2001 Nissan Maxima - Blower sometimes switches off

[wazzupwaleed]

Hi,

my maxima's blower sometimes doesnt work even though i know the heater is on. So i turn off the car and then return after a few hours and it starts working. Sometimes it doesnt work in the start and then after running the car for sometime it starts. And ryt now its jst not starting. I do not think the blower is gone bad since when the blower works , it blows really well...So please help me with this confusion.

Thanks for your expertise

[loystock]

Blower operation is affected by ambient temperature and other AC-related sensors. If you are starting 'cold' (coolant temp <122F and ambient temp <59F) the blower operation may be delayed up to 126 secs (@ 2 mins). Maximum delay may happen if the ambient temp is very low (as in winter in NB). After this delay, the blower will run at low speed until coolant temp exceeds 131F, after which it will run at target speed.

The blower motor operation is controlled by the Fan Control Amplifier FCA, essentially a power transistor) by varying the blower voltage from 5-12VDC. In turn, the FCA gets control (bias) signal from the Auto Amp using various sensors and AC modes.

If the blower operation is really abnormal or erratic, you may have a loose connection to the blower motor and related components. You may also have a problem with the coolant temp sensor (not likely since it will affect your idling) or ambient temp sensor.