Vehicle 2002 Ford Escape XLT 3.0L 6Cyl

Troubleshooting completed:

  • Replaced thermostat and housing
  • Coolant Flushed twice
  • Bypassed heater core, using 3/4" brass coupling
  • Replaced Reservoir
  • Sensor

Parts not replaced:

  • Radiator
  • Water Pump (This is enroute, when it arrives, I will replace it)


  • When coolant was flushed, dark, dark-green fluid including debris came out
  • Fluid is crystal clear now
  • All hoses, besides the heater core hoses, get hot
  • Bottom radiator hose is cold, can squeeze and feel the pressure in this hose, not sure if blockage is before the hose (radiator) or after (passed thermostat)
  • Pressure builds up in reservoir, causes whistling from overflow tube near reservoir spring-loaded cap
  • Reservoir tank is a degas tank, there are no bleed valves
  • The heater core output hose leads to the bottom of the engine, this hose is cold
  • Steam coming off engine beneath intake-manifold, potential leak from build-up of pressure, cannot identify it
  • Fans kick on high 15 minutes after car has been turned on
  • Fans are electric powered
  • Radiator aluminum, extremely hot

I this point I have tried degassing the coolant system with internal AC on high, this was prior to bypassing the heater core, but cold air came out of both hot and cold settings. My guess that my heater core had blockage, and the same, may result somewhere else.

When I flushed the radiator fluid, I pulled the drain plug from the radiator, I pulled the bottom reservoir hose off and attached a hose to it, turned the hose on high and water was coming out of the drain plug at high rate of speed.

  • Welcome to Motor Vehicle Maintenance & Repair! Nov 28, 2018 at 23:37
  • Hello, ty! I have tried other forums, but haven;t received any responses to my inquiry =\
    – herboren
    Nov 28, 2018 at 23:48
  • Two more things to consider, the coolant temperature sensor could be defective causing it to over heat - maybe, or it could be that the water pump isn't pushing the coolant through the engine
    – user38183
    Nov 29, 2018 at 4:52
  • I don't quite understand, can you help me. You said that you bypassed the heater core, then later you said no heat is coming out, one the job of the heater core is to blow out warm air in the cabin and two when the ac is on max it'll always blow out cold :)
    – user38183
    Nov 29, 2018 at 4:55
  • Yeah sorry, all that was done priority to bypassing the heater core. In fact I bypass the heater core yesterday, I went to Home Depot and bought three quarter inch brass coupling. I wanted to CF bypassing the heater core would alleviate the issue, but it has not. I also forgot to mention that the sensor has been replaced, I ordered the sensor the water pump and the reservoir all off rockauto.com
    – herboren
    Nov 29, 2018 at 17:43


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