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Remove both upper and lower radiator hoses and run your garden hose water through from the top opening.
On a 2002 Mercury Cougar : No , the thread on cap on your engine coolant reservoir is the pressure cap / radiator cap
Should be in a removable housing at the engine end of the upper radiator hose
yes
In North America the last model year for the Mercury Cougar was 2002
On a 2002 Mercury Sable the radiator is at the front of the engine compartment
A 2002 Mercury Cougar 2.5 liter plug wire diagram can be purchased from your local Mercury Cougar. It can also be found at most auto parts stores.
Yes
2002
R134a
ECM reset for 2002 merc couger
What is a PO420 in a 2002 mercury cougar: Now if your car is 2.0L DOHC. OBD ll PO420 : Catalyst Efficiency Below Threshold (BANK 1). Hope this helps...