Question about 1994 GMC Suburban

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Blowin hot air system pressure way to high

Ac system reading way to much pressur and it does not blow cold air in my 1994 gmc suburban

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Too much pressure in the ac system is just as bad as not enough pressure... to much pressure can actually stop the ac compressor clutch to not be able to disengage therefore ending up burning out the compressor... start off with checking if the compressor is engaging then if it is bleed off some of the pressure until its in the proper range... if that still doesn't solve the issue you may have some moisture in the system and will therefore need to have the whole system vacuumed out and replace the drier then recharge the system.

Posted on Feb 27, 2013

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Is the ac condensor clutch engauging

Posted on May 22, 2009

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1 Answer

1995 Buick Century blowing hot air.


A mechanic would check the system with a set of pressure gauges. If the compressor is running, the low side would read around 30psi and the high side would be around 250psi. That is how you know if the system is full of freon or not.
You may have to get a professional diagnosis to proceed. If you replace the compressor, the accumulator needs to be replaced and a vac pump is used to pull all of the air out before the freon is added.

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When you change from heat to air , it still blowes hot air like it is not switching to air conditing, the compressure is running and lines get cold, but no cold air. thanks


If the orifice filter is clogged, this will happen, a better check can

be done with an ac manifold gauge set, the low side reads the

evaporator pressure and the high side reads the discharge

pressure. I had the same problem while checking the ac on a

2000 gmc 1500 z71 4x4. other things that could cause this are

to much oil in the ac compressor or not enough freon in the

system. an overcharged system , the best way to check it is with

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and oil in the system. plus the gauge set will let you know the

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Two questions on my 1999 gmc suburban K1500: 1) The 4wd switch has no power (no lights lit) and will not switch. Its in 2WD now, but will not make any differential changes. Looking for troubleshooting...


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Below are normal car AC pressure readings with 134A.
  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI
  • Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor

BOTH readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;


1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.


2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?


3. What is the outside temperature at the time the readings were taken?


4. Check to see if the condenser fan blowing strong?


5. Notice if compressor clutch is cylcling excessively.


Thank you for using fixya and be safe

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Is 1 of the 2 AC (under the hood) lines cold? if so you may have a blend door problem, that door is in the dash air duct distribution system, it mixes are between the hot heater core and the cold AC evaporater core to give the set or desired air outlet temp, When you turn the defrost on does it blow hot/cold as the lever is moved back and forth? The compressor turning off and on is normal cycling of the system, when it reaches a preset pressure in the low side line, a pressure switch will open and compressor will "cycle off" when the press starts to rise to a preset limit the compressor will "cycle on" and so on. I assume you have an electric bled door, older cars and trucks use a cable operated mechanical door.

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when an AC gets real hot and there is air in the system you get what is called High Head Pressure and the high pressure switch will not let the clutch engage. Need to have the system evacuated and recharged.

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The clutch in compressor is controlled by a pressure switch. Start there.

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