Question about 1997 Pontiac Bonneville

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Ac compressor what would cause the compressor to freeze up if the defrost is on. and how can i check it my self?

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The AC compressor freezes up due to a broken piston rod inside the compressor or a pump piston has come apart or the front pulley bearing has seized, have seen all three, the reason for these failures? time in use and miles, didn't I just answer this question on another post?

Posted on Feb 12, 2009

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Can i cut my ac belt off and still use my defroster? My compressor crapped out and cant afford another one . But winter is upon me very soon and need the defroster.


more information would be advisable year make model engine --if you have a serpentine (a single belt )leave belt on unless compressor is stuck seized because all other accessories will be affected if compressor is by it self can remove with out problem it wont affect your defrost in winter

Sep 15, 2015 | AC Cars & Trucks

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Ok 2005 chevy malibu. Fan hits on all speed rear defrost works. temp control does nothing no heat no ac. Blower blows from dash vents only no defrost no foot no blend on vents no nothing. Compressor does...


replace the switch its self.. you can search ebay motors under electrical and find one easily.. also they remove easily and just plug in the back..

Apr 05, 2014 | 2005 Chevrolet Malibu

1 Answer

What causes the ac on a 1996 Isuzu Rodeo to turn on occasionally?


If the compressor is engaging when it should not be, the problem could be the compressor clutch or a faulty relay.
The compressor normally runs in defrost as well as ac.

May 27, 2013 | 1996 Isuzu Rodeo

1 Answer

The ac unit freezes up when it gets really hot and humid out and the ac blows hot air. what would cause this problem? it seems like the unit is freezing up and getting too hot and not allowing itself to...


This is caused by the low pressure AC compressor cycling switch, it is a very cheap part and located in the larger of the two AC lines coming from the AC compressor.

Jun 22, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

I have a 1999 Grand Voyager. Whenever it rains, the serpentine belt comes off. What's the problem and solution?


Ok..that is a strange one.. I am going to hazard a guess and suggest you look to the AC compressor.

When you run the defroster the ac compressor comes on..typically whenever the outside temp is above 40 degrees.. the ac compressor kicks in to dry out air inside.

Often when it rains.. the windows fog.. you turn on the defrost.. the ac compressor tries to come on.. and.. there ya go.. rather there your serpentine belt goes.

Several things could cause this.. worn belt.. failing belt tension-er... or failing ac compressor..

If the ac compressor is frozen meaing it will not turn..when the electric clutch on the front engages.. it would cause the pulley to stop turning.. and the belt would have a hard time staying on a non rotating part.

Or if the belt tension-er is bad..or the belt is worn.. when the additional load of the compressor kicks in.. it jumps off.

Finally it could be a combination of all three..


Best of luck..

Apr 04, 2011 | 1999 Plymouth Grand Voyager

1 Answer

How do you add the 134a to a 1997 chevrolet lumina?


Go to wal mart $6.00 a 12 oz can,may need 2 cans. Car owners manual will tell capacity in oz of AC system never charge over that amount into your system, also PSI and ounces are not the same thing

Go to auto parts store buy R-134a charging hose kit with a gage built in.$ 10.00

Turn engine OFF Under the engine hood, is a large aluminum cannister usually on passengers side ,on it or on a hose coming out of it will be a black plastic cap,with a connect fitting under, remove cap, pull and hold back the locking ring on the charging connector and push on fitting. look at gage it will show how much freon pressure is in system, with engine and ac off a higher pressure value will be on gage Start engine and turn ac on cooldest and fan high. The pressure will drop. if the pressure drops below about 22 PSI the ac compressor will stop automatic by the low pressure cut out switch.then the pressure will build above 25 and the compressor will engage again, this is short cycling(no/off) on the low pressure sensor and is a good indicator of a low charge of refigerant(R-134a). Charge according to instructions on kit. When the pressure stays above 28 and the compressor stops cycling off your good DO NOT over charge or you can cause compressor slugging. Liquid into compressor($1200.00 for new compressor)
SAFETY!!!!
R-134a can cause blindness. wear goggles and gloves

The "O" ring seals in the ac system dry out when the ac is not in use for over a month and leak the refigerant out again, So Use your defrost setting in the winter because it runs the ac compressor for dehumidifying, but only after the engine has warmed up a little, or with no warmth from engine the defrost will blow freezing air.

Patrick Mot

Feb 11, 2011 | 1997 Chevrolet Lumina

1 Answer

AC freezes up after running two hours.


If it actually is freezing up,the low pressure switch is the likely cause.It is screwed into the large ac line near the firewall,witch is the cold line.If it is not there it is in the dryer,near the firewall,or under the air filter box.Follow the ac line(large ac line/hoses)from the ac compressor untill you come to the switch,that is the easy way to locate it.This low pressure switch causes the ac compressor to cycle on and odd according to the pressure sensed from the ac low side line.When it gets really cold the pressure is lowered,and there for it will cut off,and when the pressure rises,it cuts the ac compressor back on.It would be a really good idea to check the freon in the vehicle first.If the ac system is low on freon,it will freeze up on some vehicles.

Aug 25, 2009 | 2005 Chevrolet Equinox

1 Answer

My condenser/compressor popped it's lid off


sounds like your pressures were to high replace your compressor 2 to 350.00$ new dryer 80.00$ high pressure switch 40.00$ flush all lines and coils vacume and recharge self 500.00$. A shop 9 to 11 hundred probubly have your system checked yearly because AC pressuers fluctuate from season to season and if you dont need your AC in the winter Pull that fuse cause in defrost mode your AC is on.

Jul 30, 2009 | 2004 Dodge Intrepid

1 Answer

Idle Revs With Front Defrost


when you use the front defrost in the winter the cycling of tha a/c compressor will cause this condition.

when you use defrost the a/c is run to de-humidfy the air that is blown onto your windshield.


in the summer this is not a big deal as it is hot enough outside to keep the a/c system pressure above the compressor clutch cycle threshold. but in the winter the general lack of heat in the ambient air and the lack of humidity results in rapid cycling of the ac compressor.

the idle is bumped up to compensate for the load of the a/c compressor, or else your engine would stall out. but when the compressor is disengaged the idle is dropped. but it raises again when the compressor cycles back on.

there may be a good chance that your ac is under charged after all these years. when the weather gets warmer have the charge level in your ac system checked.

a low charge will also increase the on off on off cycling of the ac compressor, usually resulting in the complaint that you have. so the base issue of your problem is low ac system charge.

Apr 11, 2009 | 2000 Jeep Wrangler

1 Answer

2006 ford fusion ac problem


As a Ford dealer tech I found this was always caused by the AC compressor cycling switch, it shuts the compressor off when it reaches about 30 PSI, this prevents freeze up and saves fuel, when the system press rises again to about 42 PSI it turns the compressor back on and so on, change the switch, it is located in the low pressure line from the compressor, that is the one that gets cold.

Oct 06, 2008 | 2006 Ford Fusion

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