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10-02-2009, 03:50 PM | #1 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
Posts: 575
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New Heater Valve NO HEAT???
ok i have a 72 jimmy with A/C, i was always getting heat, so i replaced the heater shut off valve, and now i get nothing but cold air??? I thought i had it on backwards so i turned it around but still the same???
Any ideas thanks Vance |
10-02-2009, 04:00 PM | #2 |
Project Junkie! Fishing Poor!!
Join Date: Dec 1999
Location: Olympia,Wa. 98512
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Re: New Heater Valve NO HEAT???
2 things to check. 1 is the valve working? If not do you have good vacuum going to it? 2 Is your system full of water? WES
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10-02-2009, 04:19 PM | #3 |
member #16
Join Date: Dec 1999
Location: Yuba City Ca.
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Re: New Heater Valve NO HEAT???
Do you have the right valve? some open with vacuum others close with vaccuum. Just a thought.
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10-02-2009, 04:20 PM | #4 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
Posts: 575
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Re: New Heater Valve NO HEAT???
Not sure how to check if it is working?? Where is the main vacuum block for this? and plenty of water. The old one was not shuting off so i was getting hot air all the time, there is a vent under the cowl that is ran by a vacuum as well??
thanks |
10-02-2009, 04:21 PM | #5 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
Posts: 575
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Re: New Heater Valve NO HEAT???
It was the one that LMC had?? Ihope it was the right one.
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10-02-2009, 04:49 PM | #6 |
member #16
Join Date: Dec 1999
Location: Yuba City Ca.
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Re: New Heater Valve NO HEAT???
Might check the source. Looks like it should heat with no vacuum to the valve. Good luck.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 10-02-2009 at 04:51 PM. |
10-02-2009, 05:18 PM | #7 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
Posts: 575
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Re: New Heater Valve NO HEAT???
where is the source? and were is the control head vacuum switch, i am assumming that it is under the dash somewere???
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10-02-2009, 05:46 PM | #8 |
member #16
Join Date: Dec 1999
Location: Yuba City Ca.
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Re: New Heater Valve NO HEAT???
Goes from the vacuum reservoir to the backside of the a/c control on the dash. Some models have three lines on the control instead of two with a tee as shown.
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10-02-2009, 06:23 PM | #9 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
Posts: 575
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Re: New Heater Valve NO HEAT???
ok found the control head switch, the lever that ran it was broke, now fixed, also i found the vacuum res. it had no vacuum lines at all, i found the one from the switch, but i still dont know where the source is?? What does the vacuum source look like, is it off the carb??
Sorry for the trouble thanks Vance |
10-02-2009, 07:01 PM | #10 |
member #16
Join Date: Dec 1999
Location: Yuba City Ca.
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Re: New Heater Valve NO HEAT???
Vance, the source is anyplace you can find full vacuum. Ususally on the intake manifold fitting behind the carb, or off of the carb itself.
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10-02-2009, 07:03 PM | #11 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
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Re: New Heater Valve NO HEAT???
LOL ya figured that one out, been a long day, i have it all hooked up and still not enough vacuum to open the valve, i can suck it open so i know its working, i guess ill head out and tinker some more. Thanks for all the help
vance |
10-02-2009, 07:18 PM | #12 |
member #16
Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: New Heater Valve NO HEAT???
Sometimes the lines just get old and split or crack or fall off. sound like you're on the right track.
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10-02-2009, 07:22 PM | #13 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
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Re: New Heater Valve NO HEAT???
Ok what does the vacuum resorvior actually do? can i bypass this totally, if i hook up each of the vacuum valves to the main source they work fine, but it seems like when i hook up the res i loose suction??
thanks Vance Last edited by VanceH; 10-02-2009 at 07:22 PM. Reason: spelling |
10-02-2009, 07:41 PM | #14 |
member #16
Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: New Heater Valve NO HEAT???
Without the reservoir your valve will shut off everytime your vacuum drops from acceleration etc. Best to keep it or replace it at some point.
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10-02-2009, 07:56 PM | #15 |
Loving the Jimmster
Join Date: Jun 2008
Location: Emmett, idaho
Posts: 575
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Re: New Heater Valve NO HEAT???
it seems broke is there a way to test it??
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