Question about 2000 GMC New Sierra 1500

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I have a 99 gmc truck and the a/c cuts off while driving down the road, replace control head, high pressure switch and low pressure switch and the a/c compressor relay any suggestions

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Did you change the orfice tube,it should be found somewhere in the front around the radiator.It may be clogged.Do you live in hot climate,then change it for sure.

Posted on Jul 23, 2009

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I was told by A/C guy I have a short somewhere to the high pressure switch. something is not kicking on the compressor. another mechanic said I need a new computer. what do you think


go with the ac guy
there are systems that prevent the ac compressor working
high pressure switch which cuts the ac clutch if the head pressure goes too high
low pressure switch which cuts power to the ac compressor if there
is no gas in the system
climate control systems which cut power when the ac is not required
fuses to the ac system
get a better explanation or seek advice from other ac mechanics

May 01, 2015 | Cars & Trucks

1 Answer

My ac cabbot run on high speed, it will cool sometimes i have to keep turning switch off and on. what causes this?


if cut off in low pressure switch add gas, and if cut in high pressure switch reduce gas or replace orifice tube vaccum the system and recharge gas

Jul 01, 2011 | 1994 GMC Safari

1 Answer

2004 GMC Sierra 1500 5.3L(T). When driving down the road the AC goes from cold to hot all by itself. I touch nothing. I can move the controls later and nothing changes. Turn the truck off, turn the...


I'VE HAD TO REPLACE SEVERAL LOW PRESSURE SWITCHES FOR THAT ISSUE ALSO WIGGLE THE SWITCH CONNECTOR TO SEE IF A/C COMPRESSOR CUTS OFF
VERY IN EXPENSIVE

Aug 08, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

Loss of power on 1998 ford powerstroke 7.3 . pcm threw a p1211 code went to ford and got new icp. already replaced ipr. the hpop is full of oil. it idles all day and can hold 3000 rpms just fine but...


Generally the computer is reading a problem with the fuel pressure being to high or to low. The ICP is one problem it could be and you changed it. The other could be Fuel pressure regulator control solenoid or problems with the injector (s).

Nov 25, 2009 | 1996 Ford F350 Crew Cab

1 Answer

99 GMC Jimmy cutting off while going down the road.


check the fuel pressure, if that is ok, check the electronic egr valve. it can be removed and cleaned and replaced.

Sep 17, 2009 | 1999 GMC Jimmy

1 Answer

Have a 2003 stratus with intermittent A/C works great when on, where is the pressure sensor located?, that may be problem


On this Chrysler product they have an A/C Transducer located on the high pressure hose. The switch has three wires. They also have a thermo sensor located at the evaporator case behind the glove compartment. These two things are the only ones thatA jump in the system is only removing protection the system has. So it will damage your compressor or hoses. Find the compressor follow the high hose to the high pressure switch (transducer) it has three wires. Check under the dash by the glove box and you will see a round platick lid on the case with two wires that is your thermostat (thermo sensor).
control the compressor.

The A/C clutch is controlled by the A/C cycling switch (19E561) and the A/C pressure cut-off switch, which are connected in series. The A/C cycling switch is mounted on the suction accumulator/drier (19C836), and the A/C pressure cut-off switch is mounted in the discharge line at the A/C condenser.

The A/C cycling switch closes when the pressure on the low side of the system reaches approximately 276-324 kPa (40-47 psi). The A/C cycling switch opens when the pressure drops to approximately 163-175 kPa (23.5-25.5 psi), disengaging the A/C clutch. In ambient temperatures below -1° C (30° F), the A/C cycling switch will not allow compressor operation because of low system pressures.

The A/C pressure cut-off switch is used to interrupt A/C clutch operation in the event of high system discharge pressures. The A/C pressure cut-off switch is a single-function switch that controls A/C clutch engagement. When compressor head pressures rise to approximately 2896 kPa (420 psi), the contacts open, disengaging the A/C clutch. When the pressures drop to approximately 1724 kPa (250 psi), the contacts close to allow A/C clutch operation.

This problem can be caused by low refrigerant charge. Check with a manifold gauge set and temperature pressure chart.
The cycling switch is replaceable and there is a Schrader valve on the accumulator port so you do not lose your system charge when replacing. It screws on/off. It is available at any auto parts store. It protects the compressor from low pressure which can be caused by a loss of refrigerant and subsequent lack of lubrication and prevents evaporator freeze up. Replace the switch. It is about $10. The high presure switch is about $25.

Aug 26, 2009 | 2003 Dodge Stratus

1 Answer

99 Suburban A/C Not working


The A/C pressue switch may be bad as well. Also the mode switch on the control head inside the vehicle. There are many other exsisting problems pertaining to a/c. I suggest a manual from Auto Zone for many faults can be noted especially wiring can be at fault

May 23, 2009 | 1999 GMC Suburban

3 Answers

Ford F150 front tires won't engage in 4 wheel drive


look on fire wall pass. side you will see 2 parts with vacume lines attached 99 percent of the time that is what went i had the same problem

Dec 15, 2008 | 1999 Ford F150 Regular Cab

2 Answers

A/C sporadic compressor. Bypassed high and low with paper clip. Pressures good has Freon. Clutch tests OK. Vehicle runs for maybe 10 min or some times 30 then A/C shuts down. Maybe A/C will fire up...


This is just a suggestion but you should check to see if you have a thermostatic control switch in your evaporator this could be the cause if the intermittent problem.The switch is actually used tokeep your ac from freezing up i believe.

Jul 24, 2008 | 1999 GMC Suburban

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