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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 34125
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Heater will not work on a 1996 ford ranger, what can I trouble shoot?

Resolved Question:

Heater will not work on a 1996 ford ranger, what can I trouble shoot?
Submitted: 6 years ago.
Category: Ford
Expert:  Ron replied 6 years ago.

Hello and Welcome to Justanswer,


My name is XXXXX XXXXX I am here to try and assist your with your question.

Listed below are the things you are going to need to check to determine why you heater isnt working. Run thru these steps and let me know if you need further Help.

SYMPTOM CHART - CLIMATE CONTROL SYSTEM, SERVICE
ConditionPossible SourceAction
  • Insufficient, Erratic, or No Heat or Defrost
  • Low radiator coolant level due to coolant leaks.
  • CHECK radiator cap pressure. REPLACE if below minimum pressure as marked on cap. FILL to specified coolant level. PRESSURE TEST for engine cooling system and heater system leaks. SERVICE as required.
  • Engine overheating.
  • CHECK radiator cap. REPLACE if below minimum pressure as marked on cap. REMOVE bugs, leaves, etc. from radiator or condenser fins.

    CHECK for:
  • Loose drive belt
  • Sticking thermostat
  • Incorrect ignition timing
  • Water pump impeller damage
  • Restricted cooling system
  • SERVICE as required. REFER to Group 03.
  • Loose drive belt.
  • REPLACE if cracked or worn and/or ADJUST tension.
  • Thermostat.
  • CHECK coolant temperature at radiator filler neck. If under 170° F, REPLACE thermostat. REFER to Group 03.
  • Plugged or partially plugged heater core.
  • CLEAN and BACKFLUSH engine cooling system and heater core.
  • Loose or improperly adjusted heater temperature cables.
  • ADJUST to specifications.
  • Kinked, clogged, collapsed, soft, swollen, or decomposed engine cooling system or heater system hoses.
  • REPLACE damaged hoses and BACKFLUSH engine cooling system, then heater system, until all particles have been removed.
  • Blocked air inlet.
  • CHECK cowl air inlet for leaves, foreign material, etc. REMOVE as required. CHECK internal blower inlet screen (on vehicles so equipped) for leaves and foreign material.
  • Blower motor.
  • CHECK fuse. CONNECT a No. 10 gauge (or larger diameter) jumper wire directly from the positive battery terminal to the positive lead (orange wire) of the blower motor. If the blower motor runs, the problem must be external to the blower motor. If the blower motor will not run, CONNECT a No. 10 gauge (or larger diameter) jumper wire from the heater blower motor black lead to a good ground. If the blower motor runs, the trouble is in the ground circuit. On vehicles with ground side switching, CHECK the heater blower motor switch resistor, the heater blower motor switch and the harness connections. SERVICE as required. If blower motor still will not run, the blower motor is inoperative and should be replaced.
  • Heater blower motor switch resistor.
  • CHECK continuity of resistors for opens or shorts (self-powered test lamp). SERVICE or REPLACE as required.
  • Wire harness to blower motor.
  • CHECK for proper installation of harness connectors. CHECK wire-to-terminal continuity. CHECK continuity of wires in harness for shorts, opens, abrasions, etc. SERVICE as required. GO to pinpoint test J

Customer: replied 6 years ago.
Have don everything but the back flush. How is that done?
Expert:  Ron replied 6 years ago.
You remove the Heater hoses at the firewall and take a garden hose and force water thru it till you have a nice flow out the outer side.
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