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To look up wiring I need more info, What is the model? Is it a 2500 or 3500, what is engine size?
Check the blower motor wiring connector for voltage and ground with hvac on.
Can you check for hvac trouble codes? Some of the national brand auto stores will check some codes for free.
hi check the coolant level it may have dropped slighly causing the idle cotrol valve to play up
you may have to bleed the cooling system once you have done this there is a bleed nipple near the distributer undo this while the engine is running and the heater is switched to hot but the blower fan
is off bleed out some coolant until the air stops bubbling out if this doesnt work you may need a new idle control valve situated behind the inlet manifold near the firewall
Sounds like you need to replace blower motor speed cotroller, located underhood right rear of engine on A/C / Heater case on firewall, rectangular in shape. When fan stops working tap on controller, fan should come back on then you will know that is problem. Have seen this many times on this vehicle. Hope this helps, have a good one!
Hi there, very common on these vehicles, you need to remove the heater cotrols and check that the cable hasn't come out, usually the clips that hold the cables in place break causing the heaters to not work properly, Nissan do modified clips now to stop it from happening, it may need a cable too if its too far bent, hope this helps.