Ok so ive been looking through the forums for a while and this is my 1st post
recently bought a 2005 ZT 190 with 64k and full service history
only problem is.... the heaters are cold :S
got told this could be a problem with the heater matrix so i took it out, cleaned it thoroughly until it was getting hot all over and put it back in
still cold.....
thought it may be an airlock so continued to bleed system through and still nothing.... until....whilst engine was running i undid the cap to see how much pressure was in the system and low and behold... HEAT!
But when u tighten the cap back on it goes cool again, i am completely stumped...
also just tried the ATC diagnostics check and came up with no fault codes
any help would be greatly appreciated
Thanks
Nick