off and allow to drain out completely. Some of them you have to squeeze the handle to do so. Takes a few to get it all out. Then recharge with engine running and A/C turned on to MAX. It is really better to have it done somewhere they can pump the system down, you get a longer lasting recharge.

Posted on May 23, 2014


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Posted on Jan 02, 2017

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SOURCE: 1999 GMC Sierra 1500 A/C blows warm air when idling

the low pressure port is the charging port, this port is either in the low pressure line or the accumulator that the low pressure lines to to (can shaped object), the low pressure line is the larger of the two lines from the compressor.

Posted on May 27, 2009

  • 233 Answers

SOURCE: Cool but not cold air from my ac system

It sounds simple enough that you need to recharge your A/C unit. They can stop functioning properly after winter's end especially if they were not used. You should be able to get a recharge kit from your local auto parts store. Your Suburban should use the newer R142a refrigerant.

Posted on Jun 09, 2009

  • 520 Answers

SOURCE: 96 Tahoe no Cold Air

Yes... you are most likely low on freon as the compressor will cut on low pressure before vacuum.Depending on ambient temps and head pressures your running ,you may see low side pressures at 50. Automotive refrigerant (134a) is not far from matching the degress to low pressure....for instance 50 lb low side pressure will give you approx 60 degrees cooling at the vent.Once cabin temperatures are met is when you can expect that suction pressure to lower and stabilize.You would be better off watching high and low pressures to get the full picture of whats going on here...good luck

Posted on Jul 22, 2009

  • 521 Answers

SOURCE: i have a 02 chev tahoe,with dual a/ cold air

freon level is low . One of those 2 ports u see will be the one u want. It will be the smaller of the 2 as the refill hose will only lock onto the correct fitting.

Posted on Aug 10, 2009

  • 73 Answers

SOURCE: a/c trouble 2001 silverado

you havent check the pressior of the compressor make sure is full loaded

Posted on Aug 11, 2009

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If starting from scratch. Turn engine on with AC on Max. Add 1 can first, and the compressor should start to cycle and the air should begin to cool. Add the next and the compressor should run almost consistently. You should get cold air by then and you have enough R134 in it to work well. If that doesn't cure you, then you will have to trust their diagnosis.

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1. if refrigerant (r134a) is low then the clutch will cycle or not come on at all as the pressure in the system drops below a critical value .. in general if this is the case it may work better (for longer) if it is really hot out .. and maybe not at all when its cool
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if there is no damage to the blower switch or wiring then i would check the refrigerant pressure .. in r134 systems slow leaks are often seen that cause the pressure to drop to the point where the system cant make up its mind about running. typically the compressor will run for a few seconds at a time .. a steady but fast cycling (not random) you can get a r134 pressure gage at any auto parts shop but you should know how to use it or find someone that does ..

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