A/C always on?.. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-10-2008, 01:59 PM   #1
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Default A/C always on?..

I discovered last night that the AC clutch it ALWAYS engaged on my 92, no matter what the settings on my ECC are (including OFF)
does anyone have an Idea what might be the cause of this, and how I might go about fixing it (other then wiring up a over ride switch)
the only thing I can think of is the ECC I have in the car it a second Gen, and I DONT want to take that out to "fix" the problem, because I Really like being able to control where the air blows out.
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Old 05-10-2008, 02:26 PM   #2
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Stuck relay possibly...
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Old 05-11-2008, 01:42 AM   #3
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Quote:
Originally Posted by sandrock
Stuck relay possibly...
where can I look??

I do paint on cars, and some mechanical work... when it gets into factory electrical I'm kinda lost and need direction
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Old 05-11-2008, 01:48 AM   #4
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Pull the ac relay, if the clutch disengages then you need to see if the relay is being turned on. if its not the replace check wiring then replace relay with a new one.

if the clutch doesn't disengage when you pull the replay, your clutch might be 'stuck on'.
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Old 05-11-2008, 02:18 AM   #5
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Quote:
Originally Posted by popatim
Pull the ac relay, if the clutch disengages then you need to see if the relay is being turned on. if its not the replace check wiring then replace relay with a new one.
if the clutch doesn't disengage when you pull the replay, your clutch might be 'stuck on'.
I did unplug te AC and it did disengage, so I know the Clutch isnt stuck on.

Can you reword the first part you said, I no comprenda
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Old 05-11-2008, 01:11 PM   #6
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Other relays in the Relay C enter are the same part number. Take one of them and put it in place of the AC relay. See if it works, then you'll know if it'* the relay. Quick check for defective, burned, or stuck on, relay.
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Old 05-11-2008, 09:02 PM   #7
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Relays 101.
Relays use a small current to control the switching of a larger current via an electromagent pulling closed a set of contacts, much like the flipping of a switch.

Almost all relays are labelled the same though there are different types :normally open, normally closed... Automotive are almost always normally open

thepins on the botton ate labelled 85, 86, 87, & 30.

85 & 86 are the control current. Typically 12v is hot on pin 86 and the computer (usually) will supply ground to pin 85 to energize it.

pin 30 is power 12v in (high current) and once energized pin 87 is the high current 12v out.

The easiest way to test the relay itself is to swap in another as mentioned.
If the problem is still there then you need to check the contol line going to pin 85. It should not be grounded if the Ecc is not calling for AC. Check for a short to ground on this wire with the relay out.
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Old 05-11-2008, 09:04 PM   #8
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what year is your ecc from? Perhaps theres a wire that needs to be reloacted on it.
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