vents
#1
#3
Defrost is the default position if your A/C system loses vacuum for the mode doors. I wanna say there is a check valve that holds the vacuum in the system, that may be damaged. Others will chime in for the location of it.
Aaron you are correct that the A/C compressor will kick off at WOT but that is not his issue.
Aaron you are correct that the A/C compressor will kick off at WOT but that is not his issue.
#5
Originally Posted by 04lvl2
Defrost is the default position if your A/C system loses vacuum for the mode doors. I wanna say there is a check valve that holds the vacuum in the system, that may be damaged. Others will chime in for the location of it.
It could also be a minor leak in the vac system to the HVAC controls. This could allow the controls to work normally during high engine vacuum conditions but revert to defrost when the vacuum is lower.
The OP doesn't say if he has 4WD or not. During 1998 ~ 2000 1/2, the vacuum reservoir on 4x4's was used by both the HVAC controls and by the Pulse Vacuum Hublock system. The PVH system is notorious for leaks and sometimes causes the AC discharge problem at WOT.
Last edited by V8 Level II; 06-17-2006 at 08:15 AM.
#7
#9
#10
Originally Posted by kevman41635
sorry about not saying it was a 2000 2wd 3.0
#13
I was looking into the exact same problem today. I have been noticing my a/c would stop then come back on. I don't knwo if it is when I floor the truck or not. But when it went off I turned the air to max and noticed it was comming out of the defrost.... My truck is a 2000 2.5 2wd. Weird. I'll look into what was said tomorrow and see if i can find the problem.
#15
yeah about a year ago when I had to replace my slave cylinder, i took the fender wells off to get to some of the tranny bolts.. and had to take off that vacuum reservoir and when it came time to test drive the truck (didnt put the wheel wells back in) and forgot about that reservoir just hanging there, the tire burnt one of them clear in half and every thing came out of the defrost vents.. I tried to patch it up with some aquarium tubing and silicone sealant (i know it isnt good for the engine..) and still everything came out the defrost vents.. So i ended up just replacing that vacuum line with some from Napa (at the DEALERSHIP, you have to buy that whole reservoir and other vacuum lines if you want just one piece of vacuum line).. so moral of the story, like said above, if there is ANY kind of leak it'll just go to the defrost vents..
#16
#17
I just looked at a few areas mentioned, and under the air intake, there is a ball, almost like the float in a toilet. It isn't screwed to anything, just hanging there. I take full responsibility for that b/c it was on the wheel well, and i took those off when I put the lift on. So maybe that is cracked, and also a line about the ball looks to be cracked. I really don't know what I’m doing. I know about a/c from my summer job, but it’s hard for me to follow anything in the hood, and I mainly pipe them in at work... As I search around more inside I'll keep yall posted on what was wrong.
Thanks to everyone for showing me where to look.
Thanks to everyone for showing me where to look.
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wdstone
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06-29-2005 05:51 PM