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Repair AC Dodge Neon

stu22180 on Wed June 15, 2011 1:01 PM User is offlineView users profile

Year: 1999
Make: Dodge
Model: Neon
Engine Size: 2.0
Refrigerant Type: R134A

I am trying to repair my AC in a 99 Dodge Neon. I am a newbi to AC repair. Here is what I know it's AC system. It has some R134a in the system and dose not have a leak. But the compressor will not trun on. I can start the Compressor by closeing the low relay. How can I trobleshot the system more.
Thanks

HVACNY on Wed June 15, 2011 1:46 PM User is offline

You should get yourself some guages and then we can help you troubleshoot your system properly,without the guessing. They sell them on this site.

Edited: Wed June 15, 2011 at 1:46 PM by HVACNY

mk378 on Wed June 15, 2011 1:50 PM User is offline

When you jumped it, do you remember did it get cold? Don't try that again though because you can damage things by forcing the compressor to run.

stu22180 on Wed June 22, 2011 9:14 PM User is offlineView users profile

Now I have gages... The low side is 60 and the high side is 0, car not tuning and no AC. If i start the car and jump the relay. The high side can go up to 100. No cold air or hoses or hot hoses. What's next.
Thanks
Stu

Edited: Wed June 22, 2011 at 9:30 PM by stu22180

bromodragonfly on Wed June 22, 2011 11:03 PM User is offlineView users profile

You will want to clarify your readings a bit

Static pressure when the AC is off - low side is 60 and high side is 0? Just want to confirm this - I would've expected them to be equal.

Pressure when compressor turns on (when you jump the switch) - high side pressure rises from 0 to 100, and low side falls from 60 to.....?


If I were you, I would start out by evacuating/recovering all refrigerant in the system. Pressure/leak test. Vacuum. and add the correct charge of R134A.

Are you putting power directly to the clutch relay? Or jumping out the low pressure switch?

If you're jumping the low pressure switch and the compressor turns on, I'm guessing that the system is low on refrigerant. The only thing I am confused about is that the compressor does not engage at all, even with 60psi on the low side at static. I would've expected it to turn on for a second or so and then cut out.

-------------------------
There is no knowledge that is not power

stu22180 on Thu June 23, 2011 8:35 AM User is offlineView users profile

Let try clarify readings a bit... Please bare with me I am new to AC Repair.

Static pressure was low side 60 and high side 0. "Car not running."

Started the car and Jump the low side relay with my finger. Pressure was low side 60 and high side came up a bit maybe 30.

I thought maybe it's just to presser low on high side. So I added a little to the high side with the car off. Now making both sides about 60 "Static pressure". Now I started the car and jumped the relay with my finger. The pressure went up to about 100 on the high side and the low side stayed at 60.

mk378 on Thu June 23, 2011 10:24 AM User is offline

60 psi static pressure in the summertime is basically an empty system.

stu22180 on Thu June 23, 2011 11:10 AM User is offlineView users profile

So what is the next step???? Pull a vacuum and watch for leaks...
Then leaks add R134A... I am new to AC systems, I was thinking that there clog some where in the system with Static pressure was low side 60 and high side 0. "Car not running." I thought the static pressure should be the same high side / low side.
Help
Stuart

bromodragonfly on Thu June 23, 2011 5:38 PM User is offlineView users profile

Yeah or it's low static because it's 60 degrees outside, lol.

I don't know how you get an increase on your high side without a decrease on your low side when your compressor engages. I also don't know why the system isn't equalizing when the car is off for more than a few minutes.

Are you sure your gauges are good? Open the manifold when the car is off, see if static pressure will equalize through your hoses.

You can either throw in some R134A, get above that LPCO setpoint, and see what happens. Or you can take everything apart, clean everything up, and start fresh.

-------------------------
There is no knowledge that is not power

JJM on Thu June 23, 2011 9:28 PM User is offline

I don't see how you can have zero on the high side when the system is off and 100 when the system is running, coupled with no change in the low side pressure.

Have you used R-134a with sealers or conditioners? What is the A/C service history on the vehicle, if known?

Joe

When considering your next auto A/C purchase, please consider the site that supports you: www.ACKits.com



stu22180 on Sat June 25, 2011 4:42 PM User is offlineView users profile

I know the gauges are good. I tried them on a known good car and they worked just as they should. We have had the car for about 3 year and the AC never worked from day one. I have never pulled a vacuum or added R134a to the system till now.

wasp on Sun June 26, 2011 9:12 AM User is offline

First gen neons are *notorious* for bad condensers. If you're into junkyarding I suggest looking for a neon with a tube-type parallel flow condenser. They're hard to find but they're out there. Or a new condenser is only ~120 anyway.

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