mechanics i have a ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

meathead95 · 07-05-2003, 04:29 PM

I have a 96 olds cutlass supreme and here lately when you are accelerating the air quits blowing and when you let off the gas it starts blowing again. any ideas?
Thanks in advance
Keith

Dean23 · 07-05-2003, 04:48 PM

do u mean the fan in the heater slows down and speeds up. if so the alternator is on ts way out, time for a new one

**john** · 07-05-2003, 05:06 PM

Sounds like your vacuum supply is dropping under acceleration. See if you have a vacuum reservoir for your heater a/c controls. split hose etc.

cableguy0 · 07-05-2003, 05:28 PM

some cars im not sure if that is one of them have like a cut off switch for when ur under wide open throttle it gives u the power by turning off the a/c compressor and as the other said check all you vaccum lines for a leak

Dean23 · 07-05-2003, 05:54 PM

i need to read closer i thought it said shuts off when releasing throttle... i agree with a possible vac leak or maybe a poor connection somewhere and the weight transfer of accel pulls on wires and lossens the connect then on decel and cruise it comes back together

*Piston* · 07-05-2003, 07:56 PM

A common area: there is a vacuum resevior located either next to the brake booster or near the drivers side fender/core support area. It's very easy to pull the hose off of the vacuum canister and will cause the exact thing that your describing.

As mentioned before, check your vacuum supply, canister, one-way check valve operation and if everthing is in order you could have a problem in the control head (vacuum leak) or a vacuum pod.

Tx Firefighter · 07-05-2003, 08:34 PM

Piston's answer is going to be right on the money...

It's probably a vacuum problem. I bet, that it doesn't quit blowing, it just blows out the defroster instead of the vents, when it happens. Classic symptoms of a vacuum leak to the canister, or check valve failure.

meathead95 · 07-06-2003, 08:54 AM

your right it doesnt quit blowing all together it just blows on the floor and the vents quit i will check it out tomorrow thanks fellas

07-05-2003, 04:29 PM	#1
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,440	mechanics i have a ? I have a 96 olds cutlass supreme and here lately when you are accelerating the air quits blowing and when you let off the gas it starts blowing again. any ideas? Thanks in advance Keith __________________ 72 2wd blazer 72 swb 4x4

07-05-2003, 04:48 PM	#2
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	do u mean the fan in the heater slows down and speeds up. if so the alternator is on ts way out, time for a new one __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

07-05-2003, 05:06 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Sounds like your vacuum supply is dropping under acceleration. See if you have a vacuum reservoir for your heater a/c controls. split hose etc. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

07-05-2003, 05:28 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	some cars im not sure if that is one of them have like a cut off switch for when ur under wide open throttle it gives u the power by turning off the a/c compressor and as the other said check all you vaccum lines for a leak __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

07-05-2003, 05:54 PM	#5
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	i need to read closer i thought it said shuts off when releasing throttle... i agree with a possible vac leak or maybe a poor connection somewhere and the weight transfer of accel pulls on wires and lossens the connect then on decel and cruise it comes back together __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

07-05-2003, 07:56 PM	#6
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,300	A common area: there is a vacuum resevior located either next to the brake booster or near the drivers side fender/core support area. It's very easy to pull the hose off of the vacuum canister and will cause the exact thing that your describing. As mentioned before, check your vacuum supply, canister, one-way check valve operation and if everthing is in order you could have a problem in the control head (vacuum leak) or a vacuum pod.

07-05-2003, 08:34 PM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Piston's answer is going to be right on the money... It's probably a vacuum problem. I bet, that it doesn't quit blowing, it just blows out the defroster instead of the vents, when it happens. Classic symptoms of a vacuum leak to the canister, or check valve failure.

07-06-2003, 08:54 AM	#8
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,440	your right it doesnt quit blowing all together it just blows on the floor and the vents quit i will check it out tomorrow thanks fellas __________________ 72 2wd blazer 72 swb 4x4



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