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Old 04-17-2013, 10:48 PM   #1
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Jeeps running hot-what could it be?

I have a 97 Jeep Wrangler, I recently replaced the radiator. i had coolant leaking like crazy and it would overheat, so I found a leak in the top hose that comes from the water pump into the radiator. Rather than just replacing that hose, i replaced all of them last weekend. It was running great for a few days but then I was driving a few hours yesterday and I noticed the temperature was running over 210, which it never did. Soon, it went up to the red, so I pulled over and checked the reservoir. Still had coolant in there and it wasn't smoking or anything. I turned the heat on high and the temperature went back down. I realized if the temp rises and I turn on the heat, the temp goes back down. My heater hasn't been working correctly for the past few months either. It never gets hot, only warm. Any ideas on what the issue is? I was guessing the thermostat. But what about the heater? Could it be the heater core?
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Old 04-18-2013, 12:28 AM   #2
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Id change the thermostat, they are rather inexpensive. As for your heater issue you should flush the heater core. There are a few threads here on doing it, and also on youtube.

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Old 04-18-2013, 12:32 AM   #3
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Look at that fan clutch thing that was the issue with mine. And flush the core also the problem with mine. Drove me nuts. But... All better
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Old 04-18-2013, 12:35 AM   #4
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Thanks to both of you!
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Old 04-18-2013, 12:39 AM   #5
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Thanks to both of you!
Lol the fan when you spin it is NOT supposed to spin freely shouldn't even go around once. I assumed since it was spinning when on it was working I was wrong. Lol. 98 tj here. Just give it a push if it spins several time you need a new one. $40 auto zone. Install? A friend did mine for a very low price.
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Old 04-18-2013, 12:57 AM   #6
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I do all the work on my jeep myself, unless it's the computer or some crazy wiring
Fan was fine the other day. I pulled the shroud off when I changed the hoses and it seemed fine then, unless something happened between then and now. I'll have to double-check it
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Old 04-18-2013, 07:09 AM   #7
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Did you completely flush the system when you replaced the radiator?
Sounds like the stat is either gunked up or needs replacing. Sometimes just cleaning it will help, you might as well flush the system if you didn't already otherwise a clean or new thermostat will end up in the same condition in no time.
I blew mine out a couple weeks back (literally blew it out). Unhook one of the core hoses (top) and hook up a hose pipe with a funnel. Unhook the bottom hose from the Rad, let it drain, then blow down the funnel with all your might..... you wouldn't believe the crap that comes out doing that, crap that even a hot water flush didn't shift. My TJ heater now works a treat, and no over heating
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Old 04-18-2013, 07:43 AM   #8
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You may have air in the cooling system. If you get an air bubble at the thermostat it won't work properly.
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Old 04-18-2013, 08:02 AM   #9
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^ yes. I'd replace the thermostat but, make sure the air is out.

We usually run them cold, with the radiator cap off. Then wait for the thermostat to open and you'll see the fluid start to circulate in there. Possibly go down... When that happens, top it off with coolent then cap it.
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Old 04-18-2013, 11:25 AM   #10
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I did flush the system, left the radiator cap open, turned the heat on high and let the new coolant run through the system. I was reading in the manual that if its getting hot/overheating and the top hose is hot, then the thermostat is opening. Which the hose was hot. Could that still be it?

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