Ac problem with my 1972 chevy truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MANDO · 07-08-2009, 08:50 AM

My ac blows cold air when i have it parked but when you start driving i get hot air coming out the vents when i stop at a light it starts blowing cold air again has anybody had this problem before

JohnC · 07-08-2009, 08:56 AM

Sounds like maybe flapper door isn't closing or something. Hopefully someone will have more info on it.

MANDO · 07-08-2009, 08:58 AM

Do you know where the flapper door is located

JohnC · 07-08-2009, 09:01 AM

Sorry I don't. I'm not familair with the 67-72 trucks. I'm sure someone will chime in and help you out with more info. This site is full of great info.

Also I forgot earlier. Welcome to the boards!

MANDO · 07-08-2009, 09:04 AM

ok thanks

**Ricks1971** · 07-08-2009, 09:05 AM

The flapper door is located under the cowl on the passenger side just under the pass side wiper.

markster5 · 07-08-2009, 09:08 AM

sound.s like a vacuume problem check to see if youre vac canaster is holdind vacuume.and check the hot water valve to see if it is closing all the way. ir vacuume is lost the system will defalr to defroster.

MANDO · 07-08-2009, 09:10 AM

Ok i will check when i get home to see if that is the problem

Thank You

Longhorn Man · 07-08-2009, 03:59 PM

Quote:

Originally Posted by markster5

sound.s like a vacuume problem check to see if youre vac canaster is holdind vacuume.and check the hot water valve to see if it is closing all the way. ir vacuume is lost the system will defalr to defroster.

I agree with the Vac problem... however, these trucks won't defult to the defroster vents. Those doors and flappers are all manual on these.

07-08-2009, 08:50 AM	#1
MANDO Registered User Join Date: Feb 2007 Location: Houston, TX Posts: 8	Ac problem with my 1972 chevy truck My ac blows cold air when i have it parked but when you start driving i get hot air coming out the vents when i stop at a light it starts blowing cold air again has anybody had this problem before

07-08-2009, 08:56 AM	#2
JohnC Registered User Join Date: Feb 2009 Location: Oklahoma Posts: 7,461	Re: Ac problem with my 1972 chevy truck Sounds like maybe flapper door isn't closing or something. Hopefully someone will have more info on it.

07-08-2009, 08:58 AM	#3
MANDO Registered User Join Date: Feb 2007 Location: Houston, TX Posts: 8	Re: Ac problem with my 1972 chevy truck Do you know where the flapper door is located

07-08-2009, 09:01 AM	#4
JohnC Registered User Join Date: Feb 2009 Location: Oklahoma Posts: 7,461	Re: Ac problem with my 1972 chevy truck Sorry I don't. I'm not familair with the 67-72 trucks. I'm sure someone will chime in and help you out with more info. This site is full of great info. Also I forgot earlier. Welcome to the boards!

07-08-2009, 09:04 AM	#5
MANDO Registered User Join Date: Feb 2007 Location: Houston, TX Posts: 8	Re: Ac problem with my 1972 chevy truck ok thanks

07-08-2009, 09:05 AM	#6
Ricks1971 Senior Member Join Date: Mar 2006 Location: Clarkrange Tennessee Posts: 1,787	Re: Ac problem with my 1972 chevy truck The flapper door is located under the cowl on the passenger side just under the pass side wiper.

07-08-2009, 09:08 AM	#7
markster5 Registered User Join Date: Jan 2009 Location: stuart florida Posts: 59	Re: Ac problem with my 1972 chevy truck sound.s like a vacuume problem check to see if youre vac canaster is holdind vacuume.and check the hot water valve to see if it is closing all the way. ir vacuume is lost the system will defalr to defroster.

07-08-2009, 09:10 AM	#8
MANDO Registered User Join Date: Feb 2007 Location: Houston, TX Posts: 8	Re: Ac problem with my 1972 chevy truck Ok i will check when i get home to see if that is the problem Thank You



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