1970 Cutlass heater control valve with A/C
April 7th, 2018, 02:36 PM
#1
Registered User
Thread Starter
Join Date: Jun 2009
Location: Aledo, Texas
Posts: 2,386
1970 Cutlass heater control valve with A/C
I’ve seen many versions of heater control valves on ‘68-‘72 A bodies.. Can someone tell me which would be factory issue correct on a ‘70 Cutlass with air conditioning? These pictured are the two that I’ve most seen. Thank you
April 9th, 2018, 11:09 AM
#3
Old School Olds
Join Date: Nov 2008
Location: Marble Falls TX
Posts: 8,941
I know on the 69 and 70 heater valve, they are the small threaded port as shown above.
Also, if you can blow through it, it will be the right one. 69-70 need vacuum
to keep the valve closed. And the 71 up uses the larger threaded port and needs vacuum
to open the valve. At least that is how it was explained to me.
Also, if you can blow through it, it will be the right one. 69-70 need vacuum
to keep the valve closed. And the 71 up uses the larger threaded port and needs vacuum
to open the valve. At least that is how it was explained to me.
April 9th, 2018, 11:12 AM
#4
Old School Olds
Join Date: Nov 2008
Location: Marble Falls TX
Posts: 8,941
Sorry bud, I got that a little backward. If you can't blow through it, it will be the right one.
The 69-70 need vacuum to open the valve. Here's a pic of an aftermarket unit I purchased
for my 70 w/455.
The 69-70 need vacuum to open the valve. Here's a pic of an aftermarket unit I purchased
for my 70 w/455.
Last edited by tru-blue 442; April 9th, 2018 at 11:15 AM.
April 9th, 2018, 12:08 PM
#5
Registered User
Join Date: Dec 2014
Location: Indiana
Posts: 497
Thread
Thread Starter
Forum
Replies
Last Post
jensenracing77
Parts For Sale
0
March 19th, 2014 04:08 PM
