Hi and welcome to the forum. I have had a new dual mass flywheel and clutch and concentric slave cylinder and it crunched in 1st and 2nd for a while. It seems to have got better tho. I had mine about 6 wks ago. If you have a heat haze from the small exhaust on your aux heater then i would have thought that is normal as when i fixed mine with the addition of a new glowplug that is what i saw plus the jet noise. If there is a problem with smoke pull the number 12 fuse and that will stop the heater from working until you get it fixed.