Overheating problem 5KT - 1981, type 43

[Kneale Brownson]

How old is the water pump?   I had one go on a 4kq way before the belt
replacement was due, but someone else had done that belt, and I don't know
what the circumstance was regarding the pump.  I don't recall an overheat
situation before the pump failed, however.  Our pump started leaking past
the shaft bearing/seal.  



At 10:52 AM 9/23/2006 -0700, Jim Jordan wrote:
>Hi,
>
>I've exhausted all alternatives open to me short of getting a newer car
>which I'm investigating.
>
>My car started overheating some months ago, not badly, just some.  At first,
>I linked it to the coolant temperature gauge, for I had removed the
>instrument cluster to make some bulbs work and thought I may have disturbed
>a connector contact, etc.  Several reworks and rechecks could find no
>problems.
>
>I tested the coolant temp gauge by connecting a 60 ohm resistor and a 450
>ohm resistor in series with the sensor wire to ground, simulating the VW
>tester recommended by the Bentley.  Gauge reads properly with each
>installed.  I changed the TCA700Y voltage reference device to a known good
>one.
>
>I used a digital thermocouple pressed against the head next to the temp
>sensor and measured the outside surface temp to be ~210 F before replacing
>the radiator with a cleaned one.
>
>I've changed the thermostat, fan switch(3X), temp sensor(3X), most of the
>hoses(irrelevant), installed a freshly leak tested, boiled out, rodded out
>radiator(a pita), changed the coolant at least 3 times, used a cooling
>system cleaner followed by flush and renewed coolant.
>
>Most of the cowling is still good and in place although patched with
>flashing and pop rivets.
>
>The temp gauge still reads high although the engine runs fine albeit at
>higher temperature, maybe.  Oil is relatively fresh, topped off, and oil
>temperature reads in normal range.
>
>Could the water pump fail while the timing belt is still operating properly?
>
>
>Any other ideas that come to mind that might solve this problem?
>
>Thanks in advance.
>
>Cheers!
>
>Jim Jordan
>
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