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Old 02-25-2012, 10:01 PM   #1
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Help heater blowing cold air

Hello God bless I just bought a 93 yj and I need a little help the heater turns on but it blows out cold air what should I do?

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Old 02-25-2012, 10:08 PM   #2
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Your thermostat is probably stuck, replace it.

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Old 02-25-2012, 10:30 PM   #3
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Had the same problem with my son's YJ. We replaced the thermostat and it helped some. We then flushed the heater core and it got much better. Check your temp gauge, It should run just under 200 deg once you are up temperature, If not, the definitely change your thermostat. Make sure you get a 195 deg. thermostat. If this does not alleviate the problem, once your engine is cool, take your heater hoses loose and flush with water. Also make sure you have plenty of antifreeze.
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Old 02-26-2012, 01:48 PM   #4
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do thermo first if not heater core
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Old 02-26-2012, 04:20 PM   #5
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back flush the heater core
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Old 02-26-2012, 05:11 PM   #6
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do some checking first

Check the temperature of the heater hoses when the engine is hot to see if the water is flowing through the heater core. If it is and the hoses are hot at the firewall, then the problem is likely under the dash with the controls.

Once you have determined if it is coolant or air you can proceed with actually finding out what is wrong and fixing that.

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