Have a 2000 ford escort zx2 won't heat inside the car temp gauge works cars not overheating blower is working just blows cold
Possibly the valve that the Ford Escort has, that shuts on/off the flow of coolant to the heater core, it may be stuck closed or it is vacuum operated and the vacuum hose has come off or developed a leak severe enough to not allow the valve to open
Otherwise the heater core may need a flush, remove both heater hoses from valve... and a simple, no cost way to flush is stick a garden hose in one end, let her fly with water, then do the same opposite hose...other direction. Just get some sort of fitting that is tight in ID of hose, and don't allow the outflow all over your engine, it will go in one way and exit the other hose, both ways.
we had a 1/2 pipe with a shroeder valve on it for doing exactly this task~
nothing convinces like a high pressure blast...to take out an eyeball if not careful~
is it because one of these cheeep butyl rubber hoses has rotted and fallen off? do you suppose....I'd replace each and every hose with silicone for a tightly solid vacuum system~
That's a dad-gum fact. If the water at first seems to build up pressure, then suddenly comes out like a rocket with red/rusty water and pieces of solid material, then all that junk was in your heater core, and then flows freely.....success, you have flushed your core and without toxic chemicals in the process.
Does the car have or has it ever had an aftermarket radio? The cable that goes from the temperature knob to the blend door on the drivers side of the footwell may have popped off. http://www.alldatadiy.com/alldatadiy/DIY~G~C41407~R0~OD~N/0/808 51247/83204708/83204719/110671822/34853741/34865608/69983487/ 69804733
When this cable is off it is cold and this is because gravity makes the blend door close so that the fan's air is not routed through the heater core as in the case of the summer and cold selection on the knob. It fails cool even if the heater core is hot. You can check both heater hoses and if they both warm up your heater core is not blocked and it likely is this blend door cable is your problem.
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