Hi, I own a 2004 Terracan. Recentely the windows have been steaming up and the heater will not clear the windows properly. The air con still works and I am still getting heat. I have checked around the carpet and it is not damp. I fear that this may be the heater matrix as I am loosing a slight bit of water. Any suggestions on what else it could be before I pay the expense of a heater matrix. Thanks.