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Old 12-22-2003, 10:27 PM
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Could this be a bad Water Pump??

I have a 1965 Plymouth Belvedear 273 V8 engine, automatic transmission, no air.

While trying to discover why my heater has stopped working I started to feel water hoses after the engine warmed up and reached operating temperature for about 10 minutes, and it is a little strange.

The two heater hoses are so hot you can't hold on long, the upper radiator hose is mildly warm, and the lower radiator hose is almost cold. Could this be a bad water pump?

The engine never over heats, reaches operating temperature in 7 minutes, heater core cleaned recently, good air flow across core, shut off valve on core was removed, but the heater only blows cold air. (The heater worked fine for about 30 days) Any ideas.

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Old 12-22-2003, 10:49 PM
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Its not a bad water pump or you would (1) hear it, (2) it would leak, or (3) the engine would overheat. If tyhe heater hoses are hot then they are circulating water through the heater core. If the heater is blowing cold air then its not running air through the heater core. I would check the vents under your dash to make sure a cable hasn't broken or a vacume hose hasn't come off. I think you are just blowing cold vent air.

I think the heater hoses come off the manifold below the thermostat, so they will circulate hot water before it opens.

Good luck,

Bluesman
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Old 12-23-2003, 02:35 AM
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It does sound like your system uses a heater door to route the air through the core, and this door is not opening to the heater box.
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Old 12-23-2003, 05:21 AM
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You may need to back flush your heater core? try disconnecting the heater hoses and flush with garden hose but watch the water pressure! You will be surprised of the crap that will come out of it! and check the blend air door in the heater box as said above.
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Old 12-23-2003, 08:59 PM
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I can't tell you how gratefull I am that you guys were able to solve my problem. I have been loosing sleep over this for a week so this is a load off my chest.

When the heater stopped working I discovered a box under the dash that one vacuum line came in from the intake manifold, and had three outgoing vacuum lines. This box would not hold a vacuum so I knew it was bad. All of the other vacuum diaphram operated doors were OK. I don't know what you call this and doubt I would ever find a replacement, so I plugged the vacuum port on the intake manifold and opened the air inlet door, and the air outlet door. When I turned on the heater I felt the air coming out like always only it was cold. The third door is out of site near the top and I failed to open that. When I did, I had heat. I have 20 service manuals and not one had any information on serviceing the heater so you guys are a god send.

Now does anyone know what that box I referred to is called and if it would be possible to repair or replace it? Thanks so much for the help.
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Old 12-26-2003, 10:51 AM
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no genius here , but i believe that would be the "heater core".
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Old 12-26-2003, 11:12 AM
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Edited.

Last edited by 4 Jaw Chuck; 12-26-2003 at 12:35 PM.
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Old 12-26-2003, 11:46 AM
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HotRod, don't pay any attention to little punks like keithrock. They just have nothing better to do than come on boards like this and put people down. I'm glad you got it fixed and I hope you find a replacement!
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Old 12-26-2003, 10:02 PM
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Vacuum control box

The box I was referring to is some type of vacuum manifold control panel and has nothing to do with the heater core other than opening and closing air passageways to the heater core.
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Old 12-27-2003, 12:25 AM
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heater control

Am not sure but I think I have heard them refered to as a blend door.
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Old 12-27-2003, 02:04 AM
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On a Pontiac it would probably be a vacuum switch valve, but on a Plymouth I won't have a guess. Your best bet would be contacting someone that specializes in parting out Mopars for a used replacement. Is there any way to take it apart and see where you are loosing vacuum? Usually there's an o-ring or two and a gasket that might go bad. Maybe you could patch it up where it might give you a few more years of service.
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