Is it possible to use the chiller in the glovebox and the one under the light switch whilst your heating is on?

Or will the temp control for the air con control it or is it constantly cold?

The air from the glovebox and can cooler box is at the same temperature as the air coming out of the heater. Hence the possibility of exploding coke cans

Hence the possibility of exploding coke cans

I demand proof of this working before I start strategically placing cans in my friends cars....

The air from the glovebox and can cooler box is at the same temperature as the air coming out of the heater. Hence the possibility of exploding coke cans

Not true. The glovebox air is taken from the stream BEFORE the heater matrix, but after the air con evaporator. Therefore, as long as the air con is on, the glovebox will be cold. The air for the can 'cooler' comes down a piece of hose from the driver's window-side vent, so this will be at whatever temperature the heater / air con's set at...

HTH