Im still thinking it through
85 heater control valve
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
The usual fix is to remove it altogether. Replace the whole assembly with heater hose to and from the heater core. Later models have no valve. I did mine 3 or 4 years ago, no adverse effects. Put a golf tee in the vacuum hose and tuck it out of sight and almost no one will be able to tell.
Burning Brakes
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
I remember this thread from about 5 or 6 years ago. shorty after I read it, I found a NOS valve assembly on fleabay for about $20 or so. anyway, bought the part, down loaded and printed the thread, and tucked it all away for a rainy day. at that time, there were no reproduction valve assemblies available. I still have the parts and instructions, and never used them. the original heater valve assembly on my old 85 is hanging in there at 160K miles.
here's a link for a reproduction assembly -
http://www.ebay.com/itm/1985-1987-Corvette-C4-Heater-Water-Control-Valve/371023573770?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222008%26algo%3DSIC.MOTORS%26ao%3D1%26asc%3D20131003132420%26meid%3D5839289584663629752%26pid%3D100005%26prg%3D20131003132420%26rk%3D3%26rkt%3D6%26sd%3D181092486525&rt=nc
Last edited by Joe C; Mar 30, 2014 at 04:11 AM.
Burning Brakes
Joined: Oct 2012
Posts: 882
Likes: 52
I bought a reproduction valve last year. Fit fined then my heater core went the following month. So, for now I bought the NAPA u bend hose that fits, and the heater core is bypassed. Eventually I will have to tackle the core, but as this isn't my DD I don't mind no heat.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
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Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
If you want to KEEP the hot water control valve, and avoid the "Corvette -Tax" on a OEM replacement, GM used this set up on many different vehicles. You can go to a parts store web site and search various GM/Chev models and find a similar assy for a civilized price
I d/c mine and made a manifold to house a flush T and a bleeder. But like other guys, the heater core blew its guts out 3 weeks ago, so now its got to be fixed right before next November...so I might add the water valve back to the system.
I d/c mine and made a manifold to house a flush T and a bleeder. But like other guys, the heater core blew its guts out 3 weeks ago, so now its got to be fixed right before next November...so I might add the water valve back to the system.
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
If you want to KEEP the hot water control valve, and avoid the "Corvette -Tax" on a OEM replacement, GM used this set up on many different vehicles. You can go to a parts store web site and search various GM/Chev models and find a similar assy for a civilized price
I d/c mine and made a manifold to house a flush T and a bleeder. But like other guys, the heater core blew its guts out 3 weeks ago, so now its got to be fixed right before next November...so I might add the water valve back to the system.
I d/c mine and made a manifold to house a flush T and a bleeder. But like other guys, the heater core blew its guts out 3 weeks ago, so now its got to be fixed right before next November...so I might add the water valve back to the system.
Thread Starter
Advanced
Joined: Feb 2014
Posts: 50
Likes: 0
If you want to KEEP the hot water control valve, and avoid the "Corvette -Tax" on a OEM replacement, GM used this set up on many different vehicles. You can go to a parts store web site and search various GM/Chev models and find a similar assy for a civilized price
I d/c mine and made a manifold to house a flush T and a bleeder. But like other guys, the heater core blew its guts out 3 weeks ago, so now its got to be fixed right before next November...so I might add the water valve back to the system.
I d/c mine and made a manifold to house a flush T and a bleeder. But like other guys, the heater core blew its guts out 3 weeks ago, so now its got to be fixed right before next November...so I might add the water valve back to the system.