Ford Truck Heater and A/C Not Working?

poehere
Bronze Post Medal for All Time! 105 Posts

October 4, 20170 found this helpful

Here are a few things that you should check:

1. Check your heater core. See if you need to replace this. Make sure you it is getting warm.
2. Check all your heater and AC hoses. Some might need to be replaced.
3. Check the vent to the core. This vent needs to be opened to allow the hot air to blow into the cab of the truck.
4. Check the cable on your inside adjustment for the AC and heater. It is behind the knob that you adjust. Make sure the cable is attached and not broken. This cable goes to the mixing value which goes to the heater core and allow the hot air to flow through.
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5. Check the white vacuum line underneath the hood on the passenger side. Make sure the hose isn't cracked or broken. This goes to the cylinder in the back firewall of the truck. Follow the hose back to the firewall and cut it off. Buy a new hose that is a 5/32 vacuum hose around 20". This will slide into the cylinder and the other end to what is left on the harness.

coville123
Silver Post Medal for All Time! 433 Posts

October 16, 20170 found this helpful

Blowing cold air.

Step 1
It could be the blend door actuator.

Step 2
It only costs about fifteen dollars.

Step 3
Not sure of cost to have it installed.

Step 4
Also check thermostat,coolant level and coolant flow through the heater core.

Step 5
This is quite common problem with a Ford.