 Cabin heat coming in even with console handle down, Checked the heat valves |
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| oakdalecurtis |
 Mar 29 2017, 04:53 PM
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#1
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Oakdalecurtis  Group: Members Posts: 1,377 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California 
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I kept feeling a small amount of heat coming in on my feet even with the heat control down. I checked the cables and the heater valves underneath the car, it felt like they were closing when I manipulated them. I finally pulled the valves out, and one of them had a nut stuck in the valve gap so it wouldn't close all the way. No idea how the nut could have gotten there, but it's nice to drive now without the heater leaking into the cabin! Btw, I had no use for the disconnected CAT and EGR lights on the dash, so I black plugged one light and connected the other to the cabin heat switch. Now when I pull the console lever to get heat, a red light goes on in the dash to remind me that heat is on.
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| mgphoto |
Mar 29 2017, 05:39 PM
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#2
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"If there is a mistake it will find me" Group: Members Posts: 1,375 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
Photo???
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| oakdalecurtis |
Mar 29 2017, 10:18 PM
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#3
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Oakdalecurtis Group: Members Posts: 1,377 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California
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Off, then On pic:
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| r_towle |
Mar 30 2017, 08:51 AM
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#4
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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There is a rubber seal in the flapper box, on the round flapper, that degrades over 40 years and allows leaks to happen. If it's still hot, change the mixture to include fresh air
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| barefoot |
Mar 31 2017, 08:43 AM
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#5
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Senior Member Group: Members Posts: 1,415 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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QUOTE(r_towle @ Mar 30 2017, 10:51 AM)  There is a rubber seal in the flapper box, on the round flapper, that degrades over 40 years and allows leaks to happen. If it's still hot, change the mixture to include fresh air Huh??? how do you do that? the flapper is either closed to the cabin or the atmosphere discharge or somewhere in between. I expect you can get in there and use some hi temp RTV to re-nue the flapper seal. |
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| rhodyguy |
Mar 31 2017, 08:52 AM
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#6
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,249 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
The heated air and cooler outside air can be mixed/blended with the dash controls but that won't be of much help on hot days. Is one dash outlet warmer than the other side when the center tunnel lever is pushed down (valves closed)?
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| Dave_Darling |
Mar 31 2017, 04:46 PM
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#7
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914 Idiot Group: Members Posts: 15,209 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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I remember that the flap inside the flapper valve is actually two pieces, riveted together. If the rivet fails the two pieces can separate, and that can send (at least some!) warm air into the interior at all times.
Alan Caldwell recommended using a nut and bolt to replace the rivet if the latter fails. (Unless I'm thinking of some other valve that fails in this way....) --DD |
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| IronHillRestorations |
Apr 1 2017, 06:42 AM
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#8
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I. I. R. C. Group: Members Posts: 6,841 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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I had a car in that had the same problem. It was a broken impeller vane that got lodged in the flapper box and kept it open a little
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| mepstein |
Apr 1 2017, 07:01 AM
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#9
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914-6 GT in waiting Group: Members Posts: 19,992 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(Dave_Darling @ Mar 31 2017, 06:46 PM) I remember that the flap inside the flapper valve is actually two pieces, riveted together. If the rivet fails the two pieces can separate, and that can send (at least some!) warm air into the interior at all times. Alan Caldwell recommended using a nut and bolt to replace the rivet if the latter fails. (Unless I'm thinking of some other valve that fails in this way....) --DD I fixed mine that way. Just a little heat on a hot summer day is too much! |
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| r_towle |
Apr 1 2017, 08:50 AM
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#10
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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I removed the flexible hoses in the summer....that also worked
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