Where is the heater control valve on a 1966 Ford F100?

The heater control valve on a 1966 Ford F100 is located inside the cab, under the dashboard. It's not easily accessible without some disassembly of the dash. There isn't a single, universally placed component; its exact location varies slightly depending on the specific trim level and whether it's a cable- or vacuum-operated system. You'll likely find it near the heater core hoses and possibly connected to a cable running to the heater control on the dash.

To locate it, you'll probably need to:

* Consult a 1966 Ford F100 repair manual: This is your best bet for precise location and diagrams.

* Look for the heater hoses: Follow the heater hoses entering and leaving the firewall; the valve is usually found nearby.

* Carefully examine the area under the dash: You'll likely need to remove some trim panels and possibly the glove box to access it fully.

Be prepared for some disassembly and potentially tricky maneuvering. Be sure to label and photograph components as you remove them to help with reassembly.