Question about 2001 Plymouth Neon

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Tring to add freon where is low presure switch

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Follow the large low pressure line coming from the firewall,going into the passengers compartment under the windshield ,it will have the low pressure service port on it,and it is the only service port the service hose you have will fit.

Posted on May 09, 2010


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1 Answer

Ac clutch not kicking on

ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.

Jul 22, 2012 | 1991 GMC K2500

2 Answers

Ac compressor cuts on off just had a new one put ,on is it because its low on refridgerant

It could be low on freon or it could be a bad low pressure switch located at or by the accumulator or
ac dryer, if you have a ready made gauge, it will have a gauge,hose and can of freon, it can be closed,
the can can be empty, you just want to make sure there is freon pressure at the low pressure switch. once confirmed and you know there is normal freon pressure, proceed by setting your ac to high,pull off the low pressure switch molex and connect a jumper wire across it, if the ac clutch stays engaged and
the car starts to cool, just replace the low pressure switch, you do not have to pull the freon out to replace just make sure the seal is lubricated with the correct pag oil. if you just had the compressor, replaced you could also have a freon leak. good luck!

Aug 04, 2011 | 1999 Mercury Cougar

2 Answers

Where do you put the freon?

low presure side of system, near usually under a blue plastic cap

Aug 03, 2011 | 1997 Chevrolet Lumina

1 Answer

My AC wont blow cold. As soon as I put freon in it, it blows cold for about an hour, then hot again. My friend told me that the orifice tube in his car needed to be replaced because it was convertine the...

Sounds like you might have a leak. If you charge the system and works for a time ,(hour, week, year) and then quits it sounds like perhaps the freon is leaking out somewhere. Freon does not ever get converted to air. Freon is in several states of existance while it is in your system. It is a high presure liquid, high presure gas, low presure liquid, and a low presure gas, but it is still always freon.
The valve your friend is talking about is called an expansion valve. What it does is to take the high presure "liquid" freon and allows it to pass into a low presure zone called an evaporator at a regulated rate. When you take freon at a liquid state high presure condition and expose it to a low presure environment it "evaporates" ( thus the name evaporator) and it gets very cold when it does this. This is where the cold air you feel coming out of the vents is made.
But the freon is in an enclosed system. By this, I mean it is never exposed to air, moisure (water), or anything else. I goes through all of these changes while inside this enclosed system.
Therefore, if the enclosed system is good then the amount of freon inside it will not change. If the amount of freon doesn't change then adding more will only make things worse.
I would suggest having the system checked with a hologen leak detector and/or system dye to find the leaks. Remember, if you have to add freon, then the freon that was there before must have escaped from somewhere.
Find a reputable shop to check the system for leaks. If it is leaking bad enough to run low in a hour it should be an easy to find leak.

Apr 13, 2011 | Chevrolet Cobalt Cars & Trucks

1 Answer

1989 GMC sierra 1500 AC not working. what to check first ?

freon first, then low and high presure switchs,but if it low on freon you have a leak and needs to be repaired

Aug 24, 2010 | 2002 GMC Envoy

1 Answer

Fan not blowing on air condition

The fan will not run untill the relay kicks the A/C on.The system is low on freon not allowing the presure switch to close aloowing the relay to power the fan.Add some 134A freon to the system!

Aug 05, 2010 | 1995 GMC Safari

1 Answer

My air conditioner isn't working blowing hot air

First check the fuses / relays then if good more than likley the system is low on freon.If the system is low nothing would work either.The 1999
system uses 134A Freon which you can get without a certificate at many local parts stores.Install the freon on the low presure side!

Aug 05, 2010 | 1999 Chevrolet Blazer

2 Answers

The AC unit doesn't come on anymore


Nov 10, 2009 | 1999 Ford Escort

3 Answers

I have a 1995 chevy camaro z-28 with the lt-1 350 engine. How do i get the compressor to engage so i can install freon?

It is illegal to dispense freon, unless you are licensed; however, if the system has been converted to R-134 then:
1. Purchase the refrigerant from AutoZone and "borrow" the vacuum pump and the manifold (guages) free.
2. Evacuate the system (read directions) and verify that the vacuum will hold.
3. Charge system through th emanifold.
4. The compressor will start when enough refrigerant pressure is present.

Oct 12, 2009 | 1995 Chevrolet Camaro

1 Answer

I have a 99 chevy suburban and i dont know witch

most of the time this wont be the case ,,,this has a ht6 compressor,bad to leak,,look for low freon levle and check low presure switch and high presure switch and connector,high side switch is on back of compressor,check to see if bad connector or bad switch/these are in series with one another ,before clutch activation

Jul 05, 2009 | Chevrolet C1500 Cars & Trucks

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