Ford Repair Questions? Ask a Mechanic for Answers ASAP
The heater air plenum chamber (18471) is located under the instrument panel (04320) on top of the heater core housing. For servicing the heater air plenum chamber , A/C plenum vacuum harness (18C581) , and plenum doors, it is necessary to remove the instrument panel . It is not required to remove the instrument panel to service the vacuum control motors (18A318) attached to the heater air plenum chamber .
1. Remove instrument panel, and steering column.
i would suggest purchasing a chiltons or haynes manual from an autozone, or ebay.
heres a link to one on ebay. for $23 with free shipping. these are getting harder to find.