Scotty, ‘07 Maxima when stopped and at low speeds the cabin heater blows cold even when thermostat is set hot. At higher speeds, over say 40mph, warmer, but not hot, air can be felt, no matter what the mode setting is at. What could be causing the problem and could it be a DIY fix? A follow up question is would a BLueDriver scan tool shed light on problem?
Partially blocked heater core, faulty heater control valve, heater blower resistor, blending door stuck. Scanner probably won't show anything.
Okay. Those suggestions help narrow things down.
are the heater hoses hot?
Hopefully it's simple like a blend door/blend door actuator, that you can do yourself no problem.
On my 99 F150 instead of paying for parts I just switched the blend door by hand as seasons changed & kept it in place with a stick then used foil HVAC tape to seal the box back up. Worked great for a couple years then my condenser gave up the ghost so I kept it on hot & windows down when I needed cooling.
It was a $500 truck with a rotted frame cracked in three places so I wasn't going to put money into it if it wasn't necessary so I could save up for its successor (which is horrible in its own unique manner).
