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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (HVAC Climate Control System - General Information & Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test E: Insufficient, Erratic or No Heat >> Pinpoint Test E: Insufficient, Erratic Or No Heat

Pinpoint Test E: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
  1. E1 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • Key in OFF position.
    • Check the engine coolant level when hot and cold.
    • Is the engine coolant at the correct level (hot/cold) as indicated on the engine coolant recovery reservoir? 
    1. YES  : Go to  E3.
    2. NO  : Go to  E2.
  2. E2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS 
    • Pressure test the cooling system for leaks. Refer to ENGINE COOLING .
    • Does the engine cooling system leak? 
    1. YES  : REPAIR the engine coolant leak. TEST the system for normal operation.
    2. NO  : Go to  E3.
  3. E3 CHECK FOR COOLANT FLOW TO THE HEATER CORE 
    • Key in ON position.
    • Run the engine until it reaches normal operating temperature. Select the FLOOR position on the control assembly. Set the temperature control to full warm.
      • Fig 1: Checking Coolant Flow To Heater Core
      GF0001297Courtesy of FORD MOTOR CO.
    • Using a suitable temperature measuring device, check the heater core inlet hose to see if it is hot.
    • Is the heater core inlet hose hot? 
    1. YES  : Go to  E4.
    2. NO  : REFER to ENGINE COOLING to check cooling system function.
  4. E4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE 
      Fig 2: Check Plugged Or Restricted Heater Core
      GF0001298Courtesy of FORD MOTOR CO.
    • Using a suitable temperature measuring device, measure the heater core outlet hose temperature.
    • Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17°C [10-30°F])? 
    1. YES  : Go to Pinpoint Test D  and diagnose for a blend door actuator.
    2. NO  : INSTALL a new heater core. TEST the system for normal operation.
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