My 2004 Crown Victoria’s blower motor started acting up, making proper air conditioning in the Florida heat impossible. The car utilizes an EATC system (likely standing for Electronic Automatic Temperature Control) which automatically regulates air temperature and blower speed based on the desired setting. The blower motor’s speed began fluctuating erratically. Research on crownvic.net suggested a common issue is a faulty solder joint within the blower control module located in the A/C system’s air intake near the firewall.

Contrary to some online opinions, accessing the module wasn’t too difficult. Here’s a breakdown of the process:

The module is found beneath a collection of hoses that need to be detached.

Fortunately, the heater core hoses are positioned at the cooling system’s highest point, eliminating the need for a system drain. Minimal fluid escapes when disconnecting the hoses with a cold engine (it’s recommended to do this in the morning before driving to prevent potential burns from hot coolant). Using a plastic tub underneath the work area collected any leaking fluid.

The blower control module, a black unit with an orange tag, is revealed after hose removal. It is secured to the A/C box with two screws.

A 5/16 nut loosens the module:

The extracted module has two screws holding it to the plastic casing that need to be removed to access the board.

The board removed from its plastic casing.

The five connector assembly pins required resoldering. As anticipated from the online forum, the left large connector pin exhibited an intermittent connection, confirmed by multimeter testing while manipulating the contact. While the remaining four pins appeared fine, all five were resoldered for preventative measures.

Resoldering proved challenging due to a protective film on the board affecting solder flow. Nonetheless, the repair seems successful. After reinstalling the module, everything appears to be functioning correctly.