Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Dodge Tech
GL4x4 Live! GL4x4 Casino







Search
Reply
 
Thread Tools
Old August 28th, 2007, 05:02 PM   #1
GreaseMonkey
Senior Member
 
GreaseMonkey's Avatar
 
Join Date: 11-04-05
Location: Washington, MI
Posts: 17,875
iTrader: (22)
HVAC switches to defrost under load.

Here's my other issue on my truck ('01 Dodge Ram 4x4).

Say I have the A/C pointing at my face. If I'm on the freeway and give it 3/4 throttle so the load increases on the engine, the vacuum change causes my HVAC to switch to defrost.

I've checked with tech manuals and it is supposedly a common problem says to replace both check valves on the vac lines near the intake manifold.

I pulled both valves and checked them and they hold vacuum. The lines don't seem to have any leaks either.

Any help?
__________________
Quote:
Originally Posted by kerryann View Post
I am not a lesbian but if I was I would do her.
GreaseMonkey is offline   Reply With Quote
Old August 28th, 2007, 07:11 PM   #2
Buggy_Tim
(513) 891-8372
 
Buggy_Tim's Avatar
 
Join Date: 11-05-05
Location: Sault Sainte Marie
Posts: 11,616
iTrader: (12)
Ask PP he knows everything.
Buggy_Tim is offline   Reply With Quote
Old August 28th, 2007, 09:36 PM   #3
user name
keep your stick onthe ice
 
user name's Avatar
 
Join Date: 02-23-06
Location: around MI and such
Posts: 903
iTrader: (0)
Quote:
Originally Posted by MuddyPaws View Post
Ask PP he knows everything.
:tonka:
user name is offline   Reply With Quote
Old August 28th, 2007, 09:38 PM   #4
user name
keep your stick onthe ice
 
user name's Avatar
 
Join Date: 02-23-06
Location: around MI and such
Posts: 903
iTrader: (0)
is there a vac res to hold vacuum to the hvac under at wot?
user name is offline   Reply With Quote
Old August 28th, 2007, 09:49 PM   #5
Mclovin
"The Situation"
 
Mclovin's Avatar
 
Join Date: 11-07-05
Location: Dearborn Heights, Mi
Posts: 14,390
iTrader: (15)
Send a message via AIM to Mclovin Send a message via Yahoo to Mclovin
your truck just wants to make sure you have a clear view when going that fast
Mclovin is offline   Reply With Quote
Old August 28th, 2007, 10:39 PM   #6
GreaseMonkey
Senior Member
 
GreaseMonkey's Avatar
 
Join Date: 11-04-05
Location: Washington, MI
Posts: 17,875
iTrader: (22)
Quote:
Originally Posted by user name View Post
is there a vac res to hold vacuum to the hvac under at wot?
Not that I can see. I'll have to pull up some diagrams tomorrow in the auto building computer lab and see if there's anything.
__________________
Quote:
Originally Posted by kerryann View Post
I am not a lesbian but if I was I would do her.
GreaseMonkey is offline   Reply With Quote
Old August 29th, 2007, 11:25 PM   #7
Buggy_Tim
(513) 891-8372
 
Buggy_Tim's Avatar
 
Join Date: 11-05-05
Location: Sault Sainte Marie
Posts: 11,616
iTrader: (12)
Usually it means the res is cracked, or disconnected.
Buggy_Tim is offline   Reply With Quote
Old August 29th, 2007, 11:40 PM   #8
GreaseMonkey
Senior Member
 
GreaseMonkey's Avatar
 
Join Date: 11-04-05
Location: Washington, MI
Posts: 17,875
iTrader: (22)
Quote:
Originally Posted by MuddyPaws View Post
Usually it means the res is cracked, or disconnected.
Where's the res located?
__________________
Quote:
Originally Posted by kerryann View Post
I am not a lesbian but if I was I would do her.
GreaseMonkey is offline   Reply With Quote
Old August 30th, 2007, 08:21 AM   #9
Haggar
Covered in mud...
 
Haggar's Avatar
 
Join Date: 11-06-05
Location: Oxford, MI
Posts: 17,399
iTrader: (52)
Hmm, my 96 ram does it also, its really annoying..

Hoping muddypaws will post some purty diagrams....

:dunie:
Haggar is online now   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Dodge Tech
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -5. The time now is 02:39 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
Copyright 2005 - 2012 Cracker Enterprises - Powered by Linux
vB Ad Management by =RedTyger=
Page generated in 0.09240 seconds with 30 queries