Postby smj999smj » Sun Oct 12, 2014 9:27 am
I kind of doubt that it is an air pocket situation if it's something you did in the summer time, as you probably didn't loose enough coolant to create an air pocket with just disconnecting the throttle body hose and any air should have cycled it's way out by now. The R51's use a coolant system similar to many European vehicles, in that the radiator cap is not vented, rather the reservoir cap is. These systems are usually less prone to getting air bound. While there is a air bleed nipple with a rubber cap on it on 05-07 models, which is on the plastic coolant "tree" (for lack of a better word) on the passenger side of the engine compartment, near the firewall, where the heater hoses split-off to the rear heater, there is no such provision on 08-and-later models. The best way to purge the system is to make sure the radiator is full, install the radiator cap, fill the coolant reservoir to the "max" line, install the reservoir cap, park the vehicle on an incline with the nose uphill, start the engine and turn all heaters to the "maximum heat" setting and let it run. Other reasons for no heat could be low coolant level, stuck open thermostat, bad temp mode door actuator, wiring short/open, temp sensor (auto climate control) or control head. If the purge doesn't work, I would start by taking a look at the mode door actuator as they've been know to go bad. Unfortunately, some of the actuators need the dash removed in order to replace them and off the top of my head, I don't remember if that particular actuator is one of them. As far as the coolant, green or universal coolants will work fine. Around 2010, Nissan started putting longer-life, blue coolant in their vehicles.