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  #1  
Old July 21st, 2019, 10:23
Dragonlich1961 Dragonlich1961 is offline
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having overheating issues. 94

my 94 4.0 aw4 is having bad overheating issues.
idles with hood up and ac on 12 220-230. driving around the block with no real stopping and the guages is close to red. i know these things run hot.
I've installed a mishimoto rad, b&m trans and p/s coolers, Removed my winch to promote air flow, high flow tstat housing and high flow water pump. all over a year ago. ( all but winch). and it cooled fine little warm but it's a jeep xj. I simply can not run ac in anything over 75 degrees. and even at 90 with no ac it runs 215-230. not good.
Onlything i can find is i have no noticable coolant leak yet i do have to add alittle bit every now and again. Am i right to suspect a head gasket?
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Old July 21st, 2019, 19:53
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Patrick S. Patrick S. is offline
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Re: having overheating issues. 94

Hi,

Some more basic things I can think of first would be:

Did you change your fan clutch? Is your electric fan working? Did you test or change your radiator cap?

Does it run hot at highway speeds too?

Patrick
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Old July 21st, 2019, 22:41
lawsoncl lawsoncl is offline
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Re: having overheating issues. 94

Did you see this other thread where the OP believes his problem was caused by the high flow tstat housing and high flow pump? https://naxja.org/forum/showthread.php?t=1155108


A bad O2 sensor can make the engine run lean and hot too. Mileage seem normal?
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Old July 26th, 2019, 10:07
Dragonlich1961 Dragonlich1961 is offline
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Re: having overheating issues. 94

Fan clutch and rad cap about one year old. Fan clutch when warm has drag and stops spinning shortly after you remove your hand. So it's good.
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Old July 26th, 2019, 17:58
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Patrick S. Patrick S. is offline
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Re: having overheating issues. 94

Does it run hot on highway too?

How much coolant do you add after x amount of miles?

Maybe time for at least a compression test or leak down test.
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Old July 26th, 2019, 21:46
Dragonlich1961 Dragonlich1961 is offline
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Re: having overheating issues. 94

Highway driving is bad. 70. Is Max any more and it will run hot. Coolant is maybe a resivour full every 500-800. Not been paying to much attention.
Before the new radiator went it I flushed the block and heater core. Then did water pump and tsat after, so the block it flushed as much as possible. I know these rigs suck at maintaining engine temp. But I'm not asking it to do anything extrodinary here.
Rig is a 94 168k aw4 bout 5 iinchs lift with 33 4.56. stand alone b&m cooler stacked plate style,. Biggest that will fit in front of mechanical fan. With same cooler for ps. Radiator trans cooler not plumbed.
Ac works great.
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Old July 26th, 2019, 22:32
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Re: having overheating issues. 94

Not normal for it to be overheating at highway speeds. My XJ only starts to get hot on uphill climbs but that's fairly normal as it cools back down rapidly.

That's a lot of coolant loss.

Unless you have a easier leak you haven't found such as a hose, defective water pump (underside from weep hole), freeze plug, thermostat housing (underside), heater core (coolant smell inside cabin), etc it sure sounds like it could be cylinder head related.

Have a good look around after 10 min of shutting down. If you can't find any leaks you have to do some further testing with the correct tools.
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