Originally Posted By: Dorian
Diesels have very high thermal efficiency. I'm sure that the engine is designed to stay cool under extreme loads, so an idling engine is probably nothing for the cooling system in that truck. Also, with 12 Qts. of oil it will take quite a bit of work to make that engine get to a temperature that requires a cooling fan. For what it is worth, I have never heard the cooling fans on the 14.5 Camry. It takes an awful lot for the cooling fans to come on in the 99 Camry and the Prizm.
On your 99 Camry, maybe the thermostat is opening too early?
On my 2000, if I idle in a drive thru for more than a minute the fans will kick on for about 20 seconds.
I'm also in Arizona. But it does it when it's cool out too.