Nissan no heat
Fix Nissan no heat condition
If you’ve replaced the coolant in a Nissan and now have a Nissan no heat condition, check the air blend door and the blend door actuator to see if they move when you change the temperature on the HVAC control panel. If they move, then you need to properly bleed the cooling system to remove the air.
How to bleed air from Nissan cooling system
There are two ways to do this:
The easiest is with an AirLift air bleed tool that puts the entire
cooling system under a vacuum.
Or, follow the official Nissan cooling system bleed procedure.
1) Raise the front of the vehicle about 25 inches
2) Start the engine and let it warm up. Then run it at 2000 RPM with a radiator fill funnel in the radiator.
3) If you still don’t have heat, check to see if there’s coolant flow through the heater core. Remove a heater hose and connect a clear vinyl hose between the heater core and the heater hose so you can see if there’s coolant flow.
If there’s low flow, connect the two heater hoses together with the clear hose in the middle so you can observe the flow with the heater core out of the system. If there is still low flow, the heater hoses have a restriction. If there is good flow, the heater core is clogged. Perform a backflush. suspect a heater core issue.
©, 2022 Rick Muscoplat
Posted on by Rick Muscoplat