What could cause the heater on your 1999 Ford F150 not to heat?
Low coolant, weak thermostat, plugged heater core/ and or( if it has) defective heater control switch.If system is low on coolant, fill to top and try it; but keep an eye out for a coolant leak. Take you hand and place it on the two heater hoses going through the firewall. They should both be hot to the touch when the engine is hot.If only one is hot, then you could have a plugged heater core. If engine temp gauge shows that the engine does not warm up, replace the thermostat. I hope this helps you.
Answer The most common heater failure on the F150 is operation of the blend door. Check www.heatertreater.net for diagnostic information and an inexpensive fix.
I had my heater core changed on my 1999 ford f150 and now when you turn on the ac it blows hot air how can i fix this?
After replacing the heater core in a 1999 F150 the air conditioning no longer works what went wrong?
block heaters are not standard on f150's. Thus if it was ordered with the option, dealer added or aftermarket installed it may have a block heater. Best way to find out if there is a block heater is to look very closely behind the grill and look for a plug that looks like a male end of an extension cord.
Is there a fuse to make heat for a 2002 f150 have heat running through the hoses but no heat from the fan just cold air help.?
First thing to check is that your coolant level is full in the radiator. Low coolant will cause exactly the problem you describe. If the coolant level is okay there are a few things that can cause the heater not to work. A bad control panel, a heat thermister (usually located on the heater box under the hood) some have a fuse that controls the heater but most just have a fuse for the heater…