It's possible that your fuel pump is getting ready to quit. It's working hard to push fuel to the engine and the circuit is overheating. Might be doing the same thing with a partially plugged fuel filter. Have both checked.
probably the fuel pump?
Does the engine heat up fully?
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relay R1 is for the fuel pump on a 1999 Mercury Cougar
can anyone tell me where to find the OBD2 plug in on a 1999 cougar?
Yes , the 1999 Mercury Cougar is FRONT wheel drive
It's a bit buried. Note that the 1999 Mercury Cougar has no user-servicable barts.
No.
According to the 1999 Mercury Cougar Owner Guide : ( 58.5 litres / 15.4 U.S. gallons )
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The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
You will need to replace the rear expansion block valve and the recharge the system with freon and oil..............