Help identifying vacuum hose
Thread Starter
Advanced
Joined: Jun 2011
Posts: 73
Likes: 0
Help identifying vacuum hose
When replacing my heater hose, I noticed a yellow vacuum hose (in picture) that has a hole in it. Can anyone help me identify what this vacuum hose is and what the effect of it being non functional is (besides not being a vacuum anymore 
? It looks like hell on earth to replace as it appears to go behind the distributor cap and into the car (near the dashboard area).
? It looks like hell on earth to replace as it appears to go behind the distributor cap and into the car (near the dashboard area).
Instructor
Joined: Oct 2010
Posts: 113
Likes: 5
From: Dwingeloo Netherlands
I think this is the hose to the heater shut off valve; the vac hose will lead to the shut off valve which is mounted on the manual regulator lever, and would actuate when the lever is completely in the 'cold' [blue] position.
This lever controls the mixer flap in the heater, but also closes the hot water to the heater radiator.
Hence you have an vacuum leak, when the heater is on 'cold'
Cor
This lever controls the mixer flap in the heater, but also closes the hot water to the heater radiator.
Hence you have an vacuum leak, when the heater is on 'cold'
Cor
Safety Car
Joined: Jun 2004
Posts: 4,364
Likes: 221
From: Beecher Illinois
That's the heater hose shutoff valve. When the 'temp' control is on COLD it should shut that valve cutting off flow through the heater core.
There should be a plunger type valve on top of the heater core housing. That's the other end of the vacuum line.
There should be a plunger type valve on top of the heater core housing. That's the other end of the vacuum line.
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
It runs behind the distributor and in to the firewall grommet. From there it runs to the switch on top of the heater box.
