I have a 89 xj w/ 4.0L. I put in new thermostat 3 times, 2 waterpumps,radiator and heater control valve. It overheats after 30 min of idle or if i drive a few miles. it seems the thermostat never opens,cooland is circulated everywhere but i know head gasket good,and components are good,even tested thermostat and it opened at right temp, just not on truck any ideas??
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overheating question
- Thread starter josh89xj
- Start date
tugalo
NAXJA Forum User
- Location
- easley, sc
take out the thermostat and see if it overheats....if so, make sure you didn't put it in backwards...make sure to bleed out all the air from the cooling system.
Badcop
NAXJA Forum User
- Location
- Woods Cross, Utah
Hell I have an 89 also, run a wire from the white wire on the aux fan into the cab, to toggle switch to fuse box.... DUN!
Never overheat again.... The older ones have a tendancy to lose the use of the elec fan.
Never overheat again.... The older ones have a tendancy to lose the use of the elec fan.
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
A crack sure can, you need to be able to build pressure in the system.josh89xj said:
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
What kind of extreme conditions? Hot or Cooled.churky89 said:
195 is stock.
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
Drill a small hole through it so a little water can flow past it, you sound like you have a air pocket and the hot water is not getting to it.josh89xj said:
Do you still have the stock closed system?
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
It says your in Texas, that's why I ask.churky89 said:
Yeah I'm in Texas,got a 89'XJ...When I first got it (@4 yrs ago)it had the closed system.
Took 2 radiators(Stock for/closed sys)before I swapped to the open system and all the over heating stopped.
Also wired the aux fan direct and have a switch on the dash
Backflush at least once a year,and change hoses and t stat and belt and keep the others for spares
Run a 195 deg t stat yr round and try to avoid any and all traffic tie ups and here in Texas they're constantly working on the freeways...
Took 2 radiators(Stock for/closed sys)before I swapped to the open system and all the over heating stopped.
Also wired the aux fan direct and have a switch on the dash
Backflush at least once a year,and change hoses and t stat and belt and keep the others for spares
Run a 195 deg t stat yr round and try to avoid any and all traffic tie ups and here in Texas they're constantly working on the freeways...
langer1
NAXJA Forum User
- Location
- Mineral City,Ohio
You ask about a crack in the bottle, is there a crack?josh89xj said:
I think I am going to try a co workers suggestion,drilling 2 1/16 th holes in thermostat to help bleed air out so i can get some flow thru. Like i said before its all good w/out the thermostat but when i put it in it wont open..so i think it might just be air,ill post my results tommorow if anyones interested..but if it still no worky not very many other things left to try...