a/c loss on acceleration
- Thread starter flyboy618
- Start date
fastfang
Enthusiast
It is normal. The compressor cuts off during full throttle for maximum horsepower.
ViperGTS
Enthusiast
- Joined
- Jul 15, 2001
- Posts
- 5,016
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Again - is the SEARCH button not working?
Warfang
Enthusiast
There really should be an FAQ on the different gens. The same 5-10 questions pop up every 6 months or so.
Knight Viper
Viper Owner
Don't blame the new guy, our search feature is not very user friendly. I hope someone will chime in with a part #, there is a inexpensive one way valve that can be added to the vacuum line coming off the rear of the right valve cover to keep the door from closing on hard acceleration.
mad0953
Enthusiast
I think flyboy is pulling our legs.....A/C in January in Colorado????
kcobean
Enthusiast
If you're defrosting, definitely...it's all about the condenser.
mad0953
Enthusiast
OIC.....never have used the air or the defrost....my bad. 
Dave's Big Brakes
Enthusiast
Huumm, Like Jon B always say's advertising money wasted
Check my web site under engine & trans for my vacumm canister kit
www.davesbigbrakes.com
Fast Freddy
Enthusiast
its a good thing that the AC compressor shuts off at high rpm otherwise you will blow up your AC compressor. i blew a AC compressor on a camaro and a chevy truck both as a result of them not having this feature that the viper has. the AC compressor on my 2004 Z06 does not shut off at high rpm's like my viper. i would definately not hard wire my vipers AC compressor up like GM does. with that said daves kit would be the way to go for sure if you want to do this. just remember to turn your AC off when you are racing. something that is easy to forget for me living out in arizona where its always so hot here.
Dave's Big Brakes
Enthusiast
Hey Fred,
It still will shuoff @ WOT the computer does that, BUT anything below WOT the ac should still work. I had the problem just barley touching the trottle the A/C would blow hot air, this kit still allows the computer to control the A/C.
Dave
Fast Freddy
Enthusiast
Hey Fred,
It still will shuoff @ WOT the computer does that, BUT anything below WOT the ac should still work. I had the problem just barley touching the trottle the A/C would blow hot air, this kit still allows the computer to control the A/C.
Dave
way to go dave
daves always one step ahead of all of us with the R&D. this is why i bought my brakes from him and will be buying this AC contoller from him too.
AJT
Enthusiast
Read this thread.
It is a $ 5.00 fix. It IS Vacum related.
http://www4.forum.viperclub.org/showflat...5c92icsmr8avkg5
It took 3 minutes to do.
Andy
It is a $ 5.00 fix. It IS Vacum related.
http://www4.forum.viperclub.org/showflat...5c92icsmr8avkg5
It took 3 minutes to do.
Andy
RevHeat
Viper Owner
Yes, I totally agree! I am going to work on writing up a FAQ for Gen I and Gen II owners. The FAQ would be geared toward new owners; however, it will contain information that could be used as a reference for common viper issues.
If anyone wants to contribute any ideas, please email them to me at [email protected].
Rev
Dave's Big Brakes
Enthusiast
Here's the installed Vac Canister A/C Kit from Dave's Big Brakes
Very easy to install and works great 
and looks like the factory installed it
Check all my other great parts @
www.davesbigbrakes.com
Very easy to install
and works great and looks like the factory installed it Check all my other great parts @
www.davesbigbrakes.com
The A/C should NOT shut off under any acceleration, not WOT, not ever. The computer does *not* shut it off, and max rpm will not blow the system.
The cause of the hot air is loss of vacuum to the valve that moves the air flaps in the hvac system - the fix is a vacuum check valve.
The cause of the hot air is loss of vacuum to the valve that moves the air flaps in the hvac system - the fix is a vacuum check valve.
This is good news, but the ac cuts out so easily on the hiway so I thought it was a vacuum door problem.???????Here's the installed Vac Canister A/C Kit from Dave's Big Brakes
Very easy to install
Check all my other great parts @
www.davesbigbrakes.com
I think flyboy is pulling our legs.....A/C in January in Colorado???? [
/quote]
No, we are not driving our Vipers with two feet of snow on the ground. That is why I'm on my computer talking to you FINE folk! By the way, does anyone have snow tires to fit the Viper???? Maybe some snow chains???? We are going through withdrawls here......
mad0953
Enthusiast
I drove mine on Monday and it was 29 degrees out but no snow on the road. I know what you mean about "going through withdrawls". I had both windows down and the heat on full blast. I love the sound of a V10.
AJT
Enthusiast
Parts from Mcmaster.com
High Temp Valve #47245K26, $4.80
High Temp Hose, #51135K172, $.81/ft (need 1.25")
99 R/T 10
Enthusiast
What is the Vac canister supposed to do? Does the $5 "canister" AJT posted do the same thing?
luc
Enthusiast
What is the Vac canister supposed to do? Does the $5 "canister" AJT posted do the same thing?
The 1 way valve ( the $5 canister) will indeed solve the lack of vaccum issue at WOT and consequently the vaccum operated door will not close and you will have air coming from the vents at WOT
The vaccum reservoir has a check/1 way valve in it so it will also accomplish the same function but it,as it's name imply, also will provide a reserve of vaccum, including when the engine is off.
In another word, with the engine off, you can move the dial ( floor,defrost,etc)
and all the vaccum motors will still operate for a few times (you will hear the flaps opening/closing.
It's a nice way to check the system for leaks, if after not driving the car for a few days/weeks, you move the dial before starting the engine and you can hear the flaps moving, you know that the system is not leaking.
Luc 00 GTS
The 1 way valve ( the $5 canister) will indeed solve the lack of vaccum issue at WOT and consequently the vaccum operated door will not close and you will have air coming from the vents at WOT
The vaccum reservoir has a check/1 way valve in it so it will also accomplish the same function but it,as it's name imply, also will provide a reserve of vaccum, including when the engine is off.
In another word, with the engine off, you can move the dial ( floor,defrost,etc)
and all the vaccum motors will still operate for a few times (you will hear the flaps opening/closing.
It's a nice way to check the system for leaks, if after not driving the car for a few days/weeks, you move the dial before starting the engine and you can hear the flaps moving, you know that the system is not leaking.
Luc 00 GTS
On the other hand, its sad that so many have looked at the question, yet so many of old-timers got the answer wrong. Evidently not many are reading or remembering the correct answer.It is funny that this question has been asked before yet 300+ have still looked at this question.................
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