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Old 01-18-2020, 01:25 PM
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Heater problem

New to this forum. I inherited my dad's 1973 jeep and the heater has never been good in it. We have had multiple people look at it including me and I can't figure it out. We live in Montana and would really like to either fix the heater or upgrade. Any help would be much appreciated

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Old 01-18-2020, 02:31 PM   #2

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Old 01-18-2020, 02:43 PM   #3
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I'd look into the Mojave heater. No experience with them however. Also, seat heaters are worth a thought.
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Old 01-18-2020, 09:43 PM   #4

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Welcome to the Forum dntroberts,

I had a CJ7 with a V8 and the heat was almost non-existent.
I'd flush the cooling system with a chemical radiator flush, install a new 195* thermostat, new anti-freeze and make sure all the controls work like they should.
A hard top will hold the heat better than a soft top. If you don't have rear seat passengers, a windbreaker or windjammer from Quadratec will make the drivers area smaller and easier to heat.

The usual diagnostics apply too. Check the heater hose temps with a laser thermometer and check the temp of the heat coming out of the heater vent.

Sig220 suggests a Mojave heater and electric seat heaters. That's something to consider if you can't get the heat/defrost you need.

Good Luck, L.M.
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Old 02-10-2020, 06:54 PM   #5
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I have a 1981 CJ7 with a 304 V8. I have a 160 degree therm in it and honestly it will not get hot enough. It wonít go over 160 degrees which I guess is good. But still. On the gulf coast it is only cold enough about 2 months out of the year. BUT - I am about to go to a lower degree therm so it will open up sooner and give some heat. Have no experience with the Mojave heaters but it could be an option. My old CJ5 with a 258 straight 6 and the 160 degree thermostat would put out some serious heat. Go figure !!!
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