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Unread 10-25-2013, 11:39 PM   #1
bamxj
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bypass heater control valve for heat?

I have a 90 Cherokee limited, no heat. Wanna bypass heater control valve for heat throughout winter, would this method work after flushing the heater core for temporary heat to keep the kids warm? Also.... would I be able to cut off the valve to reconnect steel line to the rubber hose instead of buying hose to do a direct bypass? If I do this and the motor continued to heat up past 210, what other problems could be cause of over heating? Also wondering if all vents would work as normal if the vacuum line remains attached to the valve after being cut from the coolant line, or if plugging the line would be effective as well... thanks for reading

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Unread 10-25-2013, 11:55 PM   #2
1990JEEPXJ
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Remove valve. Enjoy reliable heat. Makes no difference in how vents work
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Unread 10-26-2013, 01:16 AM   #3
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I second dumping it. Just swapped to open on my 87 and cut that out and haven't looked back at and heat are ok
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Unread 10-26-2013, 08:41 AM   #4
chris87xj
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Remove valve and route coolant lines directly to heater core. Throw valve away and plug vacuum line. Enjoy the heat.
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Unread 10-26-2013, 11:47 AM   #5
Paradise XJ
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If the OP eliminated the HCV in his closed system he'd need to re-plumb the pressure bottle or just swap the whole thing over to an open system.

But I agree about the HCV. Both my rigs are swapped over to open systems and neither have valves. Heat works great.
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Unread 10-26-2013, 07:09 PM   #6
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If the OP eliminated the HCV in his closed system he'd need to re-plumb the pressure bottle or just swap the whole thing over to an open system.

But I agree about the HCV. Both my rigs are swapped over to open systems and neither have valves. Heat works great.
No need to replumb anything. Eliminate the valve and put a piece of tubing in it's place.
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Unread 10-27-2013, 04:30 PM   #7
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Why is that monstrosity there in the first place? Could one just put a cable operated valve in place of it and choose when to shut the hot water off?
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Unread 10-27-2013, 04:37 PM   #8
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Why is that monstrosity there in the first place? Could one just put a cable operated valve in place of it and choose when to shut the hot water off?
Redundancy. Over-engineering. Just put a tube in it's place. Plug the vacuum line to the valve that is now gone. I live in Arizona and have no HCVs on my three Jeeps.
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Unread 10-28-2013, 03:01 AM   #9
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Quote:
Originally Posted by bamxj View Post
I have a 90 Cherokee limited, no heat. Wanna bypass heater control valve for heat throughout winter, would this method work after flushing the heater core for temporary heat to keep the kids warm? Also.... would I be able to cut off the valve to reconnect steel line to the rubber hose instead of buying hose to do a direct bypass? If I do this and the motor continued to heat up past 210, what other problems could be cause of over heating? Also wondering if all vents would work as normal if the vacuum line remains attached to the valve after being cut from the coolant line, or if plugging the line would be effective as well... thanks for reading
Have you determined that there is an actual problem with the valve? Is it stuck closed?
And are you also having a problem with the engine over heating? (Silly question, it's a Jeep after all...)
Maybe both issues are being caused by an air pocket in the system??
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Unread 10-29-2013, 09:36 PM   #10
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We have heat! Thanks for the help!
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Unread 10-29-2013, 09:36 PM   #11
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woohoo!
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Unread 10-29-2013, 09:39 PM   #12
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Quote:
Originally Posted by bamxj View Post
We have heat! Thanks for the help!
May your toes stay warm and cozy!!
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

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Refresh*Connections*Before*Replacing*Components
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Unread 10-30-2013, 03:43 AM   #13
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Quote:
Originally Posted by bamxj View Post
We have heat! Thanks for the help!
Did the magical Heat Fairy wave her magic wand, or, did you remove the valve??
Please specify for future reference...
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