2003 Pt Cruiser Ac Problems
Posted June 16, 2006 at 10:59 am
About 2 weeks ago the car would make some aweful noises and would shudder at idle when the AC was on. If you reved the car up in neutral and let off the car would stall and freeon would blow out of the high pressure valve. Well I took it to my brother in law (he is an ASE certified mech), he said that there is probably a blockage. Well we drained the system and check the lines and found that they all seemed to be clear. Then he tells me that my radiator fan is probably not comming on when its supposed to so the freon is not cooling off correctly and therefore not moving through the system like it should. This seemed to make sense to me because when I got on the freeway (which is most of my driving) the AC would work fine. So I take it to a local shop so they can recharge the system, and I also ask them to run a diag on it just in case. They tell me that the entire AC system works fine and that it must be an electrical issue. Well after looking over a ton of service manual stuff I found that the only thing that turns on the radiator fan is a combination of inputs from the speed sensor and the temp of the engine coolant. Well I had the headgasket replaced recently and I found that they replace the coolant with a 100% coolant mix; no water. So of course this would effect when the fan kicks on becuase coolant takes longer to heat up. Well so I figure I could just drain some coolant and add some water and problem solved. Not the case. yesterday I'm on the freeway and the AC is just blowing air not much cooler than ambient. So now I'm wondering if my compressor took a crap or if there really is a blockage that the shop did not detect. Is therre anyway that I can diag this myself with having to discharge the system? and should I take it back to that original shop and explain to them that their original diag was incorrect? I think this is a new issue unrelated to the first, however I don't want to have to pay the cash I think its going to cost to fix.
Posted June 16, 2006 at 11:35 am
Edited by AllanC, June 16, 2006 at 11:37 am.
Posted June 16, 2006 at 12:01 pm
Posted June 16, 2006 at 12:28 pm
I think you'll find that, one way or another, the ECM turns on a cooling fan whenever the A/C compressor is on, for just about any MoPar in the last 15 years. Check your wiring diagrams again carefully.
The transducer is only on the turbo models.
Posted June 16, 2006 at 01:55 pm
Radiator fan operation is control by the Powertrain
Control Module (PCM) with inputs from the temperature
of the coolant, which is sensed by the coolant
temperature sensor, and vehicle speed which is measured
by the vehicle speed sensor. The PCM turns on
the fan through either the high or low speed fan
relay. The PCM provides a ground to the relay’s control
circuit. The fan relays are located in the Power
Distribution Center (PDC) (Fig. 27). Refer to the
label beneath the PDC cover for location of fan
Refer to Radiator Fan Operation Chart for fan
operation specifications. For fan circuit wiring diagrams,
refer to WIRING DIAGRAMS."
here is the Radiator fan operation chart
RADIATOR FAN OPERATION CHART
Radiator Fan Control
Low Speed High Speed
A/C Off –vehicle speed < 70.8 km/h (44 mph)
Fan On: 96.6° C (206° F) 103° C (219° F)
Fan Off: 92.7° C (199° F) 98.8° C (210° F)
A/C Off –vehicle speed > 70.8 km/h (44 mph)
(until vehicle speed drops below 58 km/hmph)
Fan On: Off 103° C (219° F)
Fan Off: Off 98.8° C (210° F)
A/C On –any vehicle speed
Fan On: Off 82.2° C (180° F)
Fan Off: Off 80° C (176° F)
Posted June 16, 2006 at 02:27 pm
Posted June 16, 2006 at 02:31 pm
Edited by AllanC, June 16, 2006 at 02:33 pm.
Posted June 16, 2006 at 05:14 pm
To answer the previous post...I have one fan.
As far as hearing the door...my sense of hearing is less than par, so I can't really tell. When I know what is going on for sure or if we get stumped I'll post again. This car has been one headache after another.
Posted June 16, 2006 at 07:25 pm
Posted June 16, 2006 at 11:51 pm
Posted June 17, 2006 at 12:14 pm
Posted June 17, 2006 at 07:50 pm