[Vwdiesel] Re: Quantum TD overheating- blocked radiator?

JoErnest at aol.com JoErnest at aol.com
Sat Dec 6 16:29:15 EST 2003

I disconnected the hoses at the back of the head, the 3 hoses at the back of 
the water pump, and at the radiator. I got water to flow clear and fast pretty 
much every which way. 

After I buttoned up the system, the temp. needle stil went above the LED to 
the next dot. The lower radiator hose got hot, but not as hot as the top hose. 
I expected the electric fan to come on soon after the temp rose above the LED, 
but they do use different sensors. 

New thoughts:- flow through radiator is inadequate - too much recirculation 
through block without heat rejection, leading to temp rise in block, indicated 
by temp sensor on block.
Inadequate flow through radiator causes slow rise in radiator temp, fan 
sensor still cool, delayed fan activation and slow rise in lower hose temp. 

Time to reflush the radiator.


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