Need help sorting heater control vacuum lines
Thread Starter
Instructor
Joined: Nov 2011
Posts: 238
Likes: 30
From: Dallas TX
Need help sorting heater control vacuum lines
Studying page J142 of the ASM, for my 69 no a/c car, I see the vacuum lines and I think I understand the purpose of some of the lines, but I seem to have an extra vacuum line.
The extra line goes through a grommet, viewed from the passenger seat, just above the heater plenum, just to the passenger side of center. Where does this line go? I can pull a vacuum on it, but it doesn't seem to affect anything. Is it going to a heater valve inside the heater box?
It isn't on page J142.
How is it to be hooked up?
The extra line goes through a grommet, viewed from the passenger seat, just above the heater plenum, just to the passenger side of center. Where does this line go? I can pull a vacuum on it, but it doesn't seem to affect anything. Is it going to a heater valve inside the heater box?
It isn't on page J142.
How is it to be hooked up?
Thread Starter
Instructor
Joined: Nov 2011
Posts: 238
Likes: 30
From: Dallas TX
Ah ha!
How funny!
It is the vacuum feed line. The grommet on the fire wall was melted and had sealed off the end of the vacuum line. There was no line hanging out on the engine side of the firewall - it looked simply like a bump on the texture.
How funny!
It is the vacuum feed line. The grommet on the fire wall was melted and had sealed off the end of the vacuum line. There was no line hanging out on the engine side of the firewall - it looked simply like a bump on the texture.
Thread Starter
Instructor
Joined: Nov 2011
Posts: 238
Likes: 30
From: Dallas TX
So a non a/c car doesn't have a heater water control valve? Hot water circulates through the heater core all the time?
I see in some of my searching research that other owners have installed a control valve to keep the heat out of the car.
I'm in Dallas. Seems like a dang good idea to me.
I see in some of my searching research that other owners have installed a control valve to keep the heat out of the car.
I'm in Dallas. Seems like a dang good idea to me.
Thread Starter
Instructor
Joined: Nov 2011
Posts: 238
Likes: 30
From: Dallas TX
The air valve on my car is questionable.
This the the device with a red vacuum line on the driver's side and a blue vacuum line on the passenger side. When vacuum is applied to the red side, the device moves. But I can't pull vacuum on the blue side???? Isn't there just one diaphragm thing inside this device?
I tried different vacuum line just to make sure the blue line hasn't failed.
This the the device with a red vacuum line on the driver's side and a blue vacuum line on the passenger side. When vacuum is applied to the red side, the device moves. But I can't pull vacuum on the blue side???? Isn't there just one diaphragm thing inside this device?
I tried different vacuum line just to make sure the blue line hasn't failed.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Are you talking about the vent hose for the wiper arm relay.. Upper left corner in the picture.... If so, this is just a vent hose for the valve and went no where after it came through the grommet.
Melting Slicks
Joined: Aug 2013
Posts: 2,178
Likes: 111
From: Plains Pa
I'm goin' nutz!!!
Someone please shed light on this problem I'm having...I got a 75 with a/c and want to hook up my heater control valve but cannot find the white vacumn line that plugs into it,it has to come out of the firewall..........should I take the pass. side dash off? Please help!
