I have a 67 coupe and need to change the heater hoses. It looks like I need to drop the heater to get at the hoses inside the car. How do I drop that heater? Are the 5 nuts under the hood around the heater fan motor all that holds that heater in? I looked under the dash and can't see any other way its held in place. Any help would be great. This is one of the last things I need to do for the car to be finished. Thanks