Name of this Switch?
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,793
Likes: 58
From: God's Country The Old Dominion
Name of this Switch?
The light colored switch on top of the A.C. duct. It has two screws however my new harness has a plug. I am trying to find out if it's the correct one.
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,793
Likes: 58
From: God's Country The Old Dominion
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
That is the vacuum switch that allows you to close off the vacuum to your hot water shut off valve when you have your A/C on. when you move your 'HOT-COLD' arm on your heater control in the console/shifter plate area...you will see the cable move and contact a plunger in this vacuum switch.
You did not state the year...nor did you state if what appears to be electric connectors in that area...if they are truly that or not.
Also that spring in the upper right corner of this photo should not be there.
I do not understand what you wrote about how your 'new harness has a plug'??? What type of harness...electrical or vacuum????
The more descriptive of information given (with or without a photo) better 'paints' a good picture so proper information and advice can be given.
DUB
You did not state the year...nor did you state if what appears to be electric connectors in that area...if they are truly that or not.
Also that spring in the upper right corner of this photo should not be there.
I do not understand what you wrote about how your 'new harness has a plug'??? What type of harness...electrical or vacuum????
The more descriptive of information given (with or without a photo) better 'paints' a good picture so proper information and advice can be given.
DUB
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
IF it is a 68....I have not seen this vacuum switch on top of the heater box...that vacuum switch came later...but it actually still can be used to shut off the hot water. I just recently did just that on a 1974 so when the A/C was set to any setting (Max, normal, bi-level)....as long as the roller wheel was rolled all the way to the top...there would be NO hot water getting into the heater core.
DUB
DUB
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,793
Likes: 58
From: God's Country The Old Dominion
IF it is a 68....I have not seen this vacuum switch on top of the heater box...that vacuum switch came later...but it actually still can be used to shut off the hot water. I just recently did just that on a 1974 so when the A/C was set to any setting (Max, normal, bi-level)....as long as the roller wheel was rolled all the way to the top...there would be NO hot water getting into the heater core.
DUB
DUB
Last edited by Too Slow '90; Sep 16, 2014 at 03:49 PM.
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Team Owner
Joined: Jan 2006
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Likes: 3,118
From: Crossville TN
Not every 'alteration' to a vintage car is "bad". Sometimes, owners make UPDATES or improvements that the factory made in later models. Just because "it wasn't like that from the factory" doesn't mean the change/modification wasn't useful nor wasn't done well.
Whenever you find a 'difference' that you don't expect, investigate to find its purpose and test to see how well it works. You may want to leave it "as is".
Whenever you find a 'difference' that you don't expect, investigate to find its purpose and test to see how well it works. You may want to leave it "as is".
Drifting
Joined: Apr 2008
Posts: 1,305
Likes: 2
From: Lewisburg WV
thegazman
Corvette Central used to sell an electric vacuum switch conversion made by Corvette Clinic (now out of business). There was a switch that attached to bottom of your heat control that operated the electric vacuum switch on top of your heater. This was supposed to prevent the spring in the mechanical vacuum switch from opening the heater door from vibration while driving.
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,793
Likes: 58
From: God's Country The Old Dominion
Not every 'alteration' to a vintage car is "bad". Sometimes, owners make UPDATES or improvements that the factory made in later models. Just because "it wasn't like that from the factory" doesn't mean the change/modification wasn't useful nor wasn't done well.
Whenever you find a 'difference' that you don't expect, investigate to find its purpose and test to see how well it works. You may want to leave it "as is".
Whenever you find a 'difference' that you don't expect, investigate to find its purpose and test to see how well it works. You may want to leave it "as is".
