Heater works when it wants. Doesnt have a pattern, its just random. No coolant leaks. HVAC fuse is good. filter and hoses clog-free. i dont know what else could be wrong.Related Questions2005 cobalt2005 chevy cobalt makes a click click click noise seconds after turning off the ignition2006 suzuki reno i have check engine light on so i wanted to know the codes on it problem is when you plug the scanner in it wont show any codes it comes up as its not plugged in or no power to device i was told by…2007 suzuki renoI have a 2007 Suzuki Reno. I think it needs a tcu. Do I have to take it to the dealer if I buy a used tcu for reprogramming?