Thread: I need some ideas on 350 S/B "Over Heating"

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Originally Posted by John Palmer

My other "related problem" is a VDO water temperature gauge that has worked erratically since it was new two years ago. It stays at 180/200 degrees then quickly shoots up to 250 degrees and falls back to 180/200 for awhile and then repeats its cycle. The VDO gauge and sender were checked by a well known gauge shop and both "tested" fine. I have rerouted my wiring to avoid electrical interferance but nothing has helped this problem.

I don't think you've got a guage problem and possibly not an overheating problem. It sounds like your T-stat is doing almost what it is supposed to do, but it might be sticking a little. With the guage movement, you're seeing the T-stat opening and closing. I'm thinking that you might just have too good a cooling system. Making the thermostat close and restrict water flow far more often than it should. Does it mostly stay at 180, or at the higher 200? Does it run cooler than 180, especially after spiking?

I don't know about the gurgling sound. Maybe you've got air somewhere in there that shouldn't be there.