A/C and 4x4 problems...related?
Thread Starter
|
Junior User
Joined: Feb 2012
Posts: 89
Likes: 0
A/C and 4x4 problems...related?
I have a vacuum leak. That's clear. When I put the truck in 4WD the air vents to the defrost after a slow (15-20 s) transition. The only way I can get the air to come back to the dash vents is to disengage 4x4. Of course, the auto-lockers aren't working. I can trouble shoot the vacuum lines and find the leak. No big deal.
I've isolated it downstream of the vacuum reservoir. It could be the PVH solenoid but at least the reservoir side holds pressure.
My concern is the noticeably poor A/C performance. It cycles between kinda cool and kinda warm. I remember the A/C being ice cold a few weeks ago.
Could the vacuum leak in 4x4 vacuum lines be related to the A/C problems? I'm thinking blend door vacuum issues. But I can't even find the blend door vacuum lines.
How do I know if my blend door is fully open/closed?
Are there any other place to look that can cut down on my troubleshooting?
Thanks in advance,
-B
I've isolated it downstream of the vacuum reservoir. It could be the PVH solenoid but at least the reservoir side holds pressure.
My concern is the noticeably poor A/C performance. It cycles between kinda cool and kinda warm. I remember the A/C being ice cold a few weeks ago.
Could the vacuum leak in 4x4 vacuum lines be related to the A/C problems? I'm thinking blend door vacuum issues. But I can't even find the blend door vacuum lines.
How do I know if my blend door is fully open/closed?
Are there any other place to look that can cut down on my troubleshooting?
Thanks in advance,
-B
Fleet Mechanic
Joined: Sep 2002
Posts: 1,388
Likes: 2
From: Greensboro, NC
Once you have the vacuum leak to the hubs resolved you should see a noticeable difference. The leak may also be impacting the valve which closes flow to the heater core when the A/C is on. Trace the heater core hoses on the passenger side and you'll see the valve - check to make sure it is opening and closing depending on the mode the A/C is on.
New User
Joined: Oct 2007
Posts: 5
Likes: 0
From: Lincoln IL
Once you have the vacuum leak to the hubs resolved you should see a noticeable difference. The leak may also be impacting the valve which closes flow to the heater core when the A/C is on. Trace the heater core hoses on the passenger side and you'll see the valve - check to make sure it is opening and closing depending on the mode the A/C is on.
Thread Starter
|
Junior User
Joined: Feb 2012
Posts: 89
Likes: 0
I too am looking for the valve and blend door. My PVH solenoid is clearly bad. I tested it and it leaks. I'm hoping that may fix this.
But I suspect my compressor is short cycling too.
Please advise if you have ideas. Thanks!
But I suspect my compressor is short cycling too.
Please advise if you have ideas. Thanks!
Thread
Thread Starter
Forum
Replies
Last Post
