When you turn up the A/C heat in your truck and see no change in the amount of air coming from the vents you likely need to replace your blower motor. Replace Part Number : 700014, 615-00463, EOTZ 19834 A, 1W7Z 19805 BA, MM-929, PM287, 15-80094 Fit for Ford Bronco 1980-1986/ Fit for Ford Country Squire 1987-1991 Fit for Ford Courier 1980-1982/ Fit for Ford Crown Victoria 1992-2011 Fit for Ford F100 1980-1983/ Fit for Ford F150 1980-1986 Fit for Ford F250 1980-1986/ Fit for Ford F350 1980-1986 Fit for Ford LTD 1979-1986/ Fit for Ford LTD Crown Victoria 1987-1991 Fit for Ford LTD II 1979. Fit for Lincoln Mark VI 1980-1983 Fit for Lincoln Town Car 1981-1997 Fit for Mercury Colony Park 1987-1991 Fit for Mercury Grand Marquis 1979-2011 Fit for Mercury Marauder 2003-2004 Fit for Mercury Marqui 1979-1982. How to replace? 1) Locate the blower motor under the passenger side dash. Removing the dash may be necessary to access the blower motor on some vehicles. And disconnect the blower motor electrical connector (Note: On older vehicles, the blower motor may be located in the engine compartment on the passenger side firewall). 2) Remove the retaining screws to the blower motor assembly. 3) Remove the blower motor retaining screws. Remove the motor from the box. 4) Compare the new blower motor to the old one to verify that you have the correct part. Install the new motor into the box and tighten the retaining screws. Re-install the blower motor assembly. 5) Connect the blower motor electrical connector. 6) Operate the heating and A/C system. Verify that the blower motor operates at all speeds and that the system produces hot and cold air