chevyguy14
Member
Hi I’m having an issue where my 247b3 won’t blow heat. I took it out today and ran it to warm it up and then I lifted the cab and felt the two lines coming out of the heater core and they were both cold. So I traced them back to the engine and the hose that comes out of the regulator where the thermostat is was hot near the housing and then the line stays warm for about a foot and then it’s cold. Does this mean my thermostat is bad or some sensor? I haven’t had any issues with it overheating or anything though. Also the heat worked great in it last winter so not sure what’s going on. I would appreciate any help. Also the serial number is TSL01509 if that helps. Thanks