If I understand this right, there were 2 original problems. 1-no heat, 2- engine not warming up. Now the new problem is overheating, correct? Overheating is usually a function of poor circulation or poor heat transfer, assuming the coolant level is at proper point. 1) Sticking thermostat - if open, no heat and poor engine warmup. if closed, no flow and overheating. 2) Radiator fins degrading and beginning to rust/corrode or come apart. This will compromise the rads ability to do heat transfer and the result will be overheating. Copper rads are famous for this, aluminum less so. 3) If the impeller on the water pump has become worn down, it will be less and less efficient at moving the coolant around in the motor. This will usually give overheating. 4) Last item is big problem - if there is a leak at a head gasket allowing combustion pressure to leak into the cooling system - this will cause overheating problems. Note: No heat if all else is good usually means a plugged heater core. Also, watch out for a slight drop in the coolant level in the rad tank as the pick off point for heater hoses can end up below this level and suddenly you have no flow thru the heater core.
A tune up usually solves the problem. We've had the same problems with a Chevy Suburban and a Ford Taurus. The spark plugs were replaced, some stock parts in the Ford were also replaced, but ultimately certain parts in the engine needed to be flushed and cleaned. Also, the vehicle may be overheating. Check the radiator / Cooling system is working properly.
3 weeks ago you found the upper radiator hose almost completely squeezed in on itself so you replaced the thermostat and upper hose!Also, the cooling system has been flushed and refilled and the cap has been replaced! Could be a partially plugged radiator. Flushing will not always take care of this. I would check the thermostat in a pot of water and thermometer prior to install. I have installed faulty new thermostats. Fool me once shame on you, fool me twice shame on me. thermostat in upside down ? spring should be in the block dying fuel pump
Thermostat possibly installed upside down. Also a possible clogged radiator. we have had the same problems. replaced water pump thermo 3 times flushed sys twice repaired radiator,replaced hoses even left thermo out and still overheating help me too PLEASE!!!!! If you replaced the head gasket, it may not be installed in properly. I.E. coolant passages blocked by gasket. Could be air locked. I had this problem with a 1995 Grand Am. Get yourself a repair manual and follow the entire procedure to bleed all air in the cooling system. Some vehicles have a bleeder valve between the water pump and thermostat housing.
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