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Thread: AC Question

  1. #1
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    AC Question

    Driving along with the AC on and I downshift to pass a truck. AC air starts blowing hot for a few seconds. Let off the throttle and all is well again. Happened twice in two days. Never before. Anyone have an idea why?
    If you want things to stay the same, things will have to change.

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    Common, built in...A/C shuts down on heavy acceleration.
    I don't send or receive "PM's" since I prefer DIRECT communication.

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    My Gen3 does this on anything other than very modest acceleration. I remember Chrysler cop cars back in the '70s having the AC cutoff switch, on the dash, within easy reach.
    Last edited by Old School; 09-09-2019 at 02:24 PM.

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    Thanks Steve. Good to know.
    If you want things to stay the same, things will have to change.

  5. #5
    You can put a check valve in the vacuum supply line. Local parts store should have one for less than $10.

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    Look under Radiators on the Viper Store website.
    Ipsco used to list a device that stops the AC from shutting off under hard acceleration.
    I can't see it on Marks current web page but the Viper store shows a pic of it.
    Perhaps now a discontinued part?

    Or Dave bought them all up

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    Wait wut?
    Red. Because I didn't have to settle for blue.

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    Hey Bill, if this is the first time you have noticed this , then clearly you are not driving the car hard enough

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    Point taken. Will attempt remedy ASAP. :
    If you want things to stay the same, things will have to change.

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    valve.jpg
    Mcmaster.com
    High Temp Valve #47245K26
    High Temp Hose, #51135K172, $.81/ft (need 1.25")
    Last edited by daveg; 09-10-2019 at 06:15 PM.
    96 GTS (# 33, Bone Stock), 66 Mustang Convertible, 66 Mustang Hardtop, 69 Corvette Roadster

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    Thanks daveg
    If you want things to stay the same, things will have to change.

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    Quote Originally Posted by daveg View Post
    ...
    At $15 versus $200 i.e. 87% cheaper, someone can't be too happy that you've discovered this alternate magic.
    Red. Because I didn't have to settle for blue.

  13. #13
    Quote Originally Posted by dave6666 View Post
    At $15 versus $200 i.e. 87% cheaper, someone can't be too happy that you've discovered this alternate magic.
    It's ridiculous how expensive viper ownership can be... I understand they are a pretty small niche market, but damn.

  14. #14
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    Quote Originally Posted by daveg View Post
    valve.jpg
    Mcmaster.com
    High Temp Valve #47245K26
    High Temp Hose, #51135K172, $.81/ft (need 1.25")
    McMaster only has the hose in 10' lengths. NAPA and Advance Auto don't have anything close. Anyone have a small piece they could sell? It's advertised as High-Temperature Silicone Rubber Tubing, Opaque Black, Durometer 70A, 3/16" ID, 5/16" OD
    If you want things to stay the same, things will have to change.

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    Or.... just leave it alone and know the air on these cars will drop out on hard acceleration. Normal.

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    C'mon guys...the A/C doesn't shut off under acceleration...the vacuum drop merely directs the air to the defrost vents. Which is why those check valves can fix the issue.

    Even if the A/C were to shut off under WOT...it won't immediately get hot. Just as the heater core doesn't get cold as soon as you shut the car off.

  17. #17
    Quote Originally Posted by Bill W View Post
    McMaster only has the hose in 10' lengths. NAPA and Advance Auto don't have anything close. Anyone have a small piece they could sell? It's advertised as High-Temperature Silicone Rubber Tubing, Opaque Black, Durometer 70A, 3/16" ID, 5/16" OD
    They don't have 3/16ID Vacuum tube? That's surprising as it's not that uncommon of a size.

  18. #18
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    Installed the check valve last week as shown. Took the Viper for a run, and at WOT with AC on, cold air continued to flow from the dash vents uninterrupted, whereas hot air gushed from the same vents previously. I didn't check the defrost vents to see if additional air was directed to them. Simple fix that works for me.

    IMG_0446.jpg
    Last edited by Bill W; 2 Weeks Ago at 10:29 AM.
    If you want things to stay the same, things will have to change.

  19. #19
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    Quote Originally Posted by Bill W View Post
    Installed the check valve last week as shown. Took the Viper for a run, and at WOT with AC on, cold air continued to flow from the dash vents uninterrupted, whereas hot air gushed from the same vents previously. I didn't check the defrost vents to see if additional air was directed to them. Simple fix that works for me.

    IMG_0446.jpg
    Glad you found the hose and it worked out for you!
    96 GTS (# 33, Bone Stock), 66 Mustang Convertible, 66 Mustang Hardtop, 69 Corvette Roadster


 

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