Subaru ff-1/1300/1400/1600/1800/Brat 1970-1984 Repair Guide

Thermostat

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REMOVAL & INSTALLATION




CAUTION
DO NOT perform this operation on a hot engine. Depress the button on the radiator cap to relieve the pressure in the cooling system.



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Fig. Fig. 1 After the bolts are removed, pull the housing from the intake manifold



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Fig. Fig. 2 When removing the thermostat, note which direction it was installed



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Fig. Fig. 3 Clean the gasket mounting surfaces thoroughly

The thermostat is located on the top of the intake manifold, at the right side of the engine.

  1. If necessary, remove the spare tire to gain working clearance.
  2.  
  3. Position a clean drain pan under the radiator, remove the drain plug and the radiator cap, then drain the cooling system to a level below the thermostat.
  4.  
  5. If necessary, remove the air cleaner assembly, with it's hoses, brackets and wing nut.
  6.  
  7. Remove the thermostat housing-to-intake manifold bolts, lift the cover and discard the gasket.
  8.  
  9. Remove the thermostat; be sure to note it's mounting position.
  10.  
  11. Using a putty knife, clean the gasket mounting surfaces. Check and/or replace the thermostat (if necessary).
  12.  

To install:

  1. Install a new gasket, using sealant (if necessary) and the thermostat.
  2.  


WARNING
Be sure that the thermostat is installed with the spring/wax pellet facing downward; MAKE SURE that the jiggle valve is facing upwards.

  1. Install the housing and fasten the housing-to-intake manifold bolts.
  2.  
  3. If removed install the air cleaner assembly, hoses, brackets, and wing nut.
  4.  
  5. Refill the cooling system and check for leaks.
  6.  

 
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