i did ood trk and coober a while ago in d2 td5 and found 28psi all round ok. but be advised about the heater hose on drivers side botttom of radiator about 40mm from fan blade! make sure that hose is secure so as to not be hit by fan - -bugger ! tie the hose secure!! taking a piece of 3/4 inch copper pipe will ensure all is ok. as in previous post pink roadhouse comments are valuable.