Running hot no heat

Tiny
STACEY BOWMAN
  • MEMBER
  • 1999 LINCOLN CONTINENTAL
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
Replace water pump replaced thermostat and cap had radiator flush by a shop only gets hot on one side of heater core hose.
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Monday, November 12th, 2018 AT 10:03 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi and thanks for using 2CarPros. Com.

The running hot is a concern. It could be a partially plugged radiator. I see many of the parts were already replaced. You could even have air in the system.

As far as the heater, if only the supply hose to the core is hot, it sounds like the core is plugged. What to do is remove the hoses at the firewall. Using a garden hose, see if you can get water to flow through the core in both directions. If you can, then both hoses should be getting hot.

If after you do this, you find both are hot but you still have no heat, suspect the blend air door actuator. On this vehicle, it is controlled by the power control module and may have failed. Directions for replacing one are included in the following directions. All attached pictures correlate with these directions.

If you can not get water to flow through the heater core in both directions, the core is plugged and needs replaced. Here are the directions for replacement.

All pictures correlate with these directions.

Procedures
Vehicle Heating and Air Conditioning Heater Core Service and Repair Procedures
PROCEDURES
REMOVAL
1. Remove the instrument panel.
2. Drain the coolant from the radiator so that the coolant level is below the heater core.
3. Loosen the screw and disconnect the electrical connector from the Powertrain Control Module (PCM).
4. Disconnect the heater water hoses from the heater core.
5. Remove the screws and the metal cover.
6. Remove the A/C electronic blend door actuator.
- Disconnect the wire harness connector.
- Remove the screws and remove the A/C electronic blend door actuator.
7. Remove the A/C air intake flue damper assist spring.
8. Depress the locking ramp and remove the A/C damper door shaft from the air temperature control door shaft.

CAUTION: Do not attempt to bend any part of the A/C damper door shaft. It is brittle and will break.
9. Remove the A/C evaporator case outlet door shaft.

CAUTION: Do not attempt to bend any part of the lever. It is brittle and will break.
10. Remove the screws and the heater core cover.

11. Remove the heater core cover seal.
12. Remove the heater core.

INSTALLATION

1. Follow the removal procedure in reverse order.
- Lubricate the heater water hoses with Rubber Suspension Insulator Lube E25Y-19553-A or equivalent meeting Ford specification ESF-M99B112-A.

_____________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Monday, November 12th, 2018 AT 6:23 PM

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