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Right now look at the front of the engine behind the exhaust manifold and their are two breather pipes connected to a T connection that comes from the engine and check these pipes as if perished and split the engine will not idle .You cannot adjust anything without a dealer software to reset the mapping so check these pipes first and iam sure you will find their split and gone soft
Cars usually overheat when the thermostat is faulty, coolant level is low, or the water pump fails. If your cooling fan on the radiator does not kick on shortly after the engine reaches operating temperature, you may have a bad cooling fan, cooling fan relay, or cooling fan fuse. If your engine is overheating, start by checking the fluid level, and installing a new thermostat.
if you have 14 volts or more at the battery at 1000 rpms, the battery & alternator are fine. If you get the same surge when you turn the bower motor on high speed, it is just the normal load on the alternator as it puts out more current. The engine is supposed to compensate by kicking up the idle. It does this through the IAC, idle air control. You may need to clean the IAC passages and the throttle body passages. I also would clean the MAF sensor heated wires with carb cleaner or MAF sensor cleaner. The MAF is in the iar intake hose and has a 2 or 3 wire connector going to it. The heated wires are in the air stream. Then disconnect the battery for 2 hours to clear the "Keep alive memory"
It will relearn after you drive for 10 miles. May run rough for that time.
your damper doors are not closing in the box itself properly and also you need to check the flow rate trhough the heater core its highly possible the heater core is possibly clogged with dirt and debrise' sometimes you can just reverse the ehater hoses and drive the vehicle for a few hours or even days and that bach flushes the dirt out of the core then you will need to drian your radiator and refill with clean antifreeze