Complete Thermostat Housing Repair Kit - 1AEEK00131

Warranty & Shipping
How-To & Tools
Product Reviews
Vehicle Fit

This Complete Thermostat Housing Repair Kit is just what you need to get your Explorer / Mountaineer running great again!


  • Kit includes:
    • Upper Thermostat Housing (Motorcraft) (RH167)
    • Lower Thermostat Housing (Motorcraft) (RH258)
    • 195* Thermostat (F7TZ8575A, F7TZ 8575 A, 2L2Z8575AA, 2L2Z 8575 AA, 1L2Z8575AA, 1L2Z 8575 AA)
    • Coolant Temperature Sensor ( 3L8Z12A648BA, 3L8Z 12A648 BA)
    • Housing Seal (Motorcraft) (W702041S300, W702 041S3 00)
    • Thermostat Gasket (Motorcraft)(1L2Z 8255 AA, 1L2Z8255AA, RG614)
  • Direct replacements
  • Built to strict quality control standards

This complete housing repair kit is a great replacement and offers good cost savings over the individual dealer units.

Item Condition: New

Attention California Customers:

WARNING:  This product can expose you to chemicals including Lead and Lead Compounds, which are known to the State of California to cause cancer, and birth defects or other reproductive harm.  For more information, go to

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Draining the Coolant (1:00)
    • Remove the radiator cap by turning counterclockwise
    • Remove the four 10mm bolts securing the cover underneath the radiator
    • Pull the cover down
    • Have a drain pan ready
    • Open up the plug with a 19mm wrench
    • Let the radiator drain
    • Hand-tighten the plug
  2. step : Removing the Intake Tube (2:39)
    • Remove the Phillips head screws from the throttle body cover
    • Remove the 7mm bolt from the throttle body cover
    • Remove the breather hose from the intake hose
    • Remove the intake hose
  3. step : Removing the Upper Radiator Hose (3:38)
    • Remove the 13mm alternator bolt
    • Move the wiring harness
    • Have a drain pan ready
    • Compress and slide the hose clamp nearest the radiator back
    • Twist off the radiator hose off of the radiator
    • Let the hose drain
    • Compress and slide the second hose clamp back
    • Remove the radiator hose from the water pump
  4. step : Removing the Thermostat (4:41)
    • Remove the three 8mm bolts from the thermostat cover
    • Remove the cover
    • Remove the thermostat
  5. step : Removing the Coolant Temperature Sensor (5:29)
    • Remove the lock clip with a pair of pliers
    • Pry the sensor up with a flat blade screwdriver
    • Disconnect the wiring harness
  6. step : Installing the Coolant Temperature Sensor (7:01)
    • Insert the sensor into place
    • Connect the sensor wiring harness
    • Insert the lock clip to the sensor
  7. step : Installing the Thermostat (7:40)
    • Insert the thermostat into place
    • Press on the cover
    • Tighten the three 8mm bolts to the cover
  8. step : Installing the Upper Radiator Hose (8:36)
    • Tighten the 13mm bolt to the wiring harness bracket on the alternator
    • Connect the radiator hose to the water pump
    • Tighten the clamp to the hose
    • Connect the radiator hose to the radiator
    • Tighten the clamp to the hose
  9. step : Reinstalling the Intake Tube (9:44)
    • Insert the intake tube to the air box and throttle body
    • Tighten the hose clamps with a flat blade screwdriver
    • Reconnect the breather hose
  10. step : Bleeding the System (10:52)
    • Fill the radiator with the appropriate mixture
    • Leave the radiator cap off
    • Leave the funnel in the radiator
    • Place a drain pan beneath the radiator
    • Put the fan on the lowest setting
    • Put the heat on the highest setting
    • Run the vehicle
    • Watch the air bubbles
    • Refill coolant as needed while the vehicle is running
    • Let the coolant reach operating temperature
    • Wait for the coolant level to stop dropping
    • Check for heat to come out of the vents
    • Turn the vehicle off
    • Reinstall the radiator cap
    • Top off the overflow bottle if necessary
    • Test drive the vehicle and monitor the coolant levels

Tools needed for replacement:

    Diagnostic Tools

  • Anti-Freeze Hydrometer

  • General Tools

  • Drain Pan
  • Funnel

  • Pliers, Cutters & misc Wrenches

  • Needle nose pliers

  • Ratchets & Related

  • Swivel
  • Ratchet
  • Torque Wrench
  • Socket Extensions

  • Screwdrivers & Related

  • Phillips Head Screwdriver
  • Flat Blade Screwdriver

  • Sockets - Metric

  • 13mm Socket
  • 7mm Socket

  • Wrenches - Metric

  • 19mm Wrench

There are no reviews for this item.
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
No questions have been asked about this item.
Year Make Model Description
2005-2011Ford Explorer Ford Explorer Complete Thermostat Housing Repair Kit V6 4.0L
2005-2010Mercury Mountaineer Mercury Mountaineer Complete Thermostat Housing Repair Kit V6 4.0L
Part #: 1AEEK00131

Out of Stock

How-to Video:

(14:01 min)