1996 ram van 3500 Vacuum Question
I know that this has been hashed over many times but I am puzzled by a few different things I cant remember reading, I know I probably did but memory is just about as good as the vans Vacuum system.
We have a 5.9 automatic 3500 van, when you idol the ac on normal it is dash forward only: when you put it on bi air it is forward and defrost vents? Now when you are on normal and put a load on it the air goes from the dash to defrost only. I understand the going up to defrost when the air is on and put under a load but I don't understand why the air is bi level and going to dash and defrost, is this also a sign of a vacuum leak or is this a sign someone has routed the vacuum lines wrong in the past this is a new to us vehicle???? I thank you for any info or direction Grumpy |
Defrost is the default position when there is a loss of vacuum to the air flow door actuators under the dash. The condition you described is the result of a cracked but still attached vacuum line or the HVAC vacuum check valve is leaking.
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or bad/disconnected vacuum reservoir ball also. had similar defrost/vent issues, that was my problem.
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Originally Posted by daguvena88
(Post 3197284)
or bad/disconnected vacuum reservoir ball also.
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the check valve you refer to is the small plastic in line valves???? or is there others I am unaware of???? I have 2 of the small plastic ones, one on the manifold and one near the heater ac controls both are good.
Thanks Grumpy |
On mine it is located in the vacuum line that comes off the passenger side of the intake manifold.
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Now a real problem with the vacuum
Thanks for all the help, I found about 12 leaks in the sets of tubing in behind the ac heater controls with the cigar smoke. Then we found a new and serious problem ; The blend door vacuum actuator I think is the correct name. It is the vac can behind the passenger headlight that has about a 8 inch rod going rearward to a door or ? and looks like to pie pans apx 3 inch diameter banded together. Has a vac line on each side.
This vac actuator thing has a large , half the size of a dime hole rotted in the bottom on one side. Now this is definitely the problem that remains BUT the problem I have is DODGE does not make the part any longer: No dodge dealers we can find has any left in stock. Does anyone have any suggestions on the replacement of this part: We are in Phoenix and needless to say the ac system is a MAJOR requirement :) Any help greatly appreciated; And thanks again for the help on all the other vac leaks ; Cigar smoke really works good especially when you cant hear : Grumpy |
Originally Posted by grumpyone
(Post 3197693)
It is the vac can behind the passenger headlight
Is this it? http://www.moparpartsoverstock.com/p.../04723550.html or you can hit up a junk yard in the area or online or ebay or you could make your own from a fancy travel coffee mug. |
Originally Posted by grumpyone
(Post 3197693)
It is the vac can behind the passenger headlight that has about a 8 inch rod going rearward to a door or ?
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Thanks and more ?s
Ok got that actuator replaced; Had to go to the salvage yard and find one to get one ours had big hole in the can. NOT available in the world today by any new method I could find.
NOW I have all the airflow in the proper order with the Max air flow and all but I still have a problem. The air on BI LEVEL pushed in goes to the front of the dash as should and instead of lower ducts it goes also out the Defrost So I have defrost and front of the dash instead of front of dash and lower on bi level; Now does anyone have any idea which of the two actuators on the top under the dash controls this issue????? I m really hoping to find a hose problem but history of this beast tells me its an actuator up there????? Thanks very much for all the great help we have gotten here Grumpy |
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