rtlillie

I got a 1998 Mack CH613 that shows the electronic malfunction light. I changed the radiator due to the old one leaking and after I replaced it I filled the antifreeze to the level. After start up the malfunction light came up and I checked all fluid levels and they were all fine. I also checked all sensors and harnesses and they were all fine. I checked the codes in the ON position and it showed 1-7. Now I read online that I should look in the owners manual. The problem is I don't have a owners manual and don't know what the code 1-7 means or where the problem is located. If you guys could help that would be great. Thanks

1-7 code is low coolant. unplug the coolant sensor on the plastic tank and hook up a 12 volt light tester to the plug and start the motor. if the malfunction light stays off replace the sensor.