Re: no heat in my SHO
Are you having any leaks?????? Make sure the coolant level is filled to the appropriate line when the engine is cold.....not hot. Let the engine run and check for any leaks. Your coolant temp sensor could be wrong. I'd go ahead and pull it out and replace it. It's just a simple thermistor sending unit and really cheap. Don't buy it from ford, just pick it up from a local auto store. If the engine is still running hot, the thermostat could be stuck, but I doubt it. If the engine temp is normal, and you're still getting cold air when the heat is on....check the heater hoses running to the heater core. There will be two hoses, they should both be hot. If both are not hot, you have a clog in the hose or in the heater core.
Those hoses are pretty large in diameter and fairly hard to plug, so I would suspect a clog in the heater core. I had this in my 99 taurus a few weeks ago. If you suspect a clog in the heater core, simply pull the heater hoses off the core. (two heater hoses that run into the firewall) once their off, attach a normal garden hose to one side of the heater core. Try to flush it out. If there isn't a clog, then I would suspect a blend-door actuator problem or maybe a valve problem. I'm sure your car is different from mine. You best bet is to get a 'haynes' manual so you know where everything is, and start trouble-shooting. I would really suspect that your heater core is clogged. Hope this helps