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Originally Posted by mastermech
your idea could work, it depends on how much scale is built up. I've never had to replace a core to get the heat through, just leaks. You were wondering about the lines on the gauge ford usually has their gauges read 1/3 to a just below the halfway mark. if you aren't getting it properly warmed up, then that is the major reason for not enough heat (yes a car can be over cooled) check and replace the thermostat as necessary. If I recall right the operating temp is 192F for your vehicle.
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Exactly as you said. I took the thermostat out and there it was in front of my eyes: a stuck open thermo. Couldn't believe it. I forced it with a screwdriver from underneath and "click" the middle copper rod in the thermo sat in its place again. How does this happen ? I don't know. Must be a deffect from the manufacturer. I can't understand how the pressure of the water can do this. The spring which holds this rod is strong. o.k. Nevertheless I put a new thermo and THERE YOU GO ! I not only got good warm air inside my car but the temperature gauge is now showing 3 lines up.
I hadn't blame the thermo because I had the false appreciation that even though a thermo would get stuck open, the motor would get inevitably hot after 1/2 hour at least of running. But the case is that water, somewhat warm passing thru the always open thermo, will meet the cooling effect of the radiator system and will never have a chance of getting really hot. Not even in summer. It is that simple. In a Caravan I had I solved the problem of lack of heat inside the car changing the heater core, as I told you. Probably in that particular case, the h. core was bad and the thermo was good. The proof is I never had to change the thermo.
But in this case we are talking about I went on and replace the heater core with no success, and it wasn't until I changed the thermo that I got warm air inside and a healthy warm motor now that winter is coming. Thanks again my friend and hope this helps all readers understand this better. The old thermo is now hanging from my rear view mirror, just to always remember and chat about this case.