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post #1 of (permalink) Old 05-07-2007, 06:08 PM Thread Starter
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Need new heat

Has anybody replaced the heat and defrost unit completely? I was thinking about a total electric units? any help would be great David
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post #2 of (permalink) Old 05-07-2007, 06:51 PM
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Doesn't seem like a good idea to me - take engine power, turn it into electricity, turn that into chemical energy in the battery, turn it back into electrical energy and turn that into heat? When the engine has more heat than it can use?

It does have advantages for the defroster, if you get the windshield with the embedded electrical film, because it creates more or less even heat all over the windshield, but still . . .

It might be worth it if you could get rid of that big heater box, core and all the ducts under the dash, but if all really do is swap the heater core and hoses for a resistance grid and wiring, where's the advantage?

EVERYTHING's easy for the guy who doesn't have to do it.
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post #3 of (permalink) Old 05-07-2007, 07:21 PM
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Here is an old thread on the subject. Try a search for heater motor upgrade. There is also a better diverter that puts the heat on your feet if that helps. Carpet helps too. In addition, I run a hard halftop in the winter. I get hot with the fan on medium in sub freezing temps.

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post #4 of (permalink) Old 05-07-2007, 07:36 PM
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What i did was upgrade to a Fullsize 85 Blazer blower motor.
Wow that will push some air!
Then I made it so the system heats the air from the cab. Why would you heat cold air? No with the top on in the winter i at times need to shut it off. I can make it to warm in the cab.

Even the cold nights with no top or doors i can feel the output.

Note: the diverter that Taz is talking about you dont want after you do what i did. Not only do your feet melt but I found i could make the Cab much warmer with it off then with it...

88 YJ SOA2.5" 2"BDY Locked F/R Chevy 4.3 NVG241OR 4.56's 36x12.50
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post #5 of (permalink) Old 05-07-2007, 08:10 PM
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How much heat do you need? I welded up the rust holes in the tub, refurbished the heater box, installed the GM Blower motor upgrade, and re-configured the underdash AC to be a heater. I can (and have) kept the Jeep windshileld frost free and the interior warm enough for short-sleeve shirts in -40F weather. Everything's old-school, easily fixed if it fails and doesn't rob any more power from the engine than a stock heater assembly. What more could you ask for?
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post #6 of (permalink) Old 05-08-2007, 12:05 AM
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The 12 volt electric heaters are completely useless. The make Very very little heat. Others suggestions are very good. I did the Chevy blower motor swap and was very impressed. Best $22.95 I spent on the Jeep. If you really want the instant heat of Electric, look into the second unregulated alternator systems used in some 80's Caddy's.


I will start using Metric only when the duodecimal system is adopted!!
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post #7 of (permalink) Old 05-08-2007, 01:52 PM
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I'd recommend having a good heater core, an upgraded blower motor, and an auxillary heater that plumbs into the existing fluid with Y connectors for more interior heat.
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