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Joined: Sep 2004
Posts: 5
Newbie
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OP
Newbie
Joined: Sep 2004
Posts: 5 |
My wifes 98 contour GL 2.0 Ztech started blowing warmer than normal air from the vents in both normal and MAX A/C. I checked the pressures low side 48PSI and high side 290PSI. I noticed the compressor is not cycling, It stays engaged constantly when in either A/C setting. does anyone know if this vehicle's A/C compressor is supposed to cycle? I have read that some A/C systems use a variable displacment pump or other restrictions in liew of a cycling clutch. I thought every newer A/C system used the cycling clutch. My 97 escort does. thanks in advance. 
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Joined: Jan 2004
Posts: 392
CEG\'er
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CEG\'er
Joined: Jan 2004
Posts: 392 |
I'm not sure but I think that your high pressure is too high.
The compressor is suppose to cycle, it's not normal to be constantly engage.
Nic.
Contour 99 MTX V6 fully loaded, stock with 110000km. Illuminated sunroof switch. About to do the mystique rear dome light conversion with eyeball dome light.
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Joined: Jul 2001
Posts: 7,100
Addicted CEG\'er
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Addicted CEG\'er
Joined: Jul 2001
Posts: 7,100 |
PINPOINT TEST A: THE A/C DOES NOT OPERATE/DOES NOT OPERATE PROPERLY
A1: CHECK THE OPERATION OF THE A/C COMPRESSOR CLUTCH
A2: CHECK FOR MECHANICAL ERRORS
A3: CHECK THE A/C CYCLING SWITCH
A4: CHECK THE REFRIGERANT SYSTEM PRESSURE
A5: CHECK FOR VOLTAGE AT THE A/C CYCLING SWITCH - CIRCUIT 14S-CA17 (VT/OG)
A6: CHECK FOR VOLTAGE TO THE DUAL PRESSURE SWITCH - CIRCUIT 15S-FA38 (GN/RD)
A7: CHECK THE DUAL PRESSURE SWITCH
A8: CHECK CIRCUIT 15S-RE9 OR 15S-RE9A (GN/BU)
A9: CHECK THE A/C CYCLING SWITCH C692 FOR OPEN
A10: CHECK CIRCUIT 15-FA12 (GN/BU) FOR VOLTAGE
A11: CHECK CIRCUIT 15-FA11 (GN/YE) FOR OPEN - PCM CONNECTED
A12: CHECK THE CIRCUIT 15-FA11 (GN/YE) FOR OPEN
A13: CHECK THE CIRCUIT 91S-FA11 (BK/YE) FOR OPEN
A14: CHECK THE A/C WOT RELAY
A15: CHECK THE VOLTAGE TO THE A/C CLUTCH SOLENOID - CIRCUIT 14S-CA6 (VT/YE)
A16: CHECK THE VOLTAGE TO THE A/C COMPRESSOR CLUTCH DIODE - CIRCUIT 14S-CA7 (VT/BU)
A17: CHECK THE A/C COMPRESSOR CLUTCH DIODE GROUND FOR OPEN - CIRCUIT 31-CA7 (BK)
A18: CHECK THE A/C COMPRESSOR CLUTCH DIODE
A19: CHECK CIRCUIT 31-CA6 (BK) FOR OPEN
A20: CHECK THE AIR DISTRIBUTION CONTROL SWITCH FOR VOLTAGE - CIRCUIT 15S-FA13 (GN/RD)
A21: CHECK CIRCUITS 15S-FA17, 15S-FA17A (GN/OG) OR 14S-CA17 (VT/OG) FOR OPEN
A22: CHECK CIRCUITS 15S-FA13 (GN/RD) FOR OPEN
Step A4 states that if the pressure is higher than 50PSI on the high side (after A1 A2 and A3 are verified to be in working order) then replace the A/C Cycling switch, as seen below:
Connect gauge set to port. High side reading must be above 169 kPa (50 psi).
l Is the high side pressure above 169 kPa (50 psi)?
�¨ Yes
INSTALL a new A/C cycling switch. TEST the system for normal operation.
�¨ No
CHECK and REPAIR the refrigerant system for leaks or low charge or incorrect A/C compressor clutch air gap. TEST the system for normal operation.
I know there are a ton of tests on that list, but I will be ready to elaborate more on any tests you come to, if need be.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Joined: Sep 2004
Posts: 5
Newbie
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OP
Newbie
Joined: Sep 2004
Posts: 5 |
thank's for the valuable diagnostic check list. I will start sorting out the problem shortly starting with the most likely.
Thanks Again for the help.
Dean
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Joined: Feb 2001
Posts: 2,163
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Feb 2001
Posts: 2,163 |
How much should all of this cost Ray
"PINPOINT TEST A: THE A/C DOES NOT OPERATE/DOES NOT OPERATE PROPERLY
A1: CHECK THE OPERATION OF THE A/C COMPRESSOR CLUTCH
A2: CHECK FOR MECHANICAL ERRORS
A3: CHECK THE A/C CYCLING SWITCH
A4: CHECK THE REFRIGERANT SYSTEM PRESSURE
A5: CHECK FOR VOLTAGE AT THE A/C CYCLING SWITCH - CIRCUIT 14S-CA17 (VT/OG)
A6: CHECK FOR VOLTAGE TO THE DUAL PRESSURE SWITCH - CIRCUIT 15S-FA38 (GN/RD)
A7: CHECK THE DUAL PRESSURE SWITCH
A8: CHECK CIRCUIT 15S-RE9 OR 15S-RE9A (GN/BU)
A9: CHECK THE A/C CYCLING SWITCH C692 FOR OPEN
A10: CHECK CIRCUIT 15-FA12 (GN/BU) FOR VOLTAGE
A11: CHECK CIRCUIT 15-FA11 (GN/YE) FOR OPEN - PCM CONNECTED
A12: CHECK THE CIRCUIT 15-FA11 (GN/YE) FOR OPEN
A13: CHECK THE CIRCUIT 91S-FA11 (BK/YE) FOR OPEN
A14: CHECK THE A/C WOT RELAY
A15: CHECK THE VOLTAGE TO THE A/C CLUTCH SOLENOID - CIRCUIT 14S-CA6 (VT/YE)
A16: CHECK THE VOLTAGE TO THE A/C COMPRESSOR CLUTCH DIODE - CIRCUIT 14S-CA7 (VT/BU)
A17: CHECK THE A/C COMPRESSOR CLUTCH DIODE GROUND FOR OPEN - CIRCUIT 31-CA7 (BK)
A18: CHECK THE A/C COMPRESSOR CLUTCH DIODE
A19: CHECK CIRCUIT 31-CA6 (BK) FOR OPEN
A20: CHECK THE AIR DISTRIBUTION CONTROL SWITCH FOR VOLTAGE - CIRCUIT 15S-FA13 (GN/RD)
A21: CHECK CIRCUITS 15S-FA17, 15S-FA17A (GN/OG) OR 14S-CA17 (VT/OG) FOR OPEN
A22: CHECK CIRCUITS 15S-FA13 (GN/RD) FOR OPEN
Step A4 states that if the pressure is higher than 50PSI on the high side (after A1 A2 and A3 are verified to be in working order) then replace the A/C Cycling switch, as seen below:
Connect gauge set to port. High side reading must be above 169 kPa (50 psi).
l Is the high side pressure above 169 kPa (50 psi)?
�¨ Yes
INSTALL a new A/C cycling switch. TEST the system for normal operation.
�¨ No
CHECK and REPAIR the refrigerant system for leaks or low charge or incorrect A/C compressor clutch air gap. TEST the system for normal operation.
I know there are a ton of tests on that list, but I will be ready to elaborate more on any tests you come to, if need be.
Ray "
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Joined: Oct 2002
Posts: 2,408
Hard-core CEG'er
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Hard-core CEG'er
Joined: Oct 2002
Posts: 2,408 |
Originally posted by Mr. Kamen:
My wifes 98 contour GL 2.0 Ztech started blowing warmer than normal air from the vents in both normal and MAX A/C. I checked the pressures low side 48PSI and high side 290PSI. I noticed the compressor is not cycling
Both pressures are high, this would normally indicate that freon was put in the system when not needed (for instance because the temperature air door quit closing completely causing some heat).
And yes, it won't cycle if the low side stays above about 27 psi.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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