20 Most Recent 1991 Mercury Cougar Questions & Answers


fuse box is located under hood behind battery

1991 Mercury... | Answered on Feb 21, 2016


Check the a/c oil level. When an A/C continuously turns on and off it is usually low on coolant oil.

1991 Mercury... | Answered on Jan 28, 2015


You most likely have a bad headlight relay or a bad headlight switch.

1991 Mercury... | Answered on Jan 17, 2015


There are plastic gears that get hot and melt in these odometers. Best way to fix is to get a new odometer installed. Changing the gears can be tricky

1991 Mercury... | Answered on Dec 04, 2014


Most cars the thermostat is where the top radiator hose enters the motor. Likely in the top of the engine. There should be two bolts holding it on. Make sure when you replace the thermostat you put it in the right side up. or it won't work.

1991 Mercury... | Answered on Jul 05, 2014


check your fuse box to see if that fuse is blown out

1991 Mercury... | Answered on Feb 20, 2013


probably a brake light fuse

1991 Mercury... | Answered on Feb 01, 2013


Should be in overdrive & converter locked
at 42mph or about-- unless your flooring the gas

Internal Solenoid Problem or Valve Body Dirty

1991 Mercury... | Answered on Jan 23, 2013


Replace the bulb first, if it still does this replace the socket and make sure the ground for the light is clean and tight and that the connectors for the tail lights are fully clipped together.

1991 Mercury... | Answered on Oct 25, 2012


Red = Ignition Yellow = Battery Black = Ground Blue = Remote Common For Amps The Rest Is For Speakers Green And Purple Are For The Rear Speakers White And Brown Are For Front Speakers

1991 Mercury... | Answered on Mar 17, 2012


check the air idle control valve , its located in the air tube that leads to the throttle body of your motor,, also, clean the throttle body with carb cleaner, just remove the air tube leading to the motor,, clean the part that it attaches to on the top of the motor, a few sprays will clean off all the black stuff that accumulates inside of it,, open the flap and clean around that too, wipe the excess out with a clean rag,

1991 Mercury... | Answered on Sep 23, 2011


Check your vacuum brake booster; with the engine off, press firmly on the brake pedal, then start the engine. If the pedal sinks noticeably, the booster is OK. If it doesn't, the drum-like device between the fire wall and the master brake cylinder is bad and should be replaced.
If you can't get a good feel from this action, you should have a specialist check your brake system; this isn't something to ignore.

1991 Mercury... | Answered on Sep 06, 2011


Check the idle air control valve. It is mounted on the side of the throttle body. It acts like a choke on fuel injected engines. Here is a link with some pictures and prices for the 3.8 and 5.0 litre engines....i hope this helps.

1991 Mercury... | Answered on Aug 26, 2011


So you haven't tested anything,as you don't know where to go
to do that !

Yet you want to buy a part for no reason & replace it anyway ?

1991 Mercury... | Answered on Jul 23, 2011

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thermastat located

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