Question about 1999 Ford Escort

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Engine overheats when heater pipes connected

If U connect heaterpipes together with a piece of pipe the engine runs at the correct temp. The radiator is new as is water pump,thermostat & heater control valve.The air return pipes from the head & radiator are clear, When heater pipes are connected the block boils,after a few miles, heater in car is hot, temp gauge shows hot,remove cap surge of water level goes down, temp drops to normal on gauge engine fan stops, heater blows cold until U start to drive again. Heater blows hot temp goes up fan cuts in Heater blows cold, remove cap pipes to rad are quite cold compared to heater pipes,tend to think air trapped in heater radiator how do U solve this problem.

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  • Anonymous Mar 29, 2014

    My Sport Trac runs hot but does not overheat. When I turn the heater on the temp guage drops to normal

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I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Posted on Jan 29, 2009

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  2. Properly drain and recover the coolant until the level is below the thermostat.
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zjlimited_1248.jpg

Fig. 1: The thermostat is located in the lower radiator hose on the 2.2L engine (click image for zoom)



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(see Figure 7)

When adding coolant, it is important that you use GM Goodwrench DEX-COOL® (orange colored, silicate free) coolant meeting GM specifications. On these vehicles, if silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner; at 30,000 milee or 24 months.
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zjlimited_1249.jpg

Fig. 7: Thermostat removal and installation-2.3L and 2.4L engines

To install:
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  2. Install the outlet pipe-to-oil pan bolt. Tighten the pipe-to-oil pan bolt to 19 ft. lbs. (26 Nm) and the pipe-to-transaxle bolt to 40 ft. lbs. (54 Nm).
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88761eb.gif


Fig. Fig. 7: Thermostat removal and installation-2.3L and 2.4L engines

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