Question about 2006 Buick Lucerne

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Pressure switch air compressor not

Blowing hot air with A/C turned on. I ran a hot wire to the compressor to see if it would come on and it did. Car started to blow cold almost immediately with hot wire ran, but I did not leave it hooked up, it was only to test the compressor. Do anyone have suggestions as to what the problem may be?

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  • 7 Answers

Add Freon see if it comes on then its low on freaon leak somewhere if not may be a bad low pres switch also do the fans come on when you switch to ac ?

Posted on Apr 01, 2014

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Posted on Jan 02, 2017

olwork
  • 237 Answers

SOURCE: air conditioning blowing hot on 2002 buick lesabre ltd

Could be a number of possibilities. However, the most likely is loss of freon. The O-ring seals at a number of line connections tend to leak over time. There are other mechanical and electrical possibilities but you should first have someone check the freon charge with a set of gauges to measure the pressures. It might cost you a bit to have it tested but the pressure reading will tell you a LOT of things. In the long run it will save you money over guess-work.

Posted on Jun 24, 2009

  • 1 Answer

SOURCE: 2000 buick lesabre 3800 has

I had same problem on 2000 Lesabre blowing cold on passenger and warm on driver. I fixed it by adding more freon even though it had 28 pounds of preasure. Now it works great!

Posted on May 22, 2009

  • 3 Answers

SOURCE: heater blowing cold air Buick Century 2000

does the car not heat up in general? Whats the temp gauge doing and how long of a ride have you tried this for?

Posted on Jan 06, 2009

  • 400 Answers

SOURCE: 2000 buick century blowing hot air on one side and

The temperature actuator has gone bad. You will need to replace and have it recalibrated. You could try and disconnect the battery for a few hours and see if it will reset it's self. But you will be in the same boat before too long. And will eventually need to replace it.

Posted on Jul 01, 2009

honeymokey
  • 3113 Answers

SOURCE: Air compressor clutch not engaging? No cold air

No freon pressure no clutch action.

Posted on Aug 20, 2009

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1 Answer

Aircon air problems


put a tester at the wire to the ac clutch(bit behind the pulley) and turn on the ac and the blower motor. If it lights up then the problem is in the AC system. There are to pressure switches in the system that protect the compressor. On stops the compressor if the pressure on the outlet side gets too high and the other stops the compressor if there is not enough gas. Have an ac mechanic run a pressure test to see what the problem is . If the TX valve is blocked then the pressure will be high.

Nov 08, 2013 | 2001 Chrysler Town & Country

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.

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1 Answer

AC compressor won't turn on by itself.


I would check the low pressure switch next. The switch cuts power to the compressor if the pressure is too low. The switch can fail.
Same goes for the high pressure safety switch.
As for leaving the relay bypassed, you would need to use a test light or meter to see if you are using battery power with the key off. I would not recommend it.

Sep 07, 2012 | 2000 Honda Accord

1 Answer

Everything on ac has been replaced and its still blowing hot air. It seems to be some kind of electrical problem because the compressor is not engaging most of the time. when it does it blows very cold air


The accumulator a long cylinder depending on the car may be located close to the fire wall under the
hood or close to your condensor. it will have a pressure switch, called a low pressure switch senses
freon pressure in the accumulator, if it is not getting voltage to it or there is a leak on its seal, it will open
up and will not let voltage go to the clutch on your ac compressor. you can pull off the switch, turn on your ac on high, get a paper clip or jumper wire, and jump the molex if your compressor comes on and
your car starts to cool,check the switch it may not be seated all the way, its a normally closed switch,
if you read across the switch with an ohm meter you should get a closed loop,when the ac is turned off,
you can remove it to test it without pulling the freon. if its open the clutch will not work, also check the
molex with a test light while it is on the switch,with ac on if it shows voltage on and off you could have
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Aug 03, 2011 | 2001 Mitsubishi Montero Sport 4WD

4 Answers

A/C is blowing hot air. Freon is full, compressor


Not sure how you know if the freon is full without the unit running. There are a number of switches which can keep your A/C from coming on. There is a low pressure switch which is usually located on the larger line and sometimes located on a silver cannister (called an accumulator) which is the low side of a compressor circuit. There is also a high pressure cutout which is usually located on the back of the compressor unit. Both of these switches can be jumpered out to see if they are the reason for the compressor not working. You remove the two wire connector to either switch and place a small jumper wire between the two wires on the connector block. The other reason my be a low idle cutout switch and this will also usually be located near on on the compressor. You can also test it the same way as the other switches. If it is the low pressure switch then of course you will need to add freon which you can purchase from any auto parts store. They usually come with instructions and all the equipment needed to add in freon. If it is high pressure, then some of the freon should be recovered from the system by a technician. If is the low idle cutout then you will have to take it to a mechanic to understand why it is idling so low. Hope this helps.

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1 Answer

Air conditioner not blowing cold air. We put coolant with gauge reading 25 lbs pressure. We think the compressor is coming on. The pipe coming out of the compressor is cool but, the air coming into the car...


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start car.turn on air conditioner high cool .raise hood look to see if the compressor clutch is engaged and running.if yes your ac air door could be stuck closed or the air door vacuum actutator not receiving vacuum.a vacuum line is broken or off. or the control switch bad.that control the AC and heater mode. if compressor clutch is not engagged.check for power at compressor clutch.if yes compressor clutch coil open. or the air conditioner refrigerant R 134 is low take car to a private garage with a good reputation. they wont be expensive as the dealership.have them hook car air conditioner to a manifold gauge set to check your refrigerant low side and high side pressure.

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1 Answer

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By pass both pressure switches one at a time with small wire or a paper clip. If comperssor kicks on replace the swich that you bypassed.
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1 Answer

My A/C stopped working on my 1995 Accord Ex. It'll sometimes start blowing cold air, then just blow hot air. Took it to the shop, and they said it's a electrical prob., cause the system has gas and when...


On most car aircon systems there is a high pressure switch built into the system. This is a small switch usually with two wires threaded into the metal pipe near the dryer/condenser. This switch is only there incase the pressure gets to great in the system it shuts the compressor off.
Sometimes these can be faulty and turn on and off when the feel like it. They are not that dear about $50.

Easy way to check if thats the problem is to find the switch disconect the plug with the two wires on it start the car and put on the aircon. Using a small piece of wire bridge the two wires in the plug together. If this is the problem you should hear the clutch on the compressor engage every time you touch these wires together. If you can let go of the plug with the wires joined and without it touching on any metal and go check inside the car for cold air.

Hope this helps.
Cheers

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1 Answer

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