1987 Climate Control Problem
Thread Starter
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
1987 Climate Control Problem
This is on bastet44's coupe.
It has electronic climate control, C68.
The compressor won't kick in, and I suspect it's because the freon is low, however, the heater door won't open correctly and I cannot get into the head unit's diagnostics.
According to the manual, pressing the rear defroster and the manual fan up button at the same time should enter the system into diagnostics mode. However, that does not happen.
The head unit appears to be working ok. When the buttons are pressed, things happen... fan changes speed, ducts change, etc, but it just won't go into diagnostics and the compressor won't kick in.
At this time, I am not in a hurry to spend 2 days tearing into the dash to repair/replace any damaged hardware.
I have heard a lot of problems about the CC, but I have never heard about a unit that won't go into diagnostics mode...
Ideas?? Thoughts?? Suggestions? Thanks!!!
It has electronic climate control, C68.
The compressor won't kick in, and I suspect it's because the freon is low, however, the heater door won't open correctly and I cannot get into the head unit's diagnostics.
According to the manual, pressing the rear defroster and the manual fan up button at the same time should enter the system into diagnostics mode. However, that does not happen.
The head unit appears to be working ok. When the buttons are pressed, things happen... fan changes speed, ducts change, etc, but it just won't go into diagnostics and the compressor won't kick in.
At this time, I am not in a hurry to spend 2 days tearing into the dash to repair/replace any damaged hardware.
I have heard a lot of problems about the CC, but I have never heard about a unit that won't go into diagnostics mode...
Ideas?? Thoughts?? Suggestions? Thanks!!!
Instructor
Joined: Jul 2004
Posts: 110
Likes: 0
From: Decatur Al
On the '87, to get the C68 system into diagnostic mode, you need to press the Ext. Temp button and the Auto Fan button at the same time. (a "minor" documentation error which was pointed out to me by Gordon Killebrew when I attended his C4 classes a few weeks ago)
Racer
Joined: Jan 2001
Posts: 386
Likes: 0
From: Ludlow Ma
I had a problem with mine as well and had to do some experimenting
in order to find the right combination to get to the diagnostic codes.
Try "Ext. Temp" button....hold in
then press and release "Auto" button
worked for me.
in order to find the right combination to get to the diagnostic codes.
Try "Ext. Temp" button....hold in
then press and release "Auto" button
worked for me.
Thread Starter
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
ah... typo's will kill the best of us...
I will give that a try!!!!
Thanks!!!
EDIT: That worked... no codes... it makes me think I have a wiring problem.
I will give that a try!!!!
Thanks!!!
EDIT: That worked... no codes... it makes me think I have a wiring problem.
Last edited by bogus; May 10, 2005 at 12:28 AM.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
ground the presure switch with the key on but engine off, and if the compressor cuts in its probably too low on gas, if it doesnt have at least 6psi on the low side it cant drag the oil around the system to lubricate so it wont let the compressor engage.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
No low gas codes until '90 (which for that year and beyond you can pick up on a scanner or through the Speedo or through the Dash Assembly). There is a code for the temp door motor though. Enter diagnostics and see if it shows anything other than "00".
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