If the heater is not working (fan is not turning), but you are able to press the climate control buttons to activate the AC and venting, then the relay (actually this is the ACC in the dash with the buttons, there is no separate relay that controls the AC/Heater fan) is not the problem. Check the fuse box in the right side engine compartment, then check the long 3A flat fuse located in a coverd case atop the the wheel well in front of the fuse box. If these are okay, the fan motor is the problem. If the motor needs to be replaced, you'll need to remove the front cowl under the windshield, and also the windshield wiper assembly. The motors usually bind after 20+ years and need to be replaced. Sometimes, they will bind, then work again. Sometimes they'll bind and blow the long fuse. The job takes about 2 hours and the motor is about $150-$250.
This link gives you step by step instruction on how to remove and install a blower motor:
http://190rev.net/forums/showthread.php?t=34141&highlight=blower+motor+removal+installation
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