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How many thermostat gaskets or O rings are required for a 2012 MKZ with a 3.5 liter engine?

bighank1bighank1 Member Posts: 31
edited August 2021 in Lincoln
Want to replace a thermostat on a 2012 MKZ with a 3.5 liter engine. Some sites show 2 gaskets required. Is that correct?
Have replaced many thermostats in Ford, GM, and Chrysler vehicles and have never seen one requiring more than 1 gasket.

If 2 are required where exactly do they go?

Don't want to drain coolant and open up the thermostat housing and be short a gasket.


  • thecardoc3thecardoc3 Member Posts: 5,745
    Two part numbers come up when I search. F1VY-8255-A is the only one I see for the 3.5l and it is an o-ring that seals the housing and the thermostat at the same time. The 3M4Z-8255-A seals the housing on the 2.5l when a seal on the thermostat itself isn't used.
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