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Unread 10-25-2013, 03:54 AM   #1
FleXJ96
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1998 TJ Wrangler 
 
Join Date: Jul 2011
Location: Chuluota, FL
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Heat out ?

Going for a wheeling /camping trip tomorrow and the heat decided to stop working . What should I trouble check. It's a 98 4.0. Blows air , just not heat . AC is currently bypassed but that shouldn't matter , should it ?

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Unread 10-25-2013, 04:04 AM   #2
bailz812
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2004 LJ Wrangler 
 
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thermostat stuck open or heater core clogged.
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Unread 10-25-2013, 09:43 AM   #3
rubicon17
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pull both lines off going into the heater core, but not at the firewall, do it on the engine side and use a hose to back flush the heater core. is your temp gauge acting normal?
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Unread 10-25-2013, 12:49 PM   #4
FleXJ96
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yes temp is good at 210, hose are hot when running, thinking core might be clogged
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Unread 10-25-2013, 03:52 PM   #5
rubicon17
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yea try back flushing it like i mentioned just pop the hoses off where it connects to the engine and run a water hose through each one you will be surprised all the junk and comes out when the pressure goes the opposite way, it worked great on my xj when i first got it and its been hot ever since.
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Unread 10-25-2013, 04:34 PM   #6
number40Fan
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Are both hoses hot? If so, I bet that you have a blend door that isn't switching to hot. Turn the blower on and change the temp setting from hot to cold. Do you hear a change in air flow?
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Unread 10-25-2013, 06:54 PM   #7
sawoodhick
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if the blend door isn't switching, do I have to replace the heater core or is there another option?
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Unread 10-25-2013, 08:37 PM   #8
Knuckelhead
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Quote:
Originally Posted by sawoodhick View Post
if the blend door isn't switching, do I have to replace the heater core or is there another option?
You can fix/change the blend door actuator and/or the linkage without changing the heater core...
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