I have read threads on this site for awhile now and just joined because I cant find a answer. I searched the threads with no luck. My vacuum check valve went bad which seems like a common problem.I went to the dealer but thay could care less about finding what I need.My question is does anyone know the part number for the new check valve? I have a 98 ram 1500 4x4 5.2. Thanks in advance

 

No idea of a part# but there are products called HELP at most parts stores and in that section there are universal vacuum check valves.

 

From HankL

an old post from year 2000 that might be of interest:
----
I had ordered a replacement part from Dodge that is supposed to correct the
'Wild Vents' problem. This is where AC/Heat air blowing out vents
mysteriously changes and comes out other vents. It is most prone to happen
when accelerating. I read that the cruise control can suddenly 'pop out' of
setting too.

I haven't had the vents change wildly like that myself, but I have had the
'Defrost' setting refuse to work, then come on suddenly 10-15 minutes later.

Chrysler's 'Fix' is replacement part number 04677204.
I think there is a TSB on this.
I had seen the description of the problem in some automotive service
magazines.
My local Dodge dealer told me they now had the part, and I went and picked it
up (plus a broken passenger side sun visor clip). Cost was $7.84


The replacement part turns out to be about the size of a 35 mm Film can and is
a small vacuum reservoir with a built in check valve.
The original part (4306923) was a tiny check valve about the size of the tip
of my thumb. These check valves are in the vacuum line connected to the
nipple just rearward of where the PCV valve hose connects on the passenger
side of the engine. Just behind this check valve the vacuum line T's off that
goes to the cruise control mounted underneath the battery.

But when I went to put it on, I found that the new part lacked the proper
rubber hose fittings to install it. The new valve 4677204 has 3/16 nipples.
The new valve comes with only one rubber reducing elbow which has a female 3/8
end, and the other end 3/16 female.

The original check valve 4306923 has 1/4 plastic nipple ends and has a 1/4
rubber female elbow on one end, and short length of 1/4 rubber hose on the
other. The new valve's 3/8 rubber elbow is wrong - too big to seal to the 1/4
nipple at the intake manifold.

I went back to the Dodge parts counter to ask for the proper rubber fitting to
make it work, but they said they didn't have them and suggested I would have
to go to a parts store. At the local Advance Auto I could not find exactly
the right fittings, but was able to put the new check valve on using slightly
smaller fittings:

Motormite Mfg. Vacu-Tite! pn 47411 rubber elbow with 9/64 and 7/32 id ends,
and Motormite Vacu-Tite pn 47411 rubber straight with 9/64 and 5/32 id ends.

Seems sloppy on Chrysler's part - but maybe later model Rams than a 1995 have
different sized vacuum hoses and manifold fittings ?


Either of the two part numbers I bolded will work.
Also, search for "Wild Vents".

 

haven't heard from Hank in a long time. I don't think he ever came back after the server meltdown of ?? whenever it was.

 

It wasnt but what about three months after I joined here, that he got royally flamed for his posts. I seem to remember he flat said he was done or something like that....
I always enjoyed his posts, they actually had substance to them.

 

I will try that number today and see what happens. Thanks

 

your local parts store might not have a clue as to what those numbers mean, but a dealership will.
its not that expensive like $7.xx.

 

If you cant get the actual replacements through Dodge, +1 on just getting regular vacuum check valves from any autoparts store. the HELP brand of products makes some for less than $5, and they work just as good. I replaced the one on my 97 5.9 on the intake manifold side, cured the vent problem. As I recall they didnt fit 100% exact to the vacuum hose size, but a little electricians tape wrapped around the nipple fixed that. Been working 100% for over 2 years, cant complain.

 

96 Ram 5.9 found the HVAC vacuum hose location. guessing the middle of the 3, going through the firewall with the A/C Hard lines.
I bought the new check valve(04677204) from dodge today, need the correct nipples.
Anyone have a photo of this?

 

Quicker fix,
1. Cut plastic hard line, and buy Vacu-tite Soft vacuum connector#47405/Dorman 494-105 (5/32"x1/8") and connect to end with ridge toward the engine.

2. Use a Vacu-tite Soft vacuum connector#47406/ Dorman 494-102 (1/8"x11/64") to connect valve to cut hard line.

Done.