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Old 01-06-2011, 08:15 AM   #1
Join Date: Jan 2011
Posts: 5
Question Engine at proper temp but radiator cold

Engine temp indicator shows running at proper temp, but radiator cool to the touch. And no heat from heater.
When first noticed problem, I discovered radiator low on anti freeze, it was below top of core, Added maybe 1/4 gallon, then it was full. And then I filled reservore.
Ran for 20 + minutes, temp of radiator felt warm at best and cap still cool ,
When cap removed antifreeze is cold, heater not putting out much heat,
Heater finally started putting out a little heat. (warm not hot air).

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Old 01-06-2011, 08:38 AM   #2
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Location: Southern PA
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It sounds like your thermostat is stuck open. Try putting a new one in that should take care of it.

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Old 01-06-2011, 08:41 AM   #3
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What does the engine temp gauge read?
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.
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Old 01-06-2011, 09:12 AM   #4
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thermostat needs replaced.
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Old 01-06-2011, 09:16 AM   #5
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Location: NW Arkansas
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You might also want to try flushing your heater core. I had this problem a few weeks ago.
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Old 01-07-2011, 02:49 AM   #6
Join Date: Jan 2011
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Thank you all, I will do both the thermostat and the heater core.

Does anyone know anything about bleeding the cooling system.

Or about a Fail Safe ? for the cooling system.
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Old 01-07-2011, 06:15 AM   #7

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Location: Canada, Eh?
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Do not under any circumstances use a Fail Safe thermostat they are junk. It will end up locking in the open position the first time your engine gets up to operating temp, then you'll have to do it all over again, trust me they suck.

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