having bother with intermittent fault on imobilizer 9 times out of ten no trouble firing up but sometimes glow plug light on dash wont light up hence not firing up but if left for hour or two fault goes and fires up any thoughts ppl also blower fan works on 3 and 4 but when using a/c it wont work on 3 and 4 but comes on on 1 and 2 speed becoming really annoying any one enlighten me plz, bob