Another heater issue

[Robwhite]

My heater seems to work just fine when I'm moving, but if I'm stationary it only gives cold air. I've been out on some pretty cold days over the last six weeks and have stayed warm even with the roof down. It was a right pain yesterday when I thought I'd polish up the inside with the heater on to keep me warm, but even with the engine warmed up and with the fans blowing it would only give a cold blast. Any ideas?

Rob

[peaktorque]

Sounds like poor circulation.

On the move your water pump is spinning faster, thus better water flow.

Could be an air-lock but I doubt it. Maybe a bit of a restriction somewhere, you could check for kinked hoses etc. You could also try a flush to clear any crap that has built up in the cooling circuit.