a/c 1999 Dodge vanB1500 318 - AC Auto Repair Help Forum


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a/c 1999 Dodge vanB1500 318

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laloana@aol.com
New User

Jul 4, 2012, 8:21 AM

Post #1 of 3 (1730 views)

a/c 1999 Dodge vanB1500 318	Sign In

Hello My name is Nick. Have 1999 Dodge B1500 conversion van w/318. a/c question. Originally air only worked on the defrost. Replaced a couple of the vacuum hoses. Now when it operates if you accellerate on hill it will switch to defrost again and you have to turn the control for vent operation to vent and floor control to get it to switch back to the front vent.When switch for rear is switched on the air goes from cold to hot. Is there a vacuum control that needs replaced or any suggestions?

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jul 4, 2012, 9:22 AM

Post #2 of 3 (1706 views)

Re: a/c 1999 Dodge vanB1500 318	Sign In

Re check for vacuum repairs and look for more and that a storage tank has a check valve that operates.

Other: You really should change that user name as this is open web for anyone to send or collect that for spam! Just go to to top and "Edit Profile".....

T

Discretesignals
Ultimate Carjunky / Moderator
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Jul 4, 2012, 9:27 AM

Post #3 of 3 (1703 views)

Re: a/c 1999 Dodge vanB1500 318	Sign In

It still may have a leak somewhere. I found the most easiest way to check for leaks in those is by using an EVAP smoke machine. If you can find a shop that has one, it will make finding the leak easier. Another item to watch out for is a vacuum check valve. There is usually vacuum check valve to keep vacuum in the system when you accelerate the engine. Sometimes the check valves can go bad and allow vacuum to leak back out into the intake manifold when it has high pressure inside it during acceleration.

You can also use a vacuum hand pump to find leaks, to test vacuum check valves, and to check the operation and vacuum holding ability of vacuum motors/actuators too, but you have to access different parts of the system to isolate where the leak is hiding.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jul 4, 2012, 9:31 AM)

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