Isuzu — Operating test of thermostat
Testing & diagnosis
From a Isuzu service manual — check it applies to your exact model before use.
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Procedure
- Completely submerge the thermostat in water
- Heat the water, stirring constantly
- Check thermostat initial opening temperature
- Check thermostat full opening temperature
- Check valve lift at fully open position
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Initial opening 85 °C (185 °F)
- Full opening 100 °C (212 °F)
- Valve lift 10 mm (0.39 in)
Source: Isuzu service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.