During PV in Asheville my car's defroster failed when a piece of paper was placed over the defroster duct with the defroster cotrols in the closed position and the fan on high. I was shown two non air cars that did have zero leakage when in the closed position and the fan on high. My car has indentation but no hole in the duct at the end just above the upside down "Y". Looking at pictures of the A/C duct layout in the 66 service manual and at a 63 non air car I find a hole in the left side of the duct just above the upside down "Y". The 66 AIM does not show a hole here. Does anyone have a 66 A/C car that they could check and see if such a hole exist. Also if you could close the defroster and place fan on high and lay a piece of paper on the vent discharge and see if air comes past the flapper. I have checked the rubber seal and physically verified the damper is closed in the closed position but about 5% of the air still comes out the defroster on high. No problem on low and medium fan speeds. I am baffled why mine won't seal unless there is a difference in fans or ducts with an air car versus a non air car. I have had three 67 A/C cars checked and all had leakage on medium and high fan speeds. As luck would have it the 67 judge doesn't check for leak by, Any feedback would be appreciated
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Re: 1966 A/C DEFROSTER
My '63 with air blows a piece of paper off the defroster vent with the blower on high, and I think that's the way it's supposed to work. The defroster valve is not designed to seal tightly, and when the blower is on high it lets some of the air pass over the windshield to keep it clear. -
Re: 1966 A/C DEFROSTER
My '63 with air blows a piece of paper off the defroster vent with the blower on high, and I think that's the way it's supposed to work. The defroster valve is not designed to seal tightly, and when the blower is on high it lets some of the air pass over the windshield to keep it clear.Comment
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Re: 1966 A/C DEFROSTER
Who Judged the car?Comment
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Re: 1966 A/C DEFROSTER
Who Judged the car?Comment
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Re: 1966 A/C DEFROSTER
I have a '66 with A/C, which is in storage and I have not seen it in five months. I will try to go and check it for you. The only theory that I have right now is that the fan is really blowing strong on high or the cable that controls the flapper is not doing its job. Could it be binding a little as it closes and not letting the flapper close all the way?Comment
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Re: 1966 A/C DEFROSTER
I have a '66 with A/C, which is in storage and I have not seen it in five months. I will try to go and check it for you. The only theory that I have right now is that the fan is really blowing strong on high or the cable that controls the flapper is not doing its job. Could it be binding a little as it closes and not letting the flapper close all the way?Comment
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Re: 1966 A/C DEFROSTER
Ray Morrison judged the car and when I found all components intact and adjusted correctly and the defroster still fluttered paper on high he was nice enough to show me two non air cars that appeared to have zero leakage on high. That is why I wonder if there is a difference in the ducts or blowers on air cars. To date I now have had six air cars fail the test and none passed. The 67 judge, Keith Biggers , indicates he doesn't check for zero leakage during a PV but that doesn't help on a 66. I would just like to find an air car that does pass and understand the difference. Looking at it and the way it is assembled I see no way to get a positive seal.Comment
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Re: 1966 A/C DEFROSTER
Ray Morrison judged the car and when I found all components intact and adjusted correctly and the defroster still fluttered paper on high he was nice enough to show me two non air cars that appeared to have zero leakage on high. That is why I wonder if there is a difference in the ducts or blowers on air cars. To date I now have had six air cars fail the test and none passed. The 67 judge, Keith Biggers , indicates he doesn't check for zero leakage during a PV but that doesn't help on a 66. I would just like to find an air car that does pass and understand the difference. Looking at it and the way it is assembled I see no way to get a positive seal.Comment
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Re: 1966 A/C DEFROSTER
I am starting to believe you may be right but the NCRS PV judges test doesn't support our theory. Still trying to understand why a non air car doesn't do the same. Does you air duct have a hole in the end of it above where the upside down "Y" connects. I know non air 63s did have such a hole and if there it would eliminate back pressure that pushes air past the side of the flapper. My theory on it at this time.Comment
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Re: 1966 A/C DEFROSTER
I am starting to believe you may be right but the NCRS PV judges test doesn't support our theory. Still trying to understand why a non air car doesn't do the same. Does you air duct have a hole in the end of it above where the upside down "Y" connects. I know non air 63s did have such a hole and if there it would eliminate back pressure that pushes air past the side of the flapper. My theory on it at this time.Comment
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Re: 1966 A/C DEFROSTER
I thought the same but when I got access to it and placed it in the closed position with the cable I then physically pushed the flapper up and it is against the stop. Even holding it there and running the test there is no change. I am only talking about 5% leak by not all but won't pass the PV test. I can see it with the dash out, side panels off and defroster duct removed. There is no binding . Seal is only on the tip of the flapper and about 1.5"-2" up it so I thought it was missing part of the seal and I ordered another seal since this is the original. New one is identical to the original.Comment
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Re: 1966 A/C DEFROSTER
I thought the same but when I got access to it and placed it in the closed position with the cable I then physically pushed the flapper up and it is against the stop. Even holding it there and running the test there is no change. I am only talking about 5% leak by not all but won't pass the PV test. I can see it with the dash out, side panels off and defroster duct removed. There is no binding . Seal is only on the tip of the flapper and about 1.5"-2" up it so I thought it was missing part of the seal and I ordered another seal since this is the original. New one is identical to the original.Comment
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Re: 1966 A/C DEFROSTER
Silly test - that collection of sloppy stampings, rods, and foam rubber was never expected to seal 100%, especially at high blower. Somebody's dreaming.Comment
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Re: 1966 A/C DEFROSTER
Silly test - that collection of sloppy stampings, rods, and foam rubber was never expected to seal 100%, especially at high blower. Somebody's dreaming.Comment
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