Nissan 240SX/Altima 1993-1998 Repair Guide

Thermostat

Print

REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5 and 6



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the thermostat and housing assembly-240SX



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the thermostat and housing assembly-Altima



Click image to see an enlarged view

Fig. Fig. 3: Pay special attention to alignment marks (arrow) on the hoses. These marks should usually be pointed straight up



Click image to see an enlarged view

Fig. Fig. 4: The thermostat is located under the coolant outlet housing. The housing is sealed to the engine using liquid gasket



Click image to see an enlarged view

Fig. Fig. 5: The thermostat should be installed with the spring toward the engine and the jiggle valve facing outward



Click image to see an enlarged view

Fig. Fig. 6: The thermostat jiggle valve (top arrow) allows air to purge from the engine when the thermostat is closed. The opening temperature of the thermostat (bottom arrow) is stamped into the thermostat housing


CAUTION
Never open, service or drain the cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container.

  1. Drain and recycle the engine coolant.
  2.  
  3. Remove the radiator hose from the thermostat housing.
  4.  
  5. Remove the bolts that secure the thermostat housing and remove the housing from the engine.
  6.  
  7. Remove the thermostat from the engine.
  8.  

To install:
  1. Throughly clean the gasket mating surfaces.
  2.  
  3. Apply liquid gasket to the thermostat housing, as illustrated. The gasket material should be 0.079-0.28 in. (2.0-3.0mm) wide.
  4.  
  5. Install the thermostat in the housing.
  6.  

Be sure to position the thermostat with the jiggle valve to the top of the housing.

  1. Position the thermostat housing on the engine and tighten the attaching bolts as follows:

    6mm bolts-57-66 inch lbs. (6-8 Nm)
     
    8mm bolts-3-5 ft. lbs. (16-19 Nm)
     

  2.  

  1. Connect the radiator hose to the thermostat housing.
  2.  
  3. Refill and bleed the cooling system.
  4.  
  5. Start the engine and check for leaks.
  6.  

 
label.common.footer.alt.autozoneLogo