climate control hiss
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Joined: May 2003
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From: Benbrook, Texas
climate control hiss
Hi,
I know there is a specific forum for this, but I've gotten my best info from the 73-79 usuals!
My '79 F-150 is an A/C truck, and everything in the climate control system works as it should. My system does hiss a little when I move the two levers and vacuum is distributed through the different lines, but only for a second or so...once the right flaps are open/closed it stops. Is this normal? A friend heard it and commented that I had a vacuum leak, but I'd always assumed I was just hearing the tubing empty out as vacuum was directed to it.
I worked for a man who had a '79 F-250 4x4 Camper Special in the early 80's. It was perfect, but I remember it also hissed.
I did dig into my dash this afternoon to have a quick look and none of the tubing looks too rough and it all seems to be secured.
Just wondered if your trucks do the same.
Thanks in advance,
Bob
I know there is a specific forum for this, but I've gotten my best info from the 73-79 usuals!
My '79 F-150 is an A/C truck, and everything in the climate control system works as it should. My system does hiss a little when I move the two levers and vacuum is distributed through the different lines, but only for a second or so...once the right flaps are open/closed it stops. Is this normal? A friend heard it and commented that I had a vacuum leak, but I'd always assumed I was just hearing the tubing empty out as vacuum was directed to it.
I worked for a man who had a '79 F-250 4x4 Camper Special in the early 80's. It was perfect, but I remember it also hissed.
I did dig into my dash this afternoon to have a quick look and none of the tubing looks too rough and it all seems to be secured.
Just wondered if your trucks do the same.
Thanks in advance,
Bob
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
1973 thru 1979 F150/350~all with a/c.
Originally Posted by califasbob
Hi,
I know there is a specific forum for this, but I've gotten my best info from the 73-79 usuals!
My '79 F-150 is an A/C truck, and everything in the climate control system works as it should. My system does hiss a little when I move the two levers and vacuum is distributed through the different lines, but only for a second or so...once the right flaps are open/closed it stops. Is this normal? YES and NO..it depends on how long it hisses. Once the lever is moved, any hissing should stop.
Bob
I know there is a specific forum for this, but I've gotten my best info from the 73-79 usuals!
My '79 F-150 is an A/C truck, and everything in the climate control system works as it should. My system does hiss a little when I move the two levers and vacuum is distributed through the different lines, but only for a second or so...once the right flaps are open/closed it stops. Is this normal? YES and NO..it depends on how long it hisses. Once the lever is moved, any hissing should stop.
Bob
D5TZ-19B888-A .. A/C Vacuum Selector Control Valve (Motorcraft YH-285)
Last edited by NumberDummy; Apr 22, 2007 at 05:39 PM.
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Joined: Jan 2008
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Can you point out where you hear the hiss ?
http://www.clubfte.com/users/mil1ion...Hosehookup.jpg
http://www.clubfte.com/users/mil1ion/76_79w_AC.jpg
http://www.clubfte.com/users/mil1ion...Hosehookup.jpg
http://www.clubfte.com/users/mil1ion/76_79w_AC.jpg
Last edited by Mil1ion; Apr 22, 2007 at 06:19 PM.
Thread Starter
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Senior User
Joined: May 2003
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From: Benbrook, Texas
Great information, thanks. There are two areas where tubing goes in, three on the top of the unit, and five (I think) on the bottom. Each of these two connection points has an opaque rubber boot that serves as a coupler to the plastic ports on the "ACVSC". I think the the three going into the top boot are quiet, and that the bottom five are where I hear the hiss.
I'd guess that the longest it hisses is between 1-2 seconds. Idle changes slightly, but hardly at all (even when not engaging the AC compressor).
Bob
I'd guess that the longest it hisses is between 1-2 seconds. Idle changes slightly, but hardly at all (even when not engaging the AC compressor).
Bob
Thread Starter
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Senior User
Joined: May 2003
Posts: 160
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From: Benbrook, Texas
Sorry, Dennis...I didn't look before submitting. I'd say it's at the 8 point connector on the bottom (the second link you sent).
Thanks!
Bob
Thanks!
Bob
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Post Fiend
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From: Saskatoon Saskatchewan
Mine 93 does it as well even with def mix and floor in winter time when its shut off i think its normal
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