Hyundai Coupes/Sedans 1986-1993 Repair Guide

Thermo Valve

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The thermo valve is installed into the EGR vacuum supply line and is threaded into the intake manifold. The valve functions as a temperature switch to stop the vacuum signal to the EGR valve.

TESTING



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Thermo valve resistance test-Fuel injected California vehicles

  1. Connect a hand vacuum pump to the thermo valve nipple.
  2.  
  3. Apply a vacuum with a hand vacuum pump.
  4.  
  5. At coolant temperatures below 122°deg;F (50°deg;C), the vacuum should not hold.
  6.  
  7. At coolant temperatures above 176°deg;F (80°deg;C), the vacuum should hold.
  8.  
  9. Replace the thermo valve if not functioning properly.
  10.  

 
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