I know I have posted this before but wanted to try again. I have an early 2188, before the serial number brake. In the evening when I try to heat up the cab the windows fog over very bad sometimes like you threw a bucket of water on them. Clean cab air filter and it makes no difference. If I leave a/c on high rather than heat I have no problem with the windows, but I freeze to death. Is their a change or update from caseih or some other problem. Never talked to anyone that had this much trouble. Any help would be greatly appreciated.