[McC_65_91]

i got a similar queston
ive got a 165 thermostat in my truck, watching the temp gauge you can see it open at around 230, then truck runs around 195.
how are the thermostats rated? i would assume theyre rated to open at the temp, ie. my 165 would open at 165 right?
I just think its weird that my thermostat opens so hot, i know its not bad or stuck either because after pulling the motor and rebuilding much of the lower half when i got the truck i had a new 175 in it, thought it wasnt opening b/c it got up so high and i shut it off before it opened thinking it wasnt going open
so i replaced it with a new 165 and was worried again b/c it wasnt opened but then it did around 230. once open the trucks purrs, not too hot, i can touch the block and its never overheated on me.
Is it possible that the temp gauge is wrong? (its an aftermarket PO put in, one on dash doesnt work) could it just be a wrong resistor or something? on a side note, i once left work on a VERY hot day this past summer and before starting the truck it read like 120-130 i think, it was high 90s that day, but id never seen it start not all the way down before after sitting all day (8 hours)so this made me think the gague was wrong. i dont think it would be 30 degrees hotter inside the engine compartment either