Jeaton

Beginning of spring I noticed the lack of heat in my 99 F150, along with a faint smell of coolant, and my windshield becoming oily. I'm really hoping it's not my heater core, and something simple such as a leaky hose near the firewall, but I'm sure that's not going to be the case. Anyway, is there a simple way of testing what it is, also if it is the heater core, is there a hack of some sort of removing it, besides tearing out the entire dash, it's an old truck, I'm not worry about it looking pretty, just as long as I have heat.

OhioLariat

Well. I think you already know the answer on what's wrong, even if you don't want to admit it.
And while you can cheat on replacing the blend door/actuator by going through the glove box, yanking the dash is the only way I've seen to get to the core.

..

DirkDiggler87

If you decide to replace the heater core, here are some good instructions

https://docs.google.com/document/d/1...sBaH8IdJ0/edit

jprevat

iTrader: (1)

If you want a temporary go around to test it, cut the heater hoses about halfway to the firewall, and pick up a brass heater hose fitting from your local parts place and loop them together. If it quits fogging your dash go ahead and set aside $800 or a weekend to get the heater core done. If you do this lay plastic over your coils and be prepared for the hoses to spill into a catch can or something or a misfire will be in your future. Good luck.

01-7700

I'm wondering how it could be anything other than the heater core.

It only takes 12 minutes + 60 seconds to remove the heater core !!