LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 970 (Climate Control System - General Information And Diagnostics - (Except Hybrid)) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test B: Insufficient, Erratic or No Heat >> Pinpoint Test B: Insufficient, Erratic Or No Heat

Pinpoint Test B: Insufficient, Erratic Or No Heat

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK FOR CORRECT ENGINE COOLANT LEVEL 
    • Key in OFF position.
    • Check the engine coolant level when the engine is hot and cold.
    • Is the engine coolant at the correct level (hot/cold) in the radiator coolant recovery reservoir? 
    1. YES  : Go to  B2.
    2. NO  : Go to  B3.
  2. B2 CHECK FOR HOT WATER TO THE HEATER CORE INLET HOSE 
    WARNING: The heater core hoses will become too hot to handle and may cause serious burns if the system is working correctly.
    • Key in ON position.
    • With the engine running, allow the engine to reach a normal operating temperature.
      • Fig 1: Heater Core Inlet Hose
      GF0025640Courtesy of FORD MOTOR CO.
    • Feel the heater core inlet hose.
    • Is the heater core inlet hose too hot to handle? 
    1. YES  : Go to  B4.
    2. NO  : REFER to ENGINE COOLING article.
  3. B3 CHECK THE COOLANT SYSTEM INCLUDING THE RADIATOR CAP FOR LEAKS 
    • Fill the engine cooling system to the specified level.
    • Pressure check the engine cooling system; refer to ENGINE COOLING article. It is not necessary to check components separately at this time.
    • Does the engine cooling system, including the radiator cap, hold pressure? 
    1. YES  : Go to  B4.
    2. NO  : PRESSURE TEST the heater core. REFER to the component tests. REPAIR as necessary.
  4. B4 CHECK THE HEATER CORE OUTLET HOSE FOR HOT WATER 
    • Key in ON position.
    • With the engine running, allow the engine to reach a normal operating temperature.
      • Fig 2: Heater Core Outlet Hose
      GF0025641Courtesy of FORD MOTOR CO.
    • Feel the heater core outlet hose.
    • Is the heater core outlet hose warm or hot? 
    1. YES  : Go to Pinpoint Test E .
    2. NO  : TEST the heater core for a plugged or partially plugged condition. REFER to the component tests.
scientia non olet · About LEMON Manuals