Very strange. I wonder what the problem is then. I have changed the starter in the last year with OEM starter, alternator was also changed. Battery isn't new, but have tested it and it is as good as it should be. Changed the CTS with OEM. Checked all glow plugs and they are running correct resistance. One thing I did notice is when i checked the ECU info with a code reader, the ECU was reporting 46*F when it was well below freezing outside (the car had been sitting for 8-10 hours in this temperature). No codes are being thrown. I spoke to my VW guy, and he said he had this problem with an 01 ALH in which he did the Hamman mod which fixed it, didn't have any other issues with it. I too think there must be something else going on, since the affected models are the 99.5, but I a) feel like I've exhausted my realistic options; and b) I haven't the money to replace the entire guts of the car to figure out what might be causing this problem. But unplugging the coolant sensor has been my solution for the last week or so. I will take your advice Vince Waldon and call the dealer to see if they have any insight. Thanks all for the quick reply. This is a very annoying problem, but I appreciate everyone's help.