Question about Chevrolet Suburban 1500

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95 Suburban A/C will not blow cold air, recharged the system, checked clutch switch and with pressure on the system it is reading 0.1 Ohms and 12.2 VDC. Jumpered across clutch swt. and clutch comes on. Replaced clutch swt. with new one still no compressor clutch and no A/C. What else makes the compressor come on?

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  • Chevrolet Master
  • 3,433 Answers

Dash controls (fan speed)
Temp setting interior thermostat
Hi/low pressure safety switch on suction line
A/C clutch relay
Fuse
Good Luck

Posted on May 26, 2010

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Posted on Jan 02, 2017

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2 Answers

A/C stopped blowing cold air and clutch not engaging after charging so I got a radiator fan assembly temperature sensor and tested the three relays but the fan's are not coming on.


if you recharged the ac system then it is probably over full in which case the high pressure switch will stop the compressor clutch from working
take it to an ac specialist shop for a pressure test as it is not charged by the amount but by the pressure readings

Jan 30, 2017 | Cars & Trucks

4 Answers

Ac blows cold air..then will blow vent temp air for 5-10 min...then back to cold air...about every 5-6 days or so. Had ac check...1# coolant added??no leaks per black light??? Air is cold when works.


The system needs to be evacuated with a vacuum pump before it is recharged. Otherwise moisture may be in the system which will displace and contaminate the refrigerant. Get it evacuated, the orfice filter replaced then recharge. Should be fine..

Aug 02, 2014 | 2005 Ford Taurus

1 Answer

2007 ford KA blowing hot air


see this causes and fix it. God bless you
Compressor Checks
checkmark.gif Start with the compressor. Does it engage when you turn on the A/C?
If so, the compressor is working and the A/C system probably contains enough refrigerant to make cold air, so the problem is inside the HVAC unit. Replace the motor that controls the blend air door (this is a difficult job and best left to a professional since it involves tearing apart the HVAC unit -- about an 8 to 10 hour job!).
If the compressor does not engage when you turn on the A/C, see if it will run by jumping the compressor clutch wire directly to the battery (use a fused jumper wire). If the compressor works when you jump it, and the A/C blows cold air, the system contains refrigerant and the fault is likely a bad A/C compressor clutch relay or a bad clutch cycling switch or pressure switch.
If the compressor does not engage when you jump it, the problem is a bad compressor clutch.
If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor.
If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged.
Refrigerant Checks
checkmark.gif Connect an A/C pressure gauge to the HIGH SIDE service port (located in the high pressure hose that runs between the compressor and the condenser in the front of the engine compartment). The gauge will tell you if there is any pressure in the system. Simply depressing the service fitting valve with a small screwdriver to see if any refrigerant squirts out is NOT an accurate check because it tell you how much pressure is in the system. It may still have some pressure but not enough to trip the low pressure safety switch so the compressor will engage.
If your A/C system is low or out of refrigerant, check for leaks, then have the A/C system vacuum purged to remove air. After the air is out, it can be recharged with the specified amount of refrigerant. It is important to get any air out as this will reduce cooling efficiency and may make the compressor noisy.
A/C System Functional Checks
checkmark.gif If the refrigeration circuit seems to be working (refrigerant in the system, compressor running and building pressure), but there is still no cooling, the problem might be an obstruction in the orifice tube (located in the high pressure hose between the condenser in the front of the radiator, and the evaporator located in the passenger compartment). A blockage here will prevent the refrigerant from entering the evaporator or recirculating through the refrigeration circuit.
If the orifice tube is plugged, the high side pressure reading will be lower than normal, and the low side reading will also be lower than normal because no refrigerant is circulating through the system.
checkmark.gif If the refrigeration circuit seems to be functioning normally (compressor running, frost or condensation on the high pressure line from the condenser to the evaporator), but no cool air is blowing out of the ducts inside the car (and the blower is working), the fault is likely a BLEND AIR door that is stuck in the HEAT position, or possibly a badly clogged cabin air filter that is restricting airflow. Another possibility would be a fault in the automatic climate control system such as a ad interior temperature sensor or control module.

Sep 28, 2012 | 2007 Ford Ka 1.3

2 Answers

I recharged my 01 durangos a/c it is at the suggested pressure but is not blowing cold air


If you recharged it with r134a and it had something else, i would make sure you had the conversion correct, i think its 85% of the weight of the original system. If all of that is right, i woud make sure that all your pressure switches are correct on the system.

Jun 25, 2010 | 2001 Dodge Durango

1 Answer

Ac won't work


large leak in system, faulty low pressure switch, a/c clutch faulty, a/c compressor faulty, system clogged, fuse blown, wiring faulty. orifice tube clogged, too much air in system. read more here:

http://www.aa1car.com/air_conditioning.htm

Jun 01, 2010 | 1999 Dodge Intrepid

2 Answers

I turn the ac switch on but nothing happens do i need a new switch


check freon pressure. if freon is low, pump wont even kick on. It can appear electrical.

Nov 17, 2009 | 1998 Chevrolet C1500

2 Answers

Blowin hot air system pressure way to high


is the ac condensor clutch engauging

May 22, 2009 | 1994 GMC Suburban

1 Answer

My 02 trailblazers air conditioner blows real cold air but sometimes it won't blow out cold after i turn the truck off and start it back up . after i drive for a while it starts blowing cold again the...


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.

Jul 15, 2008 | 1997 Chevrolet Cavalier

1 Answer

1999 gmc 1500 sierra truck v8


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

Jun 25, 2008 | 1999 GMC Suburban

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