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Unread 12-05-2008, 01:30 PM   #1
lpdeluxe
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1995 ZJ 
 
Join Date: Dec 2008
Location: Sioux Falls
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95 4.0 Engine won't heat up

My engine temp won't get above 120 deg, barely above 100 today when the outside temp is 15 above. I noticed that when I start the engine, the cooling fan comes on immediately at high speed and stays on. Turns off when I shut off the ignition. A/C isn't on. Defrost isn't on. It starts and runs OK. It's getting really cold, so any direction is appreciated. I've read about temp switches and relays under the front fender, but what should I try first?

Thanks!

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Unread 12-05-2008, 01:45 PM   #2
iluvtruenos
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Thermostat.

Or, since the fan is turning on, possibly both thermostat and not enough coolant.
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Unread 12-05-2008, 01:51 PM   #3
-Joe-
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95 4.0 has a clutch fan.. It always spins.

Its a mechanical type fan, no relay or electronics involved in its operation.
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242TC - Extreme Engineering 2" Front Lift/1.75" Rear Lift - ES9000 Shocks + JKS BPEs
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Unread 12-05-2008, 01:59 PM   #4
iluvtruenos
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Ahh, then definately stuck open thermostat.

If you replace it (and not a mechanic) make sure you put it in properly. Otherwise you might have an engine that overheats instead of underheating.

Good luck! Always come back here, I seem to log on at random hours now, so if you need any help PM me.
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Unread 12-05-2008, 02:08 PM   #5
micifus
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Replace the thermostat and see if you can spin the fan by hand.
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Unread 12-05-2008, 02:09 PM   #6
lpdeluxe
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That bit about the mechanical fan is the info I think I've been searching for. I will try the thermostat tonight! Thank you so far to those who've responded.
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Unread 12-05-2008, 02:10 PM   #7
iluvtruenos
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Well, he shouldn't be able to spin the fan by hand.

It's locked down until 3k (?) rpm or so, then freewheels when the engine revs so high that it threatens to tear the fan apart.
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Unread 12-10-2014, 07:56 PM   #8
kenv1
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93 Cherokee,has new thermostat,radiator,good coolant, still the engine stays around 10 and barely any heat.anyone have ideas
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Unread 12-10-2014, 08:06 PM   #9
kg6mov
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I have an idea, don't dig up 6 year old dead posts!

If you do in fact have a 93 Cherokee (XJ) then you will get much better help over in the XJ section of the forum: http://www.jeepforum.com/forum/f11/

If you have a 93 Grand Cherokee (ZJ) you should give us more info so we can help you.

Actually, in either case you should give us more info. Fill out your jeep profile with as much as you can, engine, trans, trim, axles. We need to know engine for the cooling problem and the rest will probably come in handy later.

Oh, and welcome to the forum!
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