Please Help! Upper Rad Hose Hot, Lower is Cold?? -
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post #1 of 2 Old 06-29-2004, 11:34 PM Thread Starter
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Please Help! Upper Rad Hose Hot, Lower is Cold??

2000 Electric Fan blew up and sheared the radiator.

I got a fan motor and radiator from a local parts dealer. Replaced them tonight.

Took the Jeep put for a spin and it quickly overheated. As if there was no cap on the radiator.

Got it home and checked the hoses. Upper is hot as hell and the lower was barely warm. Ok, I think radiator is clogged. I took the upper and lower hoses off and ran a garden hose through the radiator. It flowed clean from the lower connector.

I then connected the hoses again and took it for a spin, the same thing quickly happened. And again, I could hold the lower hose with no discomfort.

So obviously, no coolant is getting to the engine, correct?

I replaced the thermostat a few weeks ago when this process began.

I am concerned that it is the head gasket. Any way to check that?

I am at a loss, and any help is greatly appreciated.


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post #2 of 2 Old 06-30-2004, 12:16 AM
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Location: Longmont, CO
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Stupid question first: Did you use your original hoses? There's always the possibility you (read: I) would have put them on backwards. Also, be sure the drivebelt is routed the right way if you took it off to do the work. It is possible (but tricky!) to route it so the pump's in reverse. I don't think this is your problem though.

Now that that's done, I'd suggest checking out your water pump as your next step. It sounds like you may not be getting enough flow. I suppose you could stick the intake (bottom) hose into a big ol' tub of water and see if it sucks it up and shoots it out the output (top) hose or not. Perhaps when the fan went out and sheared your radiator, it let the pump run dry and damage the internal fins on you.

The only ways I know to check the head without pulling it is to check your oil dipstick for water in the oil or check for bubbles in the radiator for bubbles or oil(which probably won't work as I'm again guessing you're suffering from low flow).


Last edited by Dalmask; 06-30-2004 at 12:25 AM.
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