Hi guys, got a prob with my JZX100 Chaser (1JZ-GTE) and just thought I'd ask here. My heater has stopped working when I turn the climate control temp up but when I come onto boost hot air starts pouring in through the vents (even when the AC is on). It takes a while to return to normal. I can drive off boost and it's fine. Is there a valve or something that could be stuffed? The water tap appears to be functioning correctly. I did a diagnostics check on the climate control system (press and hold Auto + Recirculate and turn on ignition) and got out error code 21, which is documented as "Solar sensor". I don't really see how the operation of the solar sensor could be related to boost. Anybody got any ideas? Cheers.