you checked and cleaned the contacts on the op sending unit? on the heat, the usual drill: clean radiator fins, check thermostat, flush cooling system, change water pump, change radiator, in order of cost.

a little more info on the way it is getting warm might help us zero in.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.