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07-07-2017, 05:01 PM
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#1 |
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Registered User
Join Date: Sep 2011
Location: Leland, Il
Posts: 1,503
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What is this?
Under the hood of my 70 gmc jimmy 350 w/ac and I notice an old leaky valve....is this a heater control valve? Doesnt look like the books but it appears to have the heater cable (or vent) attached to it.
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07-07-2017, 05:09 PM
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#2 |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,235
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Re: What is this?
Looks like it.
-klb
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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07-07-2017, 05:12 PM
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#3 |
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Registered User
Join Date: Aug 2016
Location: Shelburne, VT
Posts: 46
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Re: What is this?
Looks like an aftermarket valve, but I could be wrong. I put one in my truck to stop the hot air coming out of the heater under the dash.
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07-07-2017, 05:38 PM
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#4 |
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Registered User
Join Date: Sep 2011
Location: Leland, Il
Posts: 1,503
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Re: What is this?
Does anybody have a closeup picture of an original one installed? In the mean time Ill do an internet search. Thanks for the replies...better replace this one.
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07-07-2017, 05:48 PM
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#5 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,731
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Re: What is this?
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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07-07-2017, 06:04 PM
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#6 |
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Registered User
Join Date: Sep 2011
Location: Leland, Il
Posts: 1,503
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Re: What is this?
Thanks!
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07-11-2017, 06:45 PM
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#7 |
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Registered User
Join Date: Sep 2011
Location: Leland, Il
Posts: 1,503
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Re: What is this?
Ok....bought the correct valve, same as pictured. The one I had installed that I showed in my picture had (what I'm guessing to be) a heater control cable hooked to it. The factory doesnt have that...only an inlet outlet for coolant and a vacuum port. Where the heck did they get the cable that hooked to my after market valve and where can I put it?
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07-11-2017, 06:53 PM
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#8 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,731
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Re: What is this?
Good question, since it was a non-factory part. Trace it out to see where it goes, probably a hand-operated lever or something that a PO installed. Under the dash maybe, where a driver could reach it. After you find it, you'll probably want to remove it.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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07-11-2017, 06:56 PM
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#9 |
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Registered User
Join Date: Sep 2011
Location: Leland, Il
Posts: 1,503
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Re: What is this?
Ill have to do that. Ive been scouring the forum and have pictures of original valve and there is not any cables. So the original owner must have farted with this too...as well as a lot of the wiring...he loved lights.
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07-12-2017, 03:44 PM
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#10 |
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Registered User
Join Date: Sep 2011
Location: Leland, Il
Posts: 1,503
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Re: What is this?
Traced it into the cab and found it was put under the dash. I initially thought it was a manual choke but turned out to be attached to the heater control valve. Its all gone now, put an original back in.
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07-12-2017, 05:39 PM
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#11 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,731
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Re: What is this?
Excellent!
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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07-12-2017, 10:17 PM
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#12 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: What is this?
The orignal's are not always the best solution. The vacuum has to work good on the system and even then it's not a sure thing. I put a manual valve in the heater line also to ensure good cold AC in the summer. The manual valve is a good 10* cooler in the cab if the vacuum valve isn't working properly.
If you don't have AC then it want matter! 
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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