I am not 100% sure, but i think the Service Manual d/l. (merry christmas thread) includes the routing and diagrams for the vac lines? Also check the control unit itself for vac leaks.

 

you say you installed the vac canister, when you put a check valve or the canister on the right side of the T, all it does is bypass the original check valve on the side of the manifold and rule out a leak in the line going to the cruise. that should fix it but it doesn't work for everyone, like you and me.

i'm replacing an axle seal on my truck and its been down for a week or so because i'm lazy and haven't gotten around to finishing it. while i was under my truck i noticed that i have a vacuum line cluster (4 rubber lines in a harness) that was just sitting on top of the heat shield above the cat (thanks ****ty transmission tech). anyway, i found out that it plugs into the top of the transfer case so i plugged it back in and i am hoping that it is the reason that the wild vent fix didn't work for me. like i said though, i'm lazy and still need to put my front axle back together before i can find out if that was where my vacuum leak was at.

so check out the lines that go to the top of your transfer case.
also, on the driver side floor, to the right of the gas pedal there is a vac cluster with a few lines and there are two vac canister things under there, one with a red and one with a yellow vac line on them. i think the canister things open and close the blend doors. you can see them without removing any of the dash.

 

Thanks for the pass. I was not expecting to get a result in an hour or a day. I was just irritated spending hours searching online and digging into my boat truck troubleshooting in the hot florida sun to get told to go and search. I was pissed for good reason but completely out of line. I have apologized to dodgeram2001 and am in a better mood and will play nice from now on. If not, I expect a full hazing or ban from the forum. Thank you all for putting up with my rant!

 

zman, I checked vacuum by disconnecting the yellow line from the door vacuum switch with the engine running yesterday. I get about 15" of vacuum. When I kill the engine but keep the rest of the test the same, I cannot get this same connection to hold vacuum. I wanted to know if this was normal and if not, that means I have a leak somewhere from that yellow line (which runs from the switch) the switch, to behind the dash, to behind the heater core, to the firewall.
i do understand what you are trying to say, and/but I think I did it right. Then when I got done testing that, I hooked my vacuum pump where the yellow connector went on the door vacuum stswitch, I could get it to hold vacuum and the actuator would pull the door down to regular ac vents and hold it there. That is why I do not think I have a problem at the actuator.

I really think it is going to be at the switch or the lines from the switch to the area behind the glove box. I really want to know how to test the switch to eliminate that dang thing! :-)

 

Cool, I will check this. I am not too optimistic though since I held vacuum on ALL individual lines under the hood except for the firewall line that runs to the AC controls. Maybe I tested wrong though so I am going to try this and see! Thanks.

 

If you can't figure out what is going on behind the firewall or inside the dash box, why don't you spend a little time at this link (below) and read through the TSBs for your year truck. You may get some useful information. The 98+ Rams are notorious for vacuum problems, and there is a TSB for it.

http://dodgeram.info/tsb/index.html

 

i got it!, vents switch around from ac to heat to defrost, ya just never know what is going to come out. I was wondering if you discovered what caused your problem.

Thanks

 

Check this thread out https://dodgeforum.com/forum/2nd-gen...ild-vents.html

 

My 98 5.2L ram has a very weird problem with the vents...it's not the wild vent problem that everyone has...mine is this:

My ac blows extremely strong out the driver's side vent. The middle two vents hard have air blowing out of them..the vents on the passenger side are alittle more air flow than the middle but nothing compared to the drivers side vent! It is totally crazy...can anyone tell me what is going on..????

 

unbelieveable! first vacuum hose i looked at had the break in it. turns out the grey one that ends up going thru the firewall and in behind the glove box was the culprit.

Thanks to all that participated.