Ford — Thermostat Operation Check
Testing & diagnosis · Water thermostat
From a Ford service manual — check it applies to your exact model before use.
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Procedure
- Visually check the valve to be sure it is air tight.
- Place the thermostat and a thermometer in water.
- Gradually increase the water temperature and observe the opening.
Tools required
- Thermometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Replace thermostat if it does not open at least 0.23 in after one minute at 212°F
- Initial opening 180°F (82°C); full-open 199-204 FridayParts $395.10°F (93-96°C); full-open lift 0.33 in
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.