Automotive Air Conditioning Information Forum (Archives)

Mopar4u on Mon May 27, 2013 10:39 AM

Year: 1999
Make:
Engine Size: 2.0
Refrigerant Type: 134a

99 neon sport 163000 miles dohc

Previous owner said they add 134a every summer and the ac lasts through the summer. I bought the car a couple weeks ago and the ac didn't work (hasn't been charged for this summer). I want to find the leak and fix. So I bought a manifold set, dye, and 2 12oz cans 134a. Without the car running there was a little pressure in the system. Turned car on and cranked the ac. So I put my 134 on the service line and opened the low side (blue) and in it went. Fans were running and engine rpms changed but I don't recall the compressor ever kicking in at first (don't really remember). Low side (blue)pressure kept climbing, I hit 70psi and stopped adding. High side (red) barly got over 60psi. In the end the clutch definitely wasn't kicking in. No cold air blowing. Do I need to start diagnosing the compressor clutch? Fuse is good. That's where I ran out of daylight. What next?

WyrTwister on Tue May 28, 2013 9:51 AM

Try testing to se if you are getting 12 VDC at the cable / connector that plugs into the clutch coil .

Take an ohm meter and measure the resistance of the clutch coil . I do not know what that value should be , but some one here should ?

If you have no 12 VDC going to the clutch coil , find the relay that activates the clutch coil & look for problems . Often , you can find that same relay model used for a different task . If so you can try swapping the relays & see what happens ( do this with the vehicle off ) .

I usually have a Hayes or Chilton manual for my cars , with a wiring diagram . I have been known to jumper around a relay , with the car off , to check the clutch . I do not know if you feel confortable doing this , or not ?

God bless
Wyr