Thermostat not opening

Asked by William Mar 01, 2023 at 08:39 PM about the 2000 Ford F-150 XLT 4WD Extended Cab Stepside SB

Question type: Maintenance & Repair

Old thermostat wasn’t opening causing the engine
to overheat, I purchased the same exact motorcraft
part for it and it’s still is not opening until the truck
pressurizes the coolant and the thermostat finally
opens and shoots coolant through the reservoir cap

1 Answer

1,970

Elevate nose of truck drive on ramps or something to add height, add to proper fill point, turn heat to hot start truck watching coolant tank, w cap off let run for 10-12 mins check vents to see if you have heat,if heat is present, too off coolant to proper fill level and watch for bubbles that are continuously occurring AFTER youve filled system. No bubbles good, lots of bubbles when running bad if tank "pukes" coolant out when thermostat opens you have exhaust gasses being introduced to cooling system. Usually indicating a head gasket/cracked head issue. Cracked head is usually occurs when engine shuts down on is own. Tritons can be fixed depending on your skill set some special tools are required to set up timing.

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