Question about 2005 Saturn VUE

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05 vue ac problem, ac not cold at idle, blows cold while driving, had checked freon is full, expansion valve was replaced, because high side flutters and low side does same. seems that compressor doesnot cycle,with gauges low side doesnot come down low enough to allow compressor to cycle. have any ideas

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  • cheap repair Oct 02, 2010

    is the radiator fan coming on with the AC?

  • jlk_enterpri Oct 03, 2010

    yes ac and cooling fans are on, only low pressure flutters after engine is revived up and starts to go up.

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  • Master
  • 1,190 Answers

Hello, Are the cooling fan(s) coming on with the truck in park and the engine at idle? If the cooling fan(s) are not working A/C will not cool with truck setting still.

Posted on Oct 02, 2010

  • cheap repair Oct 03, 2010

    have you cleaned or replaced the cabin air filter?

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2 Answers

AC NOT WORKING PROPERLY


You've got some of the picture, but not all of it.
You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere.
The hissing noise is freon flowing thru the system which could also indicate a low charge.

Apr 22, 2013 | 2009 Buick Enclave

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Where is the expansion valve located on the 2004 KIA Sedona


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Sep 12, 2012 | 2004 Kia Sedona

1 Answer

Ac blows cold air for about 15 minutes then starts blowing warm air then starts blowing cold air again freon is full


Freon is not full. If it goes back and fourth it is pumping then reaching a low pressure on the low side below 35 psi. Pressure while car is off should be pegged. Check at idle should be around 50 psi and 35 psi at 2000 rpms.

Good luck. If problem persists evac system replace dryer and recharge.

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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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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

2 Answers

2004 SATURN VUE HAS PROBLEM BLOWING COLD AIR WHEN SITTING IDLE. IT WILL COOL IF I AM DRIVING AND GIVING IT GAS CONTINUOUSLY. FREON OK. CHECKED OUT BY MECHANIC WHO REPLACED THE "EXPANSION VALVE". STILL...


did you check if the cooling fans are working? this is very important, because they lower the pressure of the freon before passing throughout the expansion valve and getting into the evaporator,more pressure means highter temperature, , of course when you are driving the air flow throughout out the condenser lowering the freon temperature in the condenser and lowering the freon pressure at the high side, tha's way the temperature inside the car is lower ... you can have a similar problem if the condenser is partially plugged..hope this was very helpful...

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1 Answer

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If you tried using a refrigeration "sealing" product before changing out the compressor, you most likely do need to replace the expansion valve.

The valve "flutters" open/close/open/close/etc/etc when in operation. The purpose is to allow the compessor to build up enough pressure to change the freon to a gaseous state. Once you put in the sealer, the valve becomes plugged with the product and cannot seat completely. After this happens, you never get a full phase change because the pressure cannot build up enough. You will experience reduced cooling. Change the Exp. valve and you'll be set. In the future, it is not advisable to ever use the sealer products as this can cause damage to other system parts, and especially the recovery units at the shop.

Jul 30, 2009 | 1999 Dodge Durango

1 Answer

1999 Dodge Ram AC blows cold at idle and up to 40 mph


Most likely the orifice tube/expansion valve needs to be replaced. Depending on the type of system, you will have one or the other but they both perform the same function. The expansion valve is typically located at the evaporator inlet. Orifice tubes can be located at the evaporator inlet, in-line between the condenser and the evaporator, or in the condenser outlet. You will have to discharge the system in order to replace. Not very hard to do.

Jun 08, 2009 | 1999 Dodge Ram

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