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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 12-02-2010, 08:29 PM
B and B LANDSCAPES B and B LANDSCAPES is offline
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Thumbs down Vents change to defrost under load

My vents work fine except it changes automatically to defrost when i put the engine under a load ( like full throttle or change gears too quick and have rpms real low) then when the engine gets out of its struggle they change back to where ever i have it set.... My last dodge truck started doing this right before i sold it so i never looked into it... both trucks didnt do it at first but started... anyone care to elaborate what normally would cause this?
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Old 12-03-2010, 09:00 AM
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A bad vacuum check valve can cause this. It's located in the vacuum line that runs into the cab.
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Old 11-04-2011, 08:34 PM
xnumnutsx xnumnutsx is offline
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Quote:
Originally Posted by RamTech View Post
A bad vacuum check valve can cause this. It's located in the vacuum line that runs into the cab.
do you know exactly were i can find this valve? cause i have this same problem on my truck and it is so annoying!
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Old 11-24-2011, 04:26 PM
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If memory serves me correctly...Pass side of the intake there's a line that comes out under right where the throttle cable is. Follow that line and look for the off-white and black inline valve. If not...follow the vacuum line that comes out the passenger's side firewall and look for the same valve in the vacuum line.
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Old 11-24-2011, 06:12 PM
xnumnutsx xnumnutsx is offline
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Quote:
Originally Posted by Warlock III View Post
If memory serves me correctly...Pass side of the intake there's a line that comes out under right where the throttle cable is. Follow that line and look for the off-white and black inline valve. If not...follow the vacuum line that comes out the passenger's side firewall and look for the same valve in the vacuum line.

good shit! ill do that tmrw!!
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Old 11-25-2011, 09:22 AM
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...and pick up a bar of soap while you're at it young man... sutch a potty mouth...

and don't forget to give our member's a rep if they help you out...

...I'm feelin' pretty unf'n appreciated right about now Carl...
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Last edited by Warlock III; 11-25-2011 at 09:28 AM.
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Old 11-25-2011, 12:44 PM
xnumnutsx xnumnutsx is offline
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Quote:
Originally Posted by Warlock III View Post
...and pick up a bar of soap while you're at it young man... sutch a potty mouth...

and don't forget to give our member's a rep if they help you out...

...I'm feelin' pretty unf'n appreciated right about now Carl...
how the hell do i do that?
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Old 11-25-2011, 01:19 PM
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Take a look at the Newbie How To's on giving and receiving Reputation.

And I agree...let's cut back on the 4 letter words a bit...
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Old 05-05-2012, 10:43 PM
KdkGrizz KdkGrizz is offline
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Default Stumbled across this post thankfully

Quote:
Originally Posted by Warlock III View Post
If memory serves me correctly...Pass side of the intake there's a line that comes out under right where the throttle cable is. Follow that line and look for the off-white and black inline valve. If not...follow the vacuum line that comes out the passenger's side firewall and look for the same valve in the vacuum line.
Warlock, Thanks for the good info. I was noticing this issue with the vents this past weekend while pulling my camper. I was trying to sort it out in my mind if it was a trans issue, or a vacuum issue. Glad to know I was on the right track...

I will search out the check valve, and replace it. I think while I am at it I might just replace the throttle position sensor. Been having some erratic shifting in the top end gears.

Be good and thanks for the info...

Grizz....
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Old 05-07-2012, 03:25 PM
KdkGrizz KdkGrizz is offline
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Default Not the check valve.

Well guys. Pulled and replaced the check valvue in question. No change. Now I fear that I am going to have every vacuum ling under the hood and in the passenbger compatment looking for a leak......z

Any other suggestions......
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