99 Tahoe ac Problem
- Thread starter gmurphy
- Start date
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SunlitComet
OBS Jedi-Do Good
blower speed is dependent on the switch. the evaporator might be clogged restricting flow. Are you saying all four speed are not available. If you have power to the compressor clutch when the a/c is turned on but does not engage the compressor then you have a faulty clutch or bad ground.
SunlitComet
OBS Jedi-Do Good
when the temp mode id on the full left detent it goes into an automatic recirc mode which would give the effect of faster flow because it is not fighting resistance to push it out of a closed up vehicle. Of course you can manually select recirc at any temp. If you have system voltage at the clutch and it does not engage then the clutch unit must be replaced. it can be replaced separately from the compressor but you will likely need the special tool to do it. most parts stores should have it or loan it out.
blackngoldyukon
TYF Newbie
- Joined
- Mar 16, 2014
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You sir are low on freon. Compressor will not engage if refrigerant charge is low.
SunlitComet
OBS Jedi-Do Good
he did say he has voltage at the clutch.
I recently had a similar problem with my '99 Tahoe. I took it to the Chevy dealer and they wanted to replace the compressor and some other parts for $1,200 - $1,400. I took it to a mechanic that was recommended to me (in a small shop with 2 mechanics). The compressor ran intermittently and he said he could only check it if it was not running. I returned when the compressor was not running and he checked the pressure and a few electrical components and found all of that in order. He then struck the outer clutch plate with a piece of wood and the clutch engaged and the compressor started running. He concluded that the gap between the clutch plates was too great due to wear and adjusted it with a special clutch tool to reduce the gap. It has worked fine since then. He did say that the compressor is obviously old and could fail at any time. I understand that but as long as it works, I'm happy.
