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Old 12-27-2009, 04:49 PM   #1
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Unhappy 87 jeep wrangler heat issues.

I just recently replaced my heater core which did solve the heat problem...but the heat is still not blowing out as hot as i think it should be. It feels warm but isn't even enough for the car to heat up. When i bought the jeep it had no heat so im not sure if something else might be wrong with it or if maybe thats just as warm as the heat gets..Any ideas? It feels like its blowing out about 50-60 degrees..

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Old 12-27-2009, 05:03 PM   #2
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I can't say I know what the problem is, but it def should be coming out hot with a new heater core in there. Is the engine getting up to normal operating temp?

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Old 12-27-2009, 05:08 PM   #3
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The engine is at operating temp. If anything it might be running a lil to hot. My uncle who is a mechanic told me it is probably the thermostat, which is kind of what i thought it might be but didnt wanna waste the time and money to replace.
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Old 12-27-2009, 05:10 PM   #4
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That is probably the cheapest place to start, not for nothin'....
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Old 12-27-2009, 05:21 PM   #5
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alright, time to run to autozone, thanks man.
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Old 12-28-2009, 08:29 PM   #6
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I would bet your heater will work after you replace the stat
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Old 12-29-2009, 02:32 PM   #7
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If the stat dont fix it check the blend door if it not closeing it wont get hot!!
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Old 12-29-2009, 03:18 PM   #8
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what does the temp read usuallly if its not as 210 its the stat other wise its that door
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Old 12-30-2009, 07:30 PM   #9
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My Wrangler 4-banger runs really cold blooded. Even in hot weather; it barely gets to 210 degrees. Try a changing the thermostat for a hotter one. Also, in really cold weather, I block off about 2/3 of the radiator with a piece of cardboard, which bring the coolant gauge up to about 1/2 way and gives me some decent heat. Hey, it's a Jeep. If you want too much comfort, you should be driving a Toyota.
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Old 12-30-2009, 08:10 PM   #10
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Well I took my a/c therm. with me this morning to see what the air in my 87 4.2 came out of the defrost at and with my engine temp at 180-190 the air stayed at 70-72 at the defrost vents. the outside temp this morning was 22 and light snow.
and it makes my soft top comfortable but not hot ..lol
it warmed up to 45 today and the vent air was still at 72 and i had to turn it off it was so hot in my jeep. just thought maybe this info might help you some how

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