Hey folks,
My fire truck (90 FJ62 w/ Carb'ed 3F) has always ran cool according to the gauge, mostly running at, or just slightly above, the C hashmark.
I've replaced the thermostat with a new 88C Aisin unit, and verified that the o-ring is in place properly. I've also replaced the sending unit (New OEM Toyota), believing it was reading low.
The truck still runs extremely cool. After a 30 minute drive on the freeway, the gauge was at the C mark, and the temp sending unit was at 92ohm to ground (~170f). I used some resistors to simulate 200f, 220f and 240f and the gauge operates as expected.
Is it common for these trucks to run so cool?
-Rob
My fire truck (90 FJ62 w/ Carb'ed 3F) has always ran cool according to the gauge, mostly running at, or just slightly above, the C hashmark.
I've replaced the thermostat with a new 88C Aisin unit, and verified that the o-ring is in place properly. I've also replaced the sending unit (New OEM Toyota), believing it was reading low.
The truck still runs extremely cool. After a 30 minute drive on the freeway, the gauge was at the C mark, and the temp sending unit was at 92ohm to ground (~170f). I used some resistors to simulate 200f, 220f and 240f and the gauge operates as expected.
Is it common for these trucks to run so cool?
-Rob