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Rockridge 4WD IS Taking Zone Offroad Suspension Lift Kits ZONE 4.25" combo lift for TJ available at Rockridge4wG2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ Ch

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Unread 12-04-2002, 08:55 AM   #1
twmattox
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Join Date: Mar 2002
Location: Indianapolis
Posts: 1,293
brrrrr

Well, I have tried to upgrade my heater...

Did the blower motor upgrade and fan upgrade (blows like a hurricaine).

New thermostat (asked the parts guy for one that will let the engine run a little hotter and keep me warmer).

Adjusted the vent flap (by the passenger foot).

Flushed and refilled the radiator.

I travel highway speeds mostly (65-70 mph), and am wondering if I am overcooling my engine, the temp guage barely registers. I have an '84 CJ-7 with the AMC 150 engine. I have a less than perfect body that is moderately drafty in these conditions, and the air that comes out of the handler is warm (at best).

I remember that with an older car of mine, we would restrict flow to the radiator in the winter. Anyone else have this problem? Where should the temp guage register? What temp is this (in degrees)? How do I find out an actual degree for what temp I am running?

I know it is a lot, thanks...

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Unread 12-04-2002, 09:05 AM   #2
rustyCJ
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Join Date: Sep 2002
Location: IL
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when i first got my jeep i did the carboard infront of the radiator thing, it helped. that was before the evil rust monster had its way with my jeep, now even if i had 350* air coming outta my vents, it still wouldnt get warm. driving at highway speeds with a 4banger with something infront of the radiator might be a lil dangerous, if you do it keep an eye on the temp gauge.
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Unread 12-04-2002, 05:19 PM   #3
werewolf7111
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Join Date: Sep 2002
Location: nc
Posts: 46
I Know exactly what youre going thru. ( when I was attached to Ft Lewis and made trips to Alaska, i learned all about heating a CJ)

>>>>>and am wondering if I am overcooling my engine,

first, relax- its IMPOSSIBLE to "overcool" an engine ( if you ever do manage to do it- email me and give me about 90 days to publish it and we will be the richest people in the galaxy)- the heat generated by an IC engine comes from the combustion and friction of the moving parts- the water circulating acts as a heat exchanger and 'wicks' heat from the engine

>>>>>>the temp guage barely registers

this is most likely a bad gauge, bad sending unit or weak connection- the ONLY way to be certain of the temp is to put a validated thermal probe in the radiator and record readings from the coolant, then do the same for the engine. ( thats how cooling coeffecients are calculated)

>>>>>Where should the temp guage register?

on "paper'- the "ideal" temp of any machine is to operate at 100 F above AMBIENT with a absolute MAX of 250 F ( beyond that, nasty things happen to tempering etc)- a good temp is between 170 and 225 ( this is a broad range and thats about the extreme upper limit)

here are probable causes of your condition( any or all may apply)

1)possible restriction of flow to the core
2) wicking of heat from the lines( anything uninsulated looses heat)
3) the body itself acting as a heat sink( lack of insulation)
4) introduction of cool air constantly
5) lack of circulating air in the crew compartment( creating an air dam situation)

solution- the laws of physics cant be changed so the fix is to eliminate the above- here are some things ive done which make a jeep as warm as a car

1) put pipe insulation on the heater hoses
2) go on a seek and destroy mission for air entrances
3) modify and put the LARGEST core you can find in there
4) undercoat the tub
5) put insulation and carpet inside
6) install 2 air returns in the vehicle near the rear( I have done PVC pipe with a suction manifold and 1 with 2 vents/blowers to outside)- that creates air movement to rear

Hope that helps

Joe MSME PE
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Unread 12-04-2002, 06:24 PM   #4
Mud Dobber
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Join Date: Nov 2002
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Gee is this a real problem, cuz where I live it's winter and I'm still driving with the door off. Sorry, guess I was feeling a bit smug. I'll pay for it when summer comes back.

Mud
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Unread 12-04-2002, 07:26 PM   #5
werewolf7111
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lol beauty ( and warmth) is in the eye of the beholder
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Unread 12-05-2002, 01:30 AM   #6
Jeep Daddy
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Join Date: Jan 2002
Location: Orange County, CA
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Geeze! Mine is hot inside all the time. What's up with that? I have to roll the windows down to cool off.
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Unread 12-05-2002, 07:17 AM   #7
werewolf7111
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one of my CJs is like that too- it will literally run you out of it ( its the8 cyl)
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Unread 12-05-2002, 04:16 PM   #8
twmattox
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Ok, my doors are on, but someone earlier mentioned a top. What's a top? I though Jeeps ran open...

I think I got it figured out. The parts guy told me he sold me a 195 degree thermostat, and it is stamped at 160. Put the new one in and I am fine now.

Thanks all.......
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