Originally Posted by DonWheeler
I own P/2171. It has a Roush 427SR. I've noticed that the water temperature gauge is no longer working. I'm thinking this should be a relatively easy problem to diagnose, but I'm not certain where to start. Any help would be greatly appreciated.
I also have a couple questions.
Does water travel from the manifold through the metallic connection all the way to the water temp gauge?
Will the radiator fan operate if the water temp gauge is not working? In other words, what causes the fan to operate?
Most every thing about this vehicle is new territory for me; thus the reason for asking some basic questions, and asking for help.
If you have the standard smiths gauge there's not much to diagnose. It's essentially a once piece thing, the long wire-like appendage and bulb actually being a tube full of ether. If the ether leaks out, the gauge is dead.
It can be repaired though, but you'd want to ask yourself if it doesn't make more sense to put in an electronic gauge, although that's a bit of work as well.
It's funny you should mention this because I know someone else with an SPF GT40 who's water temp gauge died in the first 90 miles of use.
There's no water flowing in that tube. The water heats up the ether at the engine's end, and the resulting increase in pressure expands a bourdon tube in the gauge which moves the needle.
The radiator fan has its own thermostat on the upper left corner of the radiator, so it's not affected.