A/C blowing hot air

[Whatwhat]

I have a 1992 buick park avenue. I replaced the compressor last winter. Now, when I start the A/C, it's blowing hot air, looks like the A/C does not work. I sent the car to an auto store, they told the compressor works and R134a is full. Maybe something wrong with the electonic system. How can I found the reason caused the problem?

[volkerc]

Originally Posted by Whatwhat

I have a 1992 buick park avenue. I replaced the compressor last winter. Now, when I start the A/C, it's blowing hot air, looks like the A/C does not work. I sent the car to an auto store, they told the compressor works and R134a is full. Maybe something wrong with the electonic system. How can I found the reason caused the problem?

you could check with the diagnostic mode, or simply try disconnecting the battery for 2-3 minutes, might reset itself.

[tman]

does it get cold at all?

Does it have the automatic climate control? (By this i mean is there only buttons, or are there sliders?)

With the automatic unit(all buttons) you need to press both auto buttons to get AC. the upper left corner auto, and the auto in the middle of the fan speed buttons.

[Whatwhat]

Thanks man. There are buttons only. I got a code 66. Could you tell me what's that means? Another thing is when I press the AUTO button, It always switch to ECON.

Thanks

[yogi_123rd]

Diagnostic Mode of the Climate Control System:

This method uses several common commands in all stages of the "menus" :
"HI" = proceed forward
"LO" = move backward
"WARM" = up
"COOL" = down
"OFF" = back one level
"AUTO" = exit ECC diagnostics/override function.

1) With the key in "run"
2) Press"off" and "warm" at the same time on the control head.
3) First, it will check all the segments.
4) Then codes will display.
"00" idicates that no codes are present. A "1" prefix indicates
that the code is history, not current.
5) There are too many codes to list, but look for a 41 or 141 - this is
the passenger side air mix actuator circuit. If this code is present, you
can narrow your diagnostics down considerably. Whatever codes you get,
write them all down and then post what you found here.



AC/Climate Control problem codes:

DTC code Description

DTC 10/110 Ambient Temperature Sensor CKT Open or Shorted
DTC 13/113 In-Vehicle Temperature Sensor CKT Open or Shorted
DTC 15/115 LH Solar Sensor Circuit Open or Shorted
DTC 35/135 E & C Data Line Failure With Heater and A/C Control Assembly
DTC 38/138 Serial Data Line Failure With PCM
DTC 40/140 Driver Air Mix Motor CKT Open or Shorted, or Not Calibrated
DTC 48/148 Long Term Freon Loss
DTC 52/152 Keep Alive Memory Lost: Sets With Battery Disconnected
DTC 66/166 Low Freon

NOTE: A number 1 prefix on any diagnostic trouble code indicates a history DTC.

This indicates no freon (more than likely a leak somewhere in the system), and a faulty calibration of an air mixer. The 52 will set if the battery is disconnected and is no big deal. You will need to find and correct the reason for no freon before you can procede.

[HotZ28]

Check to see if the compressor clutch is engaged with the air turned on. If it is, you should be able to feel the low side line getting cold. If the low side line is cold, you would have blender door problems, if the line does not get cold, you are low on freon. If the compressor chutch does not engage, it could be low freon, or electrical problems. If it is just low on freon, you can jump the low pressure switch to see if the compressor engages, if it does, get some R12 installed. Do not run with the low side switch jumped very long.

[yeubanc]

I have the same problem; I get error codes 134 and 135; what does this mean? The A/C runs, but only the drivers side is really cold, then within minutes the systems shifts over to ECON and stays there...?

Originally Posted by yogi_123rd

Diagnostic Mode of the Climate Control System:

This method uses several common commands in all stages of the "menus" :
"HI" = proceed forward
"LO" = move backward
"WARM" = up
"COOL" = down
"OFF" = back one level
"AUTO" = exit ECC diagnostics/override function.

1) With the key in "run"
2) Press"off" and "warm" at the same time on the control head.
3) First, it will check all the segments.
4) Then codes will display.
"00" idicates that no codes are present. A "1" prefix indicates
that the code is history, not current.
5) There are too many codes to list, but look for a 41 or 141 - this is
the passenger side air mix actuator circuit. If this code is present, you
can narrow your diagnostics down considerably. Whatever codes you get,
write them all down and then post what you found here.



AC/Climate Control problem codes:

DTC code Description

DTC 10/110 Ambient Temperature Sensor CKT Open or Shorted
DTC 13/113 In-Vehicle Temperature Sensor CKT Open or Shorted
DTC 15/115 LH Solar Sensor Circuit Open or Shorted
DTC 35/135 E & C Data Line Failure With Heater and A/C Control Assembly
DTC 38/138 Serial Data Line Failure With PCM
DTC 40/140 Driver Air Mix Motor CKT Open or Shorted, or Not Calibrated
DTC 48/148 Long Term Freon Loss
DTC 52/152 Keep Alive Memory Lost: Sets With Battery Disconnected
DTC 66/166 Low Freon

NOTE: A number 1 prefix on any diagnostic trouble code indicates a history DTC.

This indicates no freon (more than likely a leak somewhere in the system), and a faulty calibration of an air mixer. The 52 will set if the battery is disconnected and is no big deal. You will need to find and correct the reason for no freon before you can procede.