bottom of radiator cold, low heat - Jeep Wrangler Forum

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Old 11-30-2012, 10:01 AM
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bottom of radiator cold, low heat

98 wrangler, 4.0, 5 speed, with warm not hot heat. blend door and inside controls all work properly. I flushed the heater core, and hoses, wasn't too bad, a little brown water came out. Next replaced the thermostat with a new 195. Still little heat. Replaced the thermostat with a boiled thermostat that opened, I even boiled the old thermostat, and it opened also. I replaced the radiator cap, and waterpump with the same reverse flow type water pump. Still low heat. I do notice that when the jeep is warm (thermostat open), I see no flow of antifreeze flowing in the top of the radiator, and the bottom of the radiator is cold, and so is the bottom radiator hose. Both heater core hoses are warm, and the upper hose is warm. The Jeep is not overheating and the gauge says just below 200 when it is warmed up. I bought a new radiator and will put that in as a last resort. Any other thoughts on what the problem could be? Thanks for any information.
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Old 11-30-2012, 12:10 PM   #2
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if the thermostat is opening and you have the right pump that is working properly then you should see a flow in the top of the radiator

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Old 11-30-2012, 12:13 PM   #3
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My bet after all this is that your heater core is simply clogged with gunk. Flush it back & forth with a garden hose connected at the ends of its two hoses that connect at the front of the engine. Note the two hoses have very slightly different diameters so be sure to note which location each hose came from as you disconnect them.
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