
Image is for illustration purposes only. Actual part may vary.
730411
This is a coolant level sensor, also sold under the OEM number Q21-6030-004, that monitors the fluid level in the surge tank or radiator. It screws into a threaded boss and uses an internal float to detect when coolant drops too low, triggering a dash warning light. The sensor is commonly replaced when the old one fails, causing a false low-coolant alarm or failing to alert you to actual low coolant. Made by PAI Industries, it serves as a direct plug-and-play replacement for several Peterbilt and Kenworth models.
Verify your surge tank or radiator boss thread (1/4"-18 NPT) and the existing OE part number on the sensor flat before ordering. Other Paccar-platform chassis using the Q21-6030 surge-tank sensor may also be compatible.
Part Number: 730411
COOLANT LEVEL SENSOR /PAI
Vendor: PAI Industries
Dealer: KP Services Crossville
Compatibility, alternatives, and more