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#1
11-05-2023, 06:36 PM
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What is this thing on the heater hose
In checking out my engine for a change to a more factory type air cleaner, I pulled off the 14" open element air cleaner and tried on the factory style one only to discover the new filter assembly sat on top of this round black thing connected to the heater hose. The unknown thing had a small vacuum hose going to a small metal thing underneath it. I've seen other GTO's at shows that did not have this round black thing. Before messing with it I better find out what it is and what it does.
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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#2
11-05-2023, 06:43 PM
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It’s a vacuum operated heater control valve.
It turns off the flow of water into the heater core when you have the AC on so there not fighting each other.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
11-05-2023, 07:04 PM
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If this is on your 68 GTO, someone added it. 68s didn't use a heater valve.
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Ed 1968 GTO (Thanks Mom) 2006 Silverado 2007 Cadillac SRX 2015 Chevy Express  
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#4
11-05-2023, 07:12 PM
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Quote:
__________________
"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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#5
11-05-2023, 10:56 PM
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Some folks add heater-control valves because the air door(s) inside the ductwork don't seal properly. Then the A/C becomes weak, and--if the car was used in actual winter--the heater would also be weak, both from air bleeding into the desired system from the un-desired system.
The heater control valve could be there to improve A/C performance, because it's easier to cram an aftermarket heater valve in the hose, than to tear-apart the under-dash HVAC plenum. |
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#6
11-06-2023, 10:26 PM
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My thanks to steve25, OG68, and Schurkey for their great info on my little mystery. The heater valve sounds like a good thing to have so its a keeper. I will deal with the air cleaner problem another way.
__________________
"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ |
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#7
11-07-2023, 06:45 AM
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You try loosening the hose clamps and rotating the valve down for more clearance?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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