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Unread 08-24-2010, 06:50 PM   #1
chilipepperjeep
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1998 TJ Wrangler 
 
Join Date: Aug 2010
Location: Utah
Posts: 25
Heater shut-off valve

All of my wheeling is done in the desert where 100+ temps are common in the summer. My wife likes to go with me, but draws the line at no top or AC in those kinds of temps. So in the interest of not going by myself its hard top on, AC blasting. (truth be told I'm not very fond of top off either ) On our last 100+ degree outing the HVAC system was acting up. In the process of trying to figure out why the heat wouldn't shut off and the AC wouldn't blow through the vents I found that the heater control only adjusts the air flow over the heater core. For some reason I thought there would be a valve on the heater supply line that controlled the flow. I'm sure I'm dating myself and its been done for decades, but I was surprised.

Is there any reason not to put a cut of valve on the heater supply line? The stock AC is already on the edge of being totally inadequate it would seem keeping the heater core cold would be of some help.

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Unread 08-24-2010, 07:03 PM   #2
chris142
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2002 TJ Wrangler 
 
Join Date: Jul 2010
Location: Apple Valley,Ca
Posts: 2,692
Quote:
Originally Posted by chilipepperjeep View Post

Is there any reason not to put a cut of valve on the heater supply line? The stock AC is already on the edge of being totally inadequate it would seem keeping the heater core cold would be of some help.
Most engines use a bypass hose or are cast with a bypass hole. This bypass allows a small amount of coolant to circulate which keeps the engine a uniform temp. W/o the bypass you will get hot spots.

Unfortunatly the 2.5 and 4.0 do not use a bypass hose or a cast hole. They use the heater hoses and heater core as the coolant bypass. Putting a valve in the heater hose would shut off the bypass and may cause damage.
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Unread 08-24-2010, 07:08 PM   #3
Bills03tj
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1992 XJ Cherokee 
 
Join Date: Aug 2010
Location: Mauldin SC
Posts: 60
It should be possible to put a heater control valve off of a Ranger in the heater hoses. It allows bypass flow. Ford sets it up to bypass the heater core when it's on max ac. All you'd have to do is tee into the recirc door vac line and run a line to the valve.
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Unread 08-24-2010, 07:11 PM   #4
chris142
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2002 TJ Wrangler 
 
Join Date: Jul 2010
Location: Apple Valley,Ca
Posts: 2,692
The early XJ's used the same type of heater valve. With the heater off the coolant went to the valve then back to the engine.
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ac , a/c , heater , vent , shut off , tj , wrangler
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