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Old 01-23-2014, 12:00 PM   #1
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May be overheating?

Hey guys so my cj7 recently had a small incident which involved my jeep being at about 220 degrees when I drove it home one night. we chalked this up to having super old coolant in my jeep and the antifreeze wasn't doing its job.

I have a pretty stock chevy 327 and no overflow tank which I've read should be fine. And average running temp is between 190-220 (max).

I have a choke on my jeep that wasn't hooked up and I'm in VT so 0 degree out or colder, so you can imagine what starting it is like. Lots of pumping and revving the engine to 3k so it doesn't stall and die before it is warm.

Now I dumped all the coolant after that night it may have froze and replaced it properly. I drove all the way up to VT on the highway at about 65mph and the temp was between 160-180 which makes sense for the temp at the time (low 20s).

More recently after that drive my temps were between 190-210(maybe a little higher when sitting at a light) but this would vary because the speed limit was about 25 between these stop and go lights.

Now recently and what is worrying me is I have to move my Jeep for parking bans so I park it in a lot not even half a block from where I park.

After going through the process I said earlier to turn my Jeep on I will put it in drive and move it when the thermo says 140 degrees. By the time I park it and look down the thermostat says 220-222 degrees. Once I have stopped and am idling for a second the thermo starts to drop back down somewhat quickly.

Am I just not driving it enough when I am moving it for the engine to cool down from the coolant or do we think something else is wrong here.

Considering I drove 4 hours after the frozen antifreeze issue with no problems I think its safe to assume nothing was damaged and I got very lucky, but maybe I'm wrong.

Please help I can't afford to damage something in an overheat.

I also plan on getting an elec choke conversion kit (have hot air choke in right now)

Maybe overflow tank?

Also have the 327 fan in there with what I assume is the stock CJ7 radiator from a 6cyl and no shroud.

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Old 01-23-2014, 12:01 PM   #2
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Also put a 180 thermostat after that night where the coolant froze. Previous thermo was 195 I believe.

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Old 01-23-2014, 12:17 PM   #3
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I think that when the temp drops back down quickly is when the thermostat is opening..it might be hard to really tell what it's doing until the weather warms up some..when it gets hot it will run some coolant out the overflow.if you have a tank then it can suck that coolant back in as it cools down so you should add one..just keep the radiator checked and refilled until then..
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Old 01-23-2014, 12:25 PM   #4
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So essentially you think I'm just not waiting long enough for the coolant to knock that temp down, it just seems strange 180 thermo drops the temp at 220+ degrees.
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Old 01-23-2014, 12:38 PM   #5
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that's just my guess because that is usually when the temp makes a noticeable drop..a couple of things could account for the 180,220 difference..gauge could be wrong..could be the difference in the temp at the thermostat and at the location of the temp sensor..new thermostat could be sticking even
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Old 01-23-2014, 12:53 PM   #6
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We tested the thermo before we put it i and it fully opened. I have read somewhere that the 180 thermostat doesn't fully open until 195 degrees. Though maybe the coolant is making it stick, but it is brand new.


I suppose further testing would help, maybe idling it to around 195 degrees then driving, or around 180 so the thermostat has already opened before I am driving?

Thanks for your help, I definitely don't want to mess with overheating my engine.

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