Question about 2003 Kia Sedona

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My airconditioner is blowing hot air. The mechanic said that the compressor is not broken. He needed to find the lower side pressure valve to kick the compressor on so it would stay on. Where is the valve?

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If it is the 3.5 litre it has a triple switch located on the top of the dryer that switch is actually the high pressure switch the low pressure switch and medium when the pressure is medium or you jump it than fans will kick on high he is right about the thermistor for the evaporator he should just apply 12volts to the compressor to see if the coil on the compressor is bad all three are common problems not knowing where the switch is makes me wonder if he even checked the relay or how he knows the compressor isnt bad

Posted on Jul 03, 2009

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It is not recommended to use recondition compressor because it won't last that long. It is more advisable to buy surplus or brandnew if you have enough budget. Ask for second opinion if the problem is really the compressor. It could be just the expansion valve. Expansion valve controls the amount of superheat at the outlet of the evaporator. This is accomplished by use of a temperature sensing bulb filled with a similar gas as in the system that causes the valve to open against the spring pressure in the valve body as the temperature on the bulb increases. As temperatures in the evaporator decrease, so does the pressure in the bulb and therefore on the spring causing the valve to close.

Posted on Jul 01, 2009

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If that mechanic cant find that dont let him touch your vehicle that means he dont know find a vehicle ac mechanic specialist

Posted on Jul 01, 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.

May 07, 2013 | 1995 Buick Century

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

1 Answer

A/c blowing hot air


Low side pressure should be 28-32 PSI, you have a big problem here, possible expansion valve issue.

Aug 31, 2012 | 2004 Hyundai Santa Fe

3 Answers

98 buick century AC blows cold air on passenger side and hot air on drivers side..when we recharged the unit, it worked cold air for a few days and now blowing hot air again.


Hi. There seems to be a blockage within the system. I will list all parts to be checked by your mechanical. I would also have the blend door linkages or servos inspected for fail points along with the listed areas of concern, below:

Loose or broken drive belt
Inoperative compressor or slipping compressor clutch
Defective expansion valve
Clogged expansion valve, receiver-drier or liquid refrigerant line
Blown fuse
Leaking component: any of the parts listed above or one of the A/C lines, hoses or seals.

Instruct your mechanic to check all the above, along with the dash blend door linkages for faults.

Aug 11, 2010 | 1998 Buick Century

1 Answer

The airconditioner on my 2002 cadillac seville sometimes works but most of the time it doesnt. when it does it blows cold air. what could it be


There could be a blockage in a screen called an orifice tube in the liquid refrigerant line. The refrigerant may not be circulating properly and this can cause a pressure out of range (too high) which can kick off the compressor until the pressure is no longer out of range. Another possiblity is the compressor is nearing the end of its life and gets too "hot" and kicks off. I have seen some that would "smoke" from the clutch failing before any thermal limits would kick off the compressor, so I sort of doubt that's the issue. Another possiblity is a loose drive belt, but that would ordinarily present a belt noise (loud squeal). Another possiblity is the alternator is failing and cannot deliver sufficient current to run the electrical devices that kick on when the AC is running. A parts store can check that for you for free!

Jul 25, 2010 | 2002 Cadillac Sts

2 Answers

04 Saturn Vue AC blows cool air for about one minute then hot air


Above solution is correct, had the same problem with mine and it was the expansion valve.

Jul 06, 2010 | 2004 Saturn VUE

1 Answer

Air conditioning compressor will not kick in,


If it is above 100PSI, you are over charged. Any thing under, should be normal to low. You probably need to get it checked by a professional to make sure it has the correct charge, and the compressor is getting power when the switch is turned on.

Jul 14, 2009 | 2003 Mitsubishi Lancer

1 Answer

Car ac malfunctioning


/Does the compressor kick in compressor or the compressor clutch might be shot

Feb 05, 2009 | 1998 Honda Civic

3 Answers

A/C blowing hot air. Compressor activates and system has pressure.


Could be the expansion valve. That's what allows the temperature to actually drop in the system - the contents of the AC system are under pressure, and are at a certain temperature. When the freon goes through the expansion valve, the pressure drops suddenly and dramatically, which "flash chills" the freon, allowing the air to blow cold. If it fails, you may get lukewarm air from the AC despite everything else working. Also though, check to see whether the AC evaporator fan (underhood) is working - on some cars, if it doesn't turn on, the compressor won't be run enough to cool the air.

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1 Answer

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Check to see if your system is charged. there is a pressure plug with a green cap near the right side motor mount. If you have pressure then check fuze under hood and see if compressor is kicking in. If not charged it will not kick in.

Jul 22, 2008 | 1999 Pontiac Sunfire

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