Replaced temp gauge sender stay tuned

[Alfisto Steve]

My 94 4.0L V6 has been playing the coffee pot percolator trick with coolant and spilling its guts out coolant tank after shut down. Laser temp gun testing indicates engine op temps in ball park but needle on gauge has always done a low normal reading ever since I bought truck from my bud way back in 04.

Pressure test of radiator caps shows cap good to 16 psi.

Summer time temp highs now within reason and I hope I really don't have a leaking flame ring in one of the head gaskets. Some coolant loss as it perks off in coolant tank but radiator coolant level stays in view with cap off once coolant tank empty.

Straight oil in crankcase and none in coolant tank.

New radiator and thermostat installed couple years ago when thermostat stuck closed and split tank on radiator. Ran fine for years after that happened.

Strange animal.

 

[sholzy]

You probably have air trapped in your system. Refill with coolant while your heat selector is set to hot. Allow the t-stat to open and watch for bubbles at the radiator filler neck opening.

 

[Alfisto Steve]

Drove truck today with new gauge sender installed and needle went right up to middle normal on gauge so sender been giving low reading for years.

Weather cooler only 88 today so no coffee pot perking out of radiator cap today after shut down.