1991 Trail Boss 350L 2x4 HOT light
#1
1991 Trail Boss 350L 2x4 HOT light
Hey all - first post as I am new here. I have been using your other forums so I might as well sign up!
I have a 91 polaris Trail Boss 350L 2x4 that was just purchased. I am now getting a HOT sensor as it is overheating. I filled the antifreeze (may have overfilled it) and took it for a ride. Within 5 minutes the HOT sensor comes on. I burped the antifreeze using the 10mm bolt on the engine but it only spurted out. When the key is turned the fan comes on immediately. Even when it was not running prior.
Any help would be greatly appreciated and thanks for having me!
I have a 91 polaris Trail Boss 350L 2x4 that was just purchased. I am now getting a HOT sensor as it is overheating. I filled the antifreeze (may have overfilled it) and took it for a ride. Within 5 minutes the HOT sensor comes on. I burped the antifreeze using the 10mm bolt on the engine but it only spurted out. When the key is turned the fan comes on immediately. Even when it was not running prior.
Any help would be greatly appreciated and thanks for having me!
#2
Bleed air from the 10mm bolt with the engine off only.If the fan fails to come on and the hot light comes on ,the radiator sensor may be the problem as they were prone to burnout if coolant got below the top of the radiator.This item is NLA from online sources. You can take it and match up the sensor at most auto stores.Item #30 in the parts break down.
#4
If the fan comes on when you turn the key on, the switch in the radiator sensor has melted and powers up the fan. Sensor need to be replaced. You may have to splice your wiring into a new sensors as most will be just a two pronged type replacement,no wiring harness.The pic is just an example of a sensor. If the hot light comes on,you may still have trapped air in the system.
#5
#6
Bleed with engine off.. Make sure all air bubbles are cleared before you close the 10 mm bolt. Item 30 and the sensor pic is one and the same only yours has the harness built in. It's what triggers the fan when the temperature is around a 175 degrees. Here's a pic of your old sensor. Just make new spade connectors for the replacement switch.
#7
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#8
Burped it last night with the engine off - some antifreeze was flowing out and then stopped. The fan still turns on when the ignition is in the ON position. I looked at the sensor that you had said to check - looks like the wires were cut/broken and never reconnected. The previous owner must have over ridden the sensor and went straight to the ignition. Will this cause the ATV to overheat if the fan is wired to come on when the ignition is turned on?
Thanks again!
Thanks again!
#9
#10
Burped it last night with the engine off - some antifreeze was flowing out and then stopped. The fan still turns on when the ignition is in the ON position. I looked at the sensor that you had said to check - looks like the wires were cut/broken and never reconnected. The previous owner must have over ridden the sensor and went straight to the ignition. Will this cause the ATV to overheat if the fan is wired to come on when the ignition is turned on?