Question about 1999 Chevrolet Malibu

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1998 chevy malibu i need to find the low pressure valve on the air conditioner so i can put some r134a in it

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Behind engine at firewall. directly behind coilpack just a bit lower.

Posted on Jul 25, 2008

  • beyashusband Jul 25, 2008

    can you tell me where the low pressure switch is?



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Compressor cycling too fast

you cant guess at the pressure in the system. and its not a good idea to bleed off any r134a. it is now known to be a powerful green house gas. so should be recovered. however its easy to see what the pressure is. there are low cost gages that come with some r134a kits. that will likely tell you the pressure is low. typically that's what causes the compressor to cycle. there is likely a leak somewhere .. the r134a molecule is very small and its hard to keep things from leaking. you can use soapy water around the crimped rubber hose ends and connectors. that's what usually leaks. there are two ports on the air conditioner .. a high pressure and a low pressure .. the low pressure port is what you add fluid into. its just a valve similar to a tire valve. if you were to push the valve open then refrigerant will vent just like a tire .. but don't ever do that with your finger. it will freeze. unfortunately you will also be venting oil that flows along with the fluid. that can damage your system. if you vent too much then your system will have to be put on a vacuum pump to start over.
1. check for leaks with soapy water. look for bubbles while the system is running. look for oily spots that might indicate a leak.
2. check the low pressure side for proper pressure. chances are it will be low indicating not enough r134a
3. repair whatever is leaking before refilling. use the gage to determine when properly filled.

the system has a pressure switch that makes sure their is always enough pressure on the low pressure side. that's because if the pressure gets too low there is danger of sucking in air and that will damage the system. so if the pressure gets below a set value then it shuts off the compressor. the pressure builds back up and the compressor comes back on then again the pressure drops as the system builds up. that's why it cycles fast . there is not enough fluid to keep minimum pressure while operating. if you have too much r134a then typically it will work but will probably blow out a hose. adding fluid to a leaking system will only make it work until it leaks back out .. sometimes that can last a year or a day, depending on how bad the leak.

May 12, 2014 | 1997 Chevrolet Blazer

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I cannot find the place to put r134a in my 1998 Chevy malibu ls

Follow the Accumulator (round silver cylinder) low pressure hose to the fire wall. You will find the low pressure service port valve just before the fire wall.

Make sure you don't over charge the system, add small amount at a time and check the temperature every 3 min to 5 min by placing the A/C on max with the engine at 2000 RPM.

Once the temperature coming out of the vents are cold as ice with the engine at 2000 RPM. stop charging. So turn the recharge valve on for 20 seconds and then off then rev the engine to 2000 RPM for 3 min and check the temperature at the vent.

Once the temperature is ice cold, stop and don't over charge the system. Over charging the system will cause the A/C compressor to shut down and at worst break, causing a $500.00 repair cost.

Good luck and thank you for using fixya.

Sep 08, 2010 | 1998 Chevrolet Malibu

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Need to recharge 2003 chevy malibu air conditioner. where do i find the intake to recharge it.

under the hood there is two a/c valves, one says H for high side and one says L for low side... hook up to the low side and turn the a/c on max with the car running and then charge. you really need a pressure gauge to know how much to put in. too much freon will make it blow hot also, you need the right amount of pressures, just go slow filling it up and keep checking the a.c temp out of the vents.

Jul 11, 2010 | 2003 Chevrolet Malibu

2 Answers

Low side on ranger for the port on the ac

hmm ..if you are looking for the low side air conditioner port .. then locate the condenser (thats in front of and looks like the radiator) .. you will notice two tubes going to that is large the other small .. the small tube is the high pressure side .. the large tube is the low pressure side ... follow the large tube back until you find a cap that covers the low pressure port .. thats where you would fill with new refregerant (r134a) .. if you buy r134a, you can also get a filler hose and gage.. that hose will only hook up to the low pressure port wont fit the high pressure port ...

Jul 03, 2010 | 1994 Ford Ranger Supercab

1 Answer

Location of low side pressure value for a/c

low pressure line from the AC compressor, that is the larger line of the two lines comming from the AC compressor

Jun 26, 2009 | 1998 Chevrolet Blazer

1 Answer

1998 Chevy Malibu Fuse panel diagram

turn heater on nothing but cold air

May 29, 2009 | 1998 Chevrolet Malibu

1 Answer

Trying to put 134 a in a/c but don't know where to charge it

follow the air conditioner line from the front of the car. valve on the line will be near the front

Jul 01, 2008 | 1998 Pontiac Grand Am

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