DODGE 1500 3.2L 318 VACUUM PROBLEM

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GENEBLAKE - 01 Apr 2007 18:31 GMT

At about 2000 rpm my truck will change the air flow from pushing air out of
the front dash to pushing air to the defrost! I am sure its a vacuum
problem but am having trouble identifying where the problem is at. The
truck will also act like its vapor locking after about thirty minutes of
driving unless i keep it at about 1500 t0 1700 rpms then it will take as
long as an hour before the problem shows itself, am getting about 9 to 10
mpg also can someone help me?

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Max Dodge - 01 Apr 2007 22:25 GMT

Sounds like a vacuum leak. Start with the intake and move outward from the
engine along hoses, etc.

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> At about 2000 rpm my truck will change the air flow from pushing air out
> of
[quoted text clipped - 4 lines]
> long as an hour before the problem shows itself, am getting about 9 to 10
> mpg also can someone help me?

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Chris Thompson - 01 Apr 2007 23:38 GMT

> At about 2000 rpm my truck will change the air flow from pushing air out of
> the front dash to pushing air to the defrost! I am sure its a vacuum
[quoted text clipped - 3 lines]
> long as an hour before the problem shows itself, am getting about 9 to 10
> mpg also can someone help me?

could be the vacuum check valve gone bad.

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Stormin Mormon - 02 Apr 2007 01:28 GMT

The one guy I knew, he spotted vacuum leaks by take the air
cleaner off. Start the motor, and idle it. Spray ether starting
spray on the vac lines. When he found the leak, the engine sound
would change. I guess you could try this with a non flammable
liquid, if you wanted to be safer. Non flammable brake cleaner,
maybe?

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: At about 2000 rpm my truck will change the air flow from pushing air out of
: the front dash to pushing air to the defrost! I am sure its a vacuum
[quoted text clipped - 3 lines]
: long as an hour before the problem shows itself, am getting about 9 to 10
: mpg also can someone help me?

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TBone - 02 Apr 2007 05:12 GMT

If you were to use a non-flammable fluid then the engine noise would not
change.

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> The one guy I knew, he spotted vacuum leaks by take the air
> cleaner off. Start the motor, and idle it. Spray ether starting
[quoted text clipped - 16 lines]
> about 9 to 10
> : mpg also can someone help me?

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GENEBLAKE - 02 Apr 2007 18:28 GMT

AM HAVING TROUBLE LOCATING THE VACUUM CELINOID!
AND AND FEELING VERY PERPLEXED.

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GENEBLAKE - 03 Apr 2007 01:32 GMT

AM HAVING TROUBLE LOCATING THE VACUUM CELINOID!
AND AND FEELING VERY PERPLEXED.

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