Ford WSG-1068 — Thermostat Test - Thermostat Removed
Testing & diagnosis · Water thermostat
For the Ford WSG-1068, from the Ford service manual.
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Before you start
- USE CAUTION WORKING WITH HOT BOILING WATER AND WEAR APPROPRIATE PROTECTIVE GEAR.
Procedure
- Remove the thermostat and immerse it in boiling water.
- Replace the thermostat if it does not open at least 0.230 inch after one minute at 212°F.
- To check leakage, hold the thermostat up to a lighted background at room temperature; leakage of light all around the valve means replace.
Specs & values
- 0.230 inch opening after one minute at 212°F
Source: Ford 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.