Heat riser valve thing
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Elder User
Joined: Sep 2002
Posts: 936
Likes: 1
From: Texas
Heat riser valve thing
Hey yall. I had my engine rebuilt a month or so ago and today while I was puting on a new exhaust I noticed that the valve deal on the driver's side exhaust manifold wasnt hooked to anything. Looks like a vacume line is supposed to be hooked on there. I dont see any loose lines or anything and the idle is fine, so I'm guess ing the rebuilders yanked it or lost it or just over looked it. Anyways, I have a new vaccume line but have no idea where it's suppost to go to. Any ideas?
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
It's to help the engine warm up faster when it's cold outside.
It controls the tempurature of the air going inside the air cleaner, and into the carb.
If it is really cold outside the valve never opens, alowing heated air to enter the carb to help prevent it from iceing up.
On real hot days the door may never close.
A line should run from manifold vacuum to the A/CL BI MET (Air Cleaner Bi Metal temperature valve), located on the air cleaner (It's metalic with two vac ports on it), from there another line should go to a Thermal Vacuum Switch. (TVS) also located on the air cleaner, (Plastic and Color coded, could be blue, gray, white, red, etc.. has two vac ports on it.) and from there it should hook to the heat riser door valve, located on the air cleaner snorkle. The heat riser vacuum motor operates the door inside the snorkle.
hope this helps.
It controls the tempurature of the air going inside the air cleaner, and into the carb.
If it is really cold outside the valve never opens, alowing heated air to enter the carb to help prevent it from iceing up.
On real hot days the door may never close.
A line should run from manifold vacuum to the A/CL BI MET (Air Cleaner Bi Metal temperature valve), located on the air cleaner (It's metalic with two vac ports on it), from there another line should go to a Thermal Vacuum Switch. (TVS) also located on the air cleaner, (Plastic and Color coded, could be blue, gray, white, red, etc.. has two vac ports on it.) and from there it should hook to the heat riser door valve, located on the air cleaner snorkle. The heat riser vacuum motor operates the door inside the snorkle.
hope this helps.
Thread Starter
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Elder User
Joined: Sep 2002
Posts: 936
Likes: 1
From: Texas
Welp I guess that's why it aint hooked up. When I bought my truck the stock intake was long gone and one of those round chrome ones with a K&N was in it's place. Oh well. Thanks for yall's help.
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