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Old February 1st, 2011, 03:02 PM   #1
302flexj
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Default 94 explorer 4.0l no heat

Hey guys well i have a 94 explorer with the 4.0 and the heat sucks, the temp gauge will go up and down while driving. It has new rad, water pump and tstat so those are ruled out. it also seems to be using coolant but it doesn't blow any white smoke or nothing and its not leaking. When the temp gauge goes up i get heat but when it goes down no heat got any ideas?
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Old February 1st, 2011, 03:06 PM   #2
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Heater cores are cheap and super easy to change on these.
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Old February 1st, 2011, 03:26 PM   #3
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yea i dont know if that is it because of the way the temp gauge flucuates so much, it gets good heat when its showing warm. even tried the ole cardboard trick with no luck.
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Old February 2nd, 2011, 09:26 AM   #4
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I am having a similar problem with mine although it doesn't fluctuate enough to lose heat but doesn't get as hot as it should either. Over on the ex forums the responses haven been either water pump or heater core with more saying heater core. I read a few threads with your exact problems that ended up being a heater core. Since you're having similar issues and I've changed the thermostat and rad cap and the rad is fairly new I will be changing the heater core first as its the easier of the 2.
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Old February 2nd, 2011, 02:52 PM   #5
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Possible head gasket or crack somewhere??
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Old February 2nd, 2011, 03:27 PM   #6
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Sounds like an air pocket to me.
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Old February 5th, 2011, 11:57 AM   #7
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x2 on the air pocket. If you set still and rev it in park for a minute do the vents blow hot? If it does it's probobly a air pocket, but could still be a partially plugged heater core. If it keeps drinking coolant you might want to check out the lower intake gaskets...or maybe head gaskets/cracked head.
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Old February 11th, 2011, 08:21 AM   #8
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I've had similar issues with my 94 explorer. Chances are with the fluctuating temp gauge you have an air pocket in your cooling system somewhere. Also on the passenger side of the vehicle by the air box there is a heater control valve, very common for those to fail and leak coolant while under pressure. It is also very common for our heads to crack and cause fluctuating engine temperatures as it will over pressurize the cooling system. Start with the easy and cheap and go from there.
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Old February 19th, 2011, 05:48 PM   #9
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I would say it sounds like you prolly have a cracked head like he said it is a very common prob i have had the same issue on a few trucks and they did the same thing that you discribed
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Old February 19th, 2011, 07:22 PM   #10
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i just changed my heater core because my temp would fluctuate and the heat wasnt stellar. temp would go from normal upto the end of normal range and back. after heater core swap the temp guage hardly moves now and the heat is better. the heater core was just about full of black goop. also jsut because you bought a new tstat doesnt mean its any good.
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Old February 19th, 2011, 10:14 PM   #11
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Quote:
Originally Posted by rangerman1995 View Post
I would say it sounds like you prolly have a cracked head like he said it is a very common prob i have had the same issue on a few trucks and they did the same thing that you discribed
I've never seen a 4.0 with a cracked head. 2.9, yes -hell yes, but a 4.0?? Wouldn't call it common..castings are far more robust.

However, if it's using coolant, it's leaking it - either externally or into the cylinders. This engine doesn't have a wet intake, so it'd be a head gasket issue if it's leaking internally - there's a test you can do to see if the coolant is contaminated with combustion gases, which would confirm a head gasket issue.

If there's an air pocket, which it sounds like to me, jack the front of the truck up when you're bleeding the coolant system. It'll cause the air to move into the radiator and eventually out of the system.

Last edited by chris1044; February 19th, 2011 at 10:20 PM.
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