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post #1 of (permalink) Old 01-06-2001, 10:36 AM
joeybcdt
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Need heater hose valve?

Today, I'm gonna start replacing my heater core and fan motor. I noticed that there is a valve on the incoming heater hose. Someone told me that this was there to prevent hot air from coming in the cab in the summer. When I first started seeing heater problems, the first thing I did was remove and check the valve. It was badly corroded and wasn't opening fully. I cleaned it up and reinstalled. Should I just remove the valve all together? I just seems like a weak link to me. Could this valve have caused my heater core to go bad in the 1st place?

Joey

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post #2 of (permalink) Old 01-06-2001, 02:23 PM
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Re: Need heater hose valve?

This valve is there to keep hot water from going to the heater core when you have your controls set to cold. This way the heater and box stay cooler as a whole. Did your jeep come with A/C?
That is the most common ones using the heater/water control valve.
You don't absolutly have to have it. If it has A/C keep it for sure.
Either way......replace it with a new one. They are known for leakage when they get old and corrode.They are also pretty cheap.


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post #3 of (permalink) Old 01-06-2001, 08:04 PM
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Re: Need heater hose valve?

I actually thought about installing one of these to keep the heat down in the summer when I had to keep the hard top on on long trips/etc. I was worried that this would restrict vital waterflow to the engine. Is this not a problem? It would be nice to recirculate just air instead of heat in the summer months!


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post #4 of (permalink) Old 01-07-2001, 01:06 PM
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Re: Need heater hose valve?

Jay , you can blockit off no problem. Won't hurt a thing.
Just make sure to block the hose that goes from the thermostat to the heater. Thats the inlet.


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post #5 of (permalink) Old 01-08-2001, 07:16 AM
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Re: Need heater hose valve?

On a 258 there is no bypass so if you block off the water from circulating the water stays in the head/block untill the thermostat gets enough heat by convection to open up. The water temp spikes real high. This is observed from my installing a heater shutoff valve. So I used two water valves(1/2" copper), one to shutoff the flow for summer and one to shutoff bypass for winter
heater core------valve-------\----------------engine
.....................................\
....................................valve
.......................................\
........................................\
heater core-------------------------\---------engine
The bypass valve goes between two tees on engine side. Heater box is stone cold in summer. My dad did this to a '66 Chrysler wagon w/o air. Before your legs and feet would sweat in summer.



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