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Don't Always Believe What Temp You See On The Gauge!!!!
1. A4 was running at a temp of 180-190. (RWC)
2. Rebuilt the entire cooling system including new temp gauge and sending unit. Had excellent water flow out the back of the exhaust manifold.
3. A4 still running at a temp of180-190.
4. Rewired boat and engine.
5. A4 now running at a temp of 140-160. Seems to go through a normal warm up curve.
My theory: (Somebody please comment on this) Excess reisistance, I think it was in the ground circuit, was causing the gauge to read to read higher than the actual temp.
It is easy to check wiring with a jumper wire and an ohm meter. (This is how I found that the wiring had a problem)
Further proof would be to run with the jumper wire(s) in place and see if the gauge readings change.
Last edited by JOHN COOKSON; 07-28-2010 at 05:33 PM.
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