Question about 2003 Chevrolet Impala

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Which is "low side" of ac on my 2003 impala with 3.4L

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  • Chevrolet Master
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On my 2002 Impala 3.8L the low port is back by the firewall and transmission dip stick. See picture:

which is - 380d07b.jpg

Posted on Jul 14, 2010

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  • Contributor
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It is the one coming from the firewall to the compressor, not the one going to the condenser coil at the front of auto.

Posted on Jul 12, 2010

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  • Chevrolet Master
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It is the smaller one of the two,the one hose charge hose you have will only fit the low side anyhow.

Posted on Jul 12, 2010

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  • Master
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THE HOSE NORMALY CLOSEST TO FIREWALL AND WITH THE small fitting FOR REFILL

Posted on Jul 12, 2010

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1 Answer

Recharge ac 2003 impala


if low charge buy freon charge can with hose and hook up to low side start vehicle let run with a/c on may take more than one can if replacement of a part have to evacuate system (run a vacuum pump ) to get rid of moisture first than can charge system the link shows the service ports on a 04 but same as the 03
Yahoo Web Search

Sep 30, 2015 | AC Cars & Trucks

1 Answer

On an ac system how do i check the high & low preasure switches and what do these switches operate and what is the purpose of them?


If your 2003 Impala had a low pressure switch it would shut off the compressor if the low side pressure got to low. This would indicate that there is not enough refrigerant in the system an therefore not enough oil flow through the compressor so the compressor is shut down.

The high pressure switch, if your impala had one, would turn on the fan once the a/c pressure on the high side reached a certain pressure.

Switches are just that, they are either on or off. A low pressure is normally on and a high pressure is normally off (this can vary greatly depending on the car).

Your impala uses a pressure sensor. The sensor reports actual pressure data to the PCM which combines info from other sensor to determine what should be turned on and when.

Hope that helps. If you have any questions let me know and I'll see if I can answer them for you.

Oct 09, 2011 | 2003 Chevrolet Impala

1 Answer

I have a 2007 impala. When you press the switch to turn on the A/C the light blinks and it won't come on. The temp. indicator on the dash is also showing -40.


This means there is a problem with the ac system,and clearing it you will have to find the ac fuse,and remove the fuse and then replace it after 20 seconds,then have the ac system checked to see if the freon is low,or another problem.

May 04, 2010 | 2003 Chevrolet Impala

2 Answers

AC Compressor not engaging on 2000 Chevy Impala. Fuses and AC relay okay. No power at compressor. Need wiring diagram. Also need to know if compressor requires 12v for operation. If not what should voltage...


When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.

Apr 20, 2010 | 2000 Chevrolet Impala

1 Answer

Driver Side ac Warm Passenger Cold


they actuator door is stuck or acuator motor is not working right sounds like it could be mixing warm air into get book at library and troubleshoot system!!! :)

Jul 06, 2009 | 2003 Chevrolet Impala

2 Answers

2000 impala cold passager and warm air driver side


there is an actuator for the drivers side heater that opens the temp door. this motor actuator needs changing. so it is stuck in heat mode and now motor will not move door to cold.

Jul 03, 2009 | 2003 Chevrolet Impala

1 Answer

Impala has dual climate control. AC blows cold on


with a dual climate control system, it is imperative for a proper refrigerant charge to be maintained. the symptom you describe is a possible indicator of low charge on the system. the ac evaporator core is closest to the right side of vehicle thereby making air feel cooler on that side, on the left side of the vehicle the cooled air has farther to travel and warms up from cabin air before it discharged from the vents. this is the most probable issue for your vehicle...however if the charge is accurate, the issue would be more so in the air temperature doors which is located deep inside the dash...i hope this helps...good luck!

Jun 09, 2009 | 2004 Chevrolet Impala

3 Answers

Recharge AC on my Chevy Impala 2003


You need to follow the ac lines from the ac compressor to the ac condensor to the fire wall behind the engine where it goes to the heater box.There are two connections,both at differant locations,a low side that has a screw on red or blue cap with the letter L on it and a high side with a cap that has the letter H on it.The refridgerant goes into the low side.Hope this helps.

Mar 10, 2009 | 2003 Chevrolet Impala

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