98 ZJ still wanting to heat up at idle after going through the cooling system


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Old 09-18-2019, 08:46 PM   #1
1997jeepxj1
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Default 98 ZJ still wanting to heat up at idle after going through the cooling system

New gates hoses water pump and tstat. New spectra radiator. New Hayden fan clutch. Flushed with my hose while the pump and stat was out till clear. Before after about 10-15mins idling on a 9x* day it could get as high as 3/4 of the gauge while at idle. It's much better now however after about 20 mins stuck in a drive thru last night it slowly started to creep up just a bit past 210. It's only an issue sitting still. Even before all the new parts. The Shroud is there all of the weird rubber stuff that goes around it to seal it off is there. My guess is stuff still in the block I was thinking about doing a CLR flush but I've never done one. Any ideas?
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Old 09-18-2019, 09:07 PM   #2
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210 is operating temp. Slightly above that is fine. especially on a 90* day. These engines , assuming it's the 4.0 will run hot. Its a lot of motor. You can try hood vents. or try revving the engine up and see if it cools down. The hayden should be enough to cool it down. Can you hear the fan get louder as the engine heats up? It should sound like a jet when it's fully engaged.
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Old 09-18-2019, 11:07 PM   #3
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5.2l v8
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Old 09-19-2019, 05:47 AM   #4
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Doesn't sound like its overheating anymore to me

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Old 09-19-2019, 11:13 AM   #5
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Not over heating just running on the warm side. I'm betting if I had waited it would have gone up more. I did find some coolant (a small amount) on top of the water outlet so maybe its got a slow/high pressure leak. Or I just made a mess changing hoses and stuff. I have a stant superstat I am going to swap for the gates when I flush it with some motoraid flush
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Old 09-19-2019, 12:46 PM   #6
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How is your fan shroud?
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Old 09-19-2019, 02:45 PM   #7
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Do yo have a radiator funnel? The kits are cheap and making sure you have all the air burped out a piece of cake.
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Old 09-20-2019, 07:43 AM   #8
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fan shroud and all the rubber inserts around it to direct air flow are all fine.

I don't have one of the spill proof funnels but I believe i got all the air out of it.

I did however notice a small amount of coolant collected on top of the tstat housing so either i made a mess putting it back together and didn't notice, or I have a small/high pressure leak right there. I'm going to pull the stat and swap in a good stant superstat and some flush fluid with a back flush kit to flush it again and blow all the water out with air and see if that helps. Just not sure of which flush fluid is the best though I suspect anything i can easily buy in an autoparts will essentially be the same
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Old 09-20-2019, 05:48 PM   #9
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Oem stat from dealer. Or online source.

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  • Up Country Clone Suspension
  • 235/75R15 Cooper ATs
  • 2 inch Recievers front and rear
  • Factory T-Case skid added
  • PowerTrax No Slip in D30
  • WJ Front Seats
  • Motorola PM400 UHF Radio
  • LED lights all around
  • Rear cargo area power outlet for 12v and USB
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