This article describes how to handle a coolant smell in the cab of a 311B EXCAVATOR 2LS.
CAT Comm Adapter 3 478-0235 Diagnostics for Caterpillar
Possible Cause 1
There is a leak in the hose or hose clamp.
1. Check the connection between the heating coil and the heater hose.
2. Check the hose for damage.
3. Check to make sure the hose clamp is tightened to the torque value shown in the dimensional
drawing.
Possible Cause 2
There is a leak in the heating coil.
1. Check the heating coil for obvious cracks or holes in the tubing.
2. Check to make sure the hose clamp is tightened to the correct torque.
Possible Cause3
There is a leak in the water valve.
1. Check the water valve for any damage.
2. Check to make sure the hose clamp is tightened to the correct torque.
3. If the water valve is OK during these two initial tests, refer to Troubleshooting, SENR5664,
"Troubleshooting for Heating and Air Conditioning Control Systems".
