Ford — Thermostat Test
Testing & diagnosis
From a Ford service manual covering: 140 CID, 2.3 LITRE, 2300 cc, LSG-423. Check it applies to your exact model before use.
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Procedure
- Remove the thermostat and immerse it in boiling water.
- Replace thermostat if it does not open at least 0.230 inch after one minute at 212 degrees F.
- To check for leakage, hold thermostat up to lighted background at room temperature.
- Leakage of light all around the valve indicates thermostat is unacceptable and should be replaced.
Specs & values
- Opens at least 0.230 inch after one minute at 212 degrees 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.