Engine over heating

[Joe Westbrook]

Leaking plastic receiver tank , replaced with steel tank . Left on trip only got 3 miles ran hot again, checked radiator fan and it's not coming on ! All help appreciated, 2001 C 12  Beaver Marquis 42 ft. Joe.

[Rod Ogle]

Joe

  Your rig overheated in just 3 miles?  Our C-12 takes 15-20 minutes to reach normal operating temps.  Suggest you verify that your coolant level is right to start with.  I will send you a PM on my experience with cooling fan operation.

[Larry Fritz]

Joe: This almost sounds like a broken serpentine belt; but, I am not sure what all else is on that belt. The belt is easy to spot even if you have a rear radiator. I had this happen to me with a 5 year old belt and same symptoms.

Larry

[Gerald Farris]

Joe,
Your C 12 only uses the serpentine belt to run the alternator and A/C compressor. Everything else on the engine like the hydraulic fan pump, air compressor, and water pump are direct drive from the engine. Your problem sounds like a low coolant level. If the coolant is low or the thermostat is stuck closed, the wax valve will receive no hot coolant, so it will not activate the fan. You need hot coolant circulating in the cooling system for the fan to engage. 

Gerald

[Dave Atherton]

Joe, fan not coming on with C-12. Information on Fan switch has been posted
on technical information site (Ask Dave page two last entry.)
Dave Atherton Retired Cat Mechanic