Heater Control Valve - ClassicOldsmobile.com


Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old November 12th, 2017, 02:08 PM   #1
cus
Registered User
Thread Starter
 
cus's Avatar
 
Join Date: Apr 2014
Posts: 174
Heater Control Valve

Hello,
I've removed all the a/c from the 350, I've just retro fit an aftermarket heater/demister under the dash. I've connected up the heater hoses, from the control valve to the heater & the hose back to the pump. My old control valve has no vacuum hose connected. I have an in-line on/off valve in the
feed hose that I can cut off flow to the core when I wish. Seem to have restricted flow though, is it because of no vacuum on the control valve?

regards, cus
cus is offline   Reply With Quote
Old November 12th, 2017, 02:25 PM   #2
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 27,398
Quote:
Originally Posted by cus View Post
Hello,
I've removed all the a/c from the 350, I've just retro fit an aftermarket heater/demister under the dash. I've connected up the heater hoses, from the control valve to the heater & the hose back to the pump. My old control valve has no vacuum hose connected. I have an in-line on/off valve in the
feed hose that I can cut off flow to the core when I wish. Seem to have restricted flow though, is it because of no vacuum on the control valve?

regards, cus
It depends on the year and model (which you did not tell us). For the A-body cars, 1972-earlier have normally closed valves that require vacuum to open. 1973-up have normally open valves that require vacuum to close.

For the full size cars, 1970-older have normally closed, 1971-up have normally open.

Of course, if someone installed the wrong valve, all bets are off.
joe_padavano is online now   Reply With Quote
Old November 12th, 2017, 03:00 PM   #3
cus
Registered User
Thread Starter
 
cus's Avatar
 
Join Date: Apr 2014
Posts: 174
Thanks Joe,
Car is a 1973 Delta 88, valve looks pretty original
cus is offline   Reply With Quote
Old November 13th, 2017, 09:26 AM   #4
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 27,398
Quote:
Originally Posted by cus View Post
Thanks Joe,
Car is a 1973 Delta 88, valve looks pretty original
The original valve for a 1973 D88 is normally open and should present no restriction without vacuum applied. Are both hoses to the heater warm when the engine is warmed up?
joe_padavano is online now   Reply With Quote
Old November 13th, 2017, 01:45 PM   #5
cus
Registered User
Thread Starter
 
cus's Avatar
 
Join Date: Apr 2014
Posts: 174
I investigated more last night, flushed the heater core, hooked up to the manifold,
all was flowing OK, was blocked at the water pump, had calcified a bit in the base of the tube, cleaned out & presto, has been bunged off for quite a few years I think.
Thanks for your help
cus is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
66 heater control valve (water control valve) jensenracing77 Parts For Sale 0 March 19th, 2014 05:08 PM
Heater Control Valve Elec. terminal? zodiacblueS Electrical 4 April 7th, 2012 03:38 PM
Jury-rigging heater control valve Mister Other 10 May 13th, 2011 04:53 PM
heater control valve blue72regency Big Blocks 8 December 12th, 2007 02:12 PM
Heater control valve bjtstarfire Other 3 December 15th, 2006 11:14 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -7. The time now is 12:14 PM.


All content Copyright 2017 by Internet Brands, Inc. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.