Parts for your 1999 Ford Falcon-Heater tap

1999 Ford Falcon Heater Tap — What It Does and How to Look After It

Yes, a heater tap is used on the 1999 Ford Falcon (AU series). This is confirmed by multiple technical sources: the Ford Falcon AU Series Workshop Manual (Heating, Ventilation and Air Conditioning, Section 412-02), Gregory’s Service and Repair Manual for Ford Falcon AU 1998–2002, and local parts catalogues from Dayco and Gates that list a dedicated heater control valve for AU models. Those references detail a coolant shut-off/bypass valve in the heater hose circuit on AU Falcons, fitted in the engine bay near the passenger-side firewall.

The heater tap’s job is simple but important: it regulates hot coolant flow to the heater core. When the cabin dial or climate panel calls for heat, the tap opens, when cool air is selected, it closes or bypasses flow to keep the cabin air from picking up unwanted heat. That helps cabin comfort and can slightly improve air-con efficiency on warmer days by keeping the heater core from fighting the evaporator.

On many AU Falcons the tap is vacuum-operated, some variants use a cable-actuated unit. Either way, age and heat cycling can make the plastic body brittle, perish the diaphragm, or seize the internal shuttle. If the tap fails, owners may notice weak or no cabin heat, heat that won’t switch off, or coolant weeping around the tap and hoses.

• Typical service advice for a 1999 Falcon includes inspecting the heater tap and its hoses at every coolant service for cracks, leaks, or sticky operation.
• If replacing, match hose orientation and flow direction (the tap body is usually marked with an arrow). Renew spring clamps with quality worm-drives or new spring clamps.
• Check the vacuum line or cable adjustment so the tap fully opens and closes with the control.
• Refill with the correct coolant mix and bleed air, recheck for leaks under the bonnet after a short drive.

There’s no hard replacement interval, but given AU Falcons are well past two decades old, many shops in Australia and New Zealand treat the heater tap as preventative replacement whenever cooling system work is being done or if any seepage is present. It’s an inexpensive part that can save a roadside drama if it lets go. If the cabin still runs hot after replacement, look for blend door operation, heater core restriction, or vacuum supply issues.

Popular questions about the 1999 Ford Falcon heater tap

Where is the heater tap on a 1999 Falcon?
It’s typically mounted in the engine bay on the passenger side, close to the firewall where the two heater hoses pass into the cabin. Look for a small plastic valve body with two to four hose connections and either a vacuum line or a cable attached.

Can a 1999 Falcon be driven with the heater tap bypassed?
It can be temporarily bypassed by joining the hoses to get home or to a workshop, but that’s only a short-term fix. Bypassing removes cabin heat and can mask other issues. Replace the tap promptly and refill with the correct coolant.

Do all AU Falcons have the same heater tap?
Most AU models use a similar valve, but there are variations between manual A/C and automatic climate control and across six and V8 trims. Always match the replacement to the VIN and build date, and check hose sizes and actuator type.