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post #1 of 8 Old 07-10-2019, 01:23 PM Thread Starter
99sliverram
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Hvac check valve

Anyone know of a source other than the dealer for these check valves located near the passenger side firewall? My truck is doing the a/c coming out the defrost under hard acceleration. I have checked the local parts places ie, autozone, oreilys. With no luck. My local stealership wants $40 for one and it's a special order.

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post #2 of 8 Old 07-11-2019, 05:18 AM
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post #3 of 8 Old 07-13-2019, 07:44 PM Thread Starter
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Thanks Moparite.

Formerly 2000redram
FORMER Member #93 of "The Red Truck Club"

I no longer have the truck. Time for new name
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2017 Ram 1500 Laramie 2wd quad cab

1999 Dodge Ram 1500 Laramie 4x4 quad cab Driftwood/(sliver) metallic, leather int Member #180 Sliver truck club
3:92 gears
3" lift
285/75/16 all terrains
Randy Ellis light bar with 4 KC daylighters

94 -96 NEW in box Mopar Ram electronic ignition switch for sale $20 shipped to the lower 48.

Future mods
Exhaust
315/75/16 tires
Trucks and guns member #47


69 Charger R/T "General Lee replica"
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440 .030 over
ported heads
10 to 1 comp
flowmaster exh
727 torqueflite w/ 2500 stall
4:10 geared Dana 60 with detroit locker
Not track tested yet. "weekend driver"
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post #4 of 8 Old 07-23-2019, 05:41 PM
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I am having the issues with losing the vacuum when headed up a hill just as original poster. NAPA says this part won't fit my 99 2500. Any other suggestions?

Thanks.

PS. Been a long time since I posted. Used to have a 79 Ramcharger. Sold it. Now back to my old Dodges. I even forgot my log in name.

My kids get the new trucks. Something about airbags being safer for the boys than the old man.
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post #5 of 8 Old 07-26-2019, 07:58 AM
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I actually just bought one last week at my local napa. 5 bucks and a little change😁
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post #6 of 8 Old 07-31-2019, 04:06 PM Thread Starter
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My wife found one amazon for $4. but it didn't fix the problem. I moved on to the check valve near the passenger side of intake manifold. Changed it. Still goes out the defrost under med to hard acceleration.

Formerly 2000redram
FORMER Member #93 of "The Red Truck Club"

I no longer have the truck. Time for new name
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2017 Ram 1500 Laramie 2wd quad cab

1999 Dodge Ram 1500 Laramie 4x4 quad cab Driftwood/(sliver) metallic, leather int Member #180 Sliver truck club
3:92 gears
3" lift
285/75/16 all terrains
Randy Ellis light bar with 4 KC daylighters

94 -96 NEW in box Mopar Ram electronic ignition switch for sale $20 shipped to the lower 48.

Future mods
Exhaust
315/75/16 tires
Trucks and guns member #47


69 Charger R/T "General Lee replica"
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440 .030 over
ported heads
10 to 1 comp
flowmaster exh
727 torqueflite w/ 2500 stall
4:10 geared Dana 60 with detroit locker
Not track tested yet. "weekend driver"
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post #7 of 8 Old 08-19-2019, 02:48 PM
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You have a leak in the vacuum line to the HVAC vacuum servo's under the dash.
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post #8 of 8 Old 08-20-2019, 05:35 AM
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You need to install them in the correct direction! If you have it reversed it's like not even having them. Vac needs to flow towards the engine not the other way. And yes even if they are installed correctly you have some leakage from 20 year old vac actuators.
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