Honda Accord/Prelude 1984-1995 Repair Guide

Thermostat

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CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container.

REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

  1. With the engine cold, drain the cooling system.
  2.  
  3. Disconnect the radiator hose from the thermostat housing outlet.
  4.  



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Fig. Fig. 1: Use a pair of pliers to compress the spring clamp, then slide it up the hose and disconnect the hose from the housing

  1. Remove the thermostat housing outlet and remove the thermostat.
  2.  



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Fig. Fig. 2: Remove the nuts/bolts securing the thermostat housing ...



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Fig. Fig. 3: ... then remove the thermostat housing



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Fig. Fig. 4: Once the housing is removed, the thermostat can be removed from the engine

  1. Using a putty knife, clean the gasket mounting surfaces.
  2.  

If the thermostat is equipped with a pin valve, be sure to install the thermostat with the pin facing upward.

To install:
  1. Install a new thermostat the gasket, O-ring or sealant (as applicable). Always install the spring end of the thermostat facing the engine.
  2.  
  3. Tighten the thermostat cover-to-thermostat housing bolts to 9 ft. lbs. (12 Nm).
  4.  
  5. Connect the radiator hose to the thermostat housing.
  6.  
  7. Fill, then bleed the cooling system. Check for leaks.
  8.  

 
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