2007 Deere 750j, is there one or two valves to open for heater?? I found one kind of in between the two fuel filters. Is there one somewhere else??
Should just be that heater valve near the fuel filters but I think where to coolant lines connect to the block there are also some valves that could be opened or closed to prevent coolant from flowing.
Ok thanks. Don't have much heat. The valve next to filters was open. Might be having a thermostat problem
Basic diagnostics, is the return line as hot as the supply line? If they're both hot, then the problem is in the air side. If neither are too hot to hold comfortably then you're not getting enough coolant flow through the heater core. Could be a valve partly closed or plugged heater core if the coolant has had hard water added, or low coolant. Is the block too hot to keep your hand on? then that's not why the heat is low.