Cold air one side.

Hi,

SORRY BUTTTTTTT.

I cant find the thread i was looking at the other day that covered this subject so ill do my own.

Cold air comes out of one side of the heater (passenger side)

Does anybody know how to resolve this so that the heater work as it should.

The HEVAC system use 3 'Blend Motors' these are servo motors that open and close the flaps to distribute warm air, cold air and also the direction of air.

One is mounted on the passanger side of the heater box
Two are mounted on the drivers side ofthe heater box

On the drivers side the top one is the distribution flap motor and the bottom one is the heated air flap motor.

When you select a temperature the motors open or close the heated air flaps and then automatically adjust to maintain that comfort setting.

The top one distributes the air from the fave level vents to the screen and the footwells....

They are notorious for failing, breaking or stalling.

They are also a huge pain to get at....the official procedure is to remove most of the dash to get at them, although a number of short cuts have been found...check out RANGEROVERS.NET HOME as this has a very good walkthrough.

The passanger side is easier to get at, remove Glove Box, remove air bag and it is right in front of you, although you have to get physical with the air duct that runs across it, to get a screwdriver on the mounting screws...

The drivers side is a pain, as you ahve the steering coloumn etc to contend with, and the general procedure is to remove the instrument binnacle, remove the under dash trim, remove the side panel, remove the footwell vent, get super physical with the air ducting in front of the Blender Motors....

The officical procedure calls for you to remove the centre console stack too so you can plug the wiring in (as all three are wired to the same plug socket) but it is possible to cut and splice the new motors into the existing loom (aslong as that is not where the fault is)

Get it on a diagnostic first though as it may just need a force calibration (you may be lucky) or if there are any other faults first before the nightmare of getting at them....

If you have to change them, you will need to plug it into the diagnostics afterwards to complete the blend motor calibration, so the servo motors know where the hot and cold positions are etc.

That was helpful and to the point.
Thank you,
It will give me something to think about.

Would you know. Is it possible to manually manipulate the flaps so that they stay in one position?

THE BUDDAH said:

That was helpful and to the point.
Thank you,
It will give me something to think about.

Would you know. Is it possible to manually manipulate the flaps so that they stay in one position?

Click to expand...

Only by taking the motor off the drive spindle.....

I did this to my passanger side motor as this is easiest to get at....

I took the motor off, then cable tied it in the HOT position (as the drivers side gives cold anyway)...so when I want heat, I close the vent on the drivers side and open the vent on the passanger side, and vice versa for cold air....

I have yet to muster the courage to tackle the drivers side motor..!!