cold air on one side and hot air on the otherside ??
 

I notice a problem with my ES350 2008 today and would like to have your inputs before sending to the garage.

When the climate control is ON, the passenger vent and the central right side vent is blowing hot air, but the left side of the central dash vent and vent on the driver side is blowing cold air.

I increase the temperature on the driver side to the max and then and only then hot air is coming out, very weak. On the passenger side, the temperature is very precise, no sign of weakness.

The car has 150k miles.

What could it be ?

Left electromagnetic valve probably.

thank you for your input, but strangely, after restarting the car numerious time, all air vents is blowing air equally, so i would say the problem is resolved.