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Cooling Problem?

T

Trwirth

New member
Need some help/advice because I am getting a very low operating temperature starting at the start of this season and here are the facts:

1989 4.3 L Alpha I V-6

New water impeller/housing last season

with the symptoms first time out I then changed the thermostat

With advice, shorted the sending unit lug to ground on the gauge and got very little movement, so I located a new gauge and changed it out, at the same time I ran a jumper and checked the continuity of the sending unit wire and got 12 volts on the meter.

Pulled the 2 hoses on the thermostat housing and cleaned and put back (the shaft with the 2 nylon balls and springs) .

Now when I should be at normal operating temperature the gauge does come up but barely to the first line. It does stay there at a constant temperature.

Only thing left is the sending unit itself which I have pulled to see if it had a corrosion (insulating) problem and it was clean.

Any thoughts/ideas/comments would be appreciated.

Thanks,

Tom
 
cheifalen:

not sure what temps you mean. But the lake surface is 71 I am running in, the thermostat is the 140 reccomended.

Gauge? who knows? it only has C on one end and H on the other with 4 line grads in between. When it should be normally at the first line at operating temp (like 1/4 full on a fuel gauge) the needle barely gets past the C for cold, it does move from the rest position but nowhere near where it always would be.
 
There is corrosion inside your wiring. Run a jumper from the sender to the back of the gauge to see if it reads higher. I have cut the wire connector ends off and found blackened copper wire. Scrape the wire strands until bright copper appears and solder the wire to the connector. Use 200-400 grit sand paper and drag the stipped wire through it to clean it.
 
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