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Heater Hose Water Shut-Off

 
Old 02-02-2019, 11:11 PM
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Jason R Swayden
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Default Heater Hose Water Shut-Off

Where does that little hollow tube go that sits on top of the heater hose water shut off valve? Its in like 3 pieces so I need to know where to route the new one to.

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Old 02-03-2019, 12:13 AM
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FAUEE
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Theres a vacuum line that comes from inside the car, under the passenger dash.

Later years dont have anything from what I understand.
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Old 02-03-2019, 12:27 AM
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Jason R Swayden
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You know where in the passenger dash it hooks up to? Im clueless.
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Old 02-03-2019, 12:38 PM
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hcbph
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Have not looked at this one but something similar is my one Cutlass went to a vacuum port on the heater/ac control. I assume this one is the same.
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Old 02-03-2019, 01:37 PM
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FWIW Rotting heater cores have been a problem with early C4s from the beginning. By shutting off coolant flow to the heater core causes corrosion and leaks. Later models had this valve removed. IMHO you might consider locking that valve open and forget searching and connecting the vacuum line. I did this in my 86 and didn't notice any temp differences in the cabin during the hot season.
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Old 02-06-2019, 06:21 AM
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Jason R Swayden
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Default how to lock the heater valve option

Originally Posted by JrRifleCoach View Post
FWIW Rotting heater cores have been a problem with early C4s from the beginning. By shutting off coolant flow to the heater core causes corrosion and leaks. Later models had this valve removed. IMHO you might consider locking that valve open and forget searching and connecting the vacuum line. I did this in my 86 and didn't notice any temp differences in the cabin during the hot season.

How would one lock the valve open? I'm thinking about wiring the stock vacuum line to wherever the hell it goes (still don't know). But it would be handy to know how to lock it open. Thanks
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Old 02-06-2019, 01:04 PM
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Heres a pic of the valve with a black cleco I used for testing.
Later replaced with a bolt and nut.

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Old 02-06-2019, 03:06 PM
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Originally Posted by JrRifleCoach View Post
Here's a pic of the valve with a black cleco I used for testing. Later replaced with a bolt and nut.
Are you sure that's the "open" position? Mine works the other way. Vacuum closes the valve, and lack of vacuum opens the valve.



Try it. With the engine running (so you have vacuum), and heater off, what is the valve position? Turn on your heater, and what is the valve position?

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