[iowa1972jd140]

Mowed for 1 hour and it was 87 out just got done and the hot light came on where do I start. The radiator is clean with fresh coolant and the screen is clean.

 

[mikeduwe]

May need to pull the radiator out and have it hot tanked if the internals are crudded up.

Or it could be a bad sensor itself. I'm sure Chuck will chime in with a section of the owners manual on it.

 

[coalminer16]

Also thermostat and water pump. Thermostat could be stuck shut and water pump impeller could be spinning on the shaft. And the wire for the sensor could have rubbed through making the light turn on if it hits ground (bare metal).

 

[iowa1972jd140]

The light is working I need to check the wp and thermostat

 

[shivelyt]

Daniel,
As Mike mentioned, the sensor could be bad. Mine started acting up a few years ago. The light would come on but it wasn't actually running hot. I checked the temperature of the top of the radiator with an infrared gun to verify.
Tom

 

[iowa1972jd140]

At what temp should the light come on

 

[chuckv]

Dan,

From the CTM3 engine manual there is this range stated as to when the switch much operate:
Coolant Temperature Sensor Continuity . . . . . . . . . . . 107-113° C (225-235° F)

Chuck

 

[budfan4]

Have a 330 that was doing the same thing, took the pump off and removed the impeller cover and most of the vanes were corroded away. It was pumping but not enough under pressure.