I have a 97 F-150 and my heater does not work. The blower works fine, and it switches from defrost to floor to dash fine. AC works great just no hot air. Does anyone know what is wrong?

------------------
97 F-150 4x4 3'lift 35's exaust, bumpers, intake

 

Since I'm not sure if you bought yours used...
Have you checked if your heater core is getting engine coolant. Sometimes when a heater core develops a leak a lazy owner will bypass the heater core, or just disconnect it altogether.

------------------
MarkS
1999 F-150 XLT, 4x4, ORP, SC, SB, 5.4 Liter, 3.73ls, Husky Truck Box, Westin Chrome Nerf Bars, TOFF Spray-in Bedliner, FORD Blue-Oval Hitch Cover, & Superchip.

 

check and see if your low on coolent?
it's happened to me before

------------------
99 XLT SC 4x4 STYLESIDE ORP 5.4,AUTO & 3.73 POSI
MED. TOREADOR RED
EXTANG TONEAU,BED MAT,
K&N FILTER & WOOD DASH KIT

 

Maybe a disconnect somewhere on the middle **** and the last time the connection worked the **** was aimed at the blue side.

 

Check the heater core and check the coolent level if its low and you find a leak in the heater core thats most likely your problem.

 

It could be the blend door as Raoul suggested. This happened on my Escort because the temp control connecting rod was right next to the accelerator and it would get kicked off.

In my F-150, when I use the far right selection **** for the first time in the morning, I hear a banging sound when the air flow selection door moves into position. Something is sticking or there is no cushion or bumper to absorb the shock. Let us know what the problem is when you get it fixed.
JB

------------------
1999 XLT 4x2 SC - DOB: 7/19/99
Dark Toreador Red
4.6L, Auto, P255/70R-16 OWL, 3.55 LS, Rear Slider, Towing pkg, Pwr 40/60 Bench, RKE
Added:
Ford drop-in Bedliner
Ziebart rustproofing
Smittybilt nerfs - textured black #FN1730-S4T
Ford molded splash guards

1998 Windstar
1993 Taurus

 

I have heard two different things one. Ford screwed up in buinling the blend door too big for the hole causing it to stick to the housing (this could be your banging noise)and the second is that the computer that controlles this system is bad but the dealer does not know the part # to this box. It is behind the glove box and on top of the heater core housing.

------------------
97 F-150 4x4 3'lift 35's exaust, bumpers, intake

 

I found out that this is a common problem. It seems that the problem is the quick connect inlet and outlet tubes on the left side of the firewall which heat the heatercore make sure that are connected properly by disconnecting them andb checking for flow. I hope this helps someone.

 

Well, I was having the same problem, no heat. Checked my anti-freeze level and it was almost a gallon low. Filled er up and wallah, mucho heat. The question is how did I loose that much fluid. I have never seen a leak or fluid on the ground?

 

Wish I was so Lucky, I've got flushed my radiator twice, still no heat.