Mercury Cougar heater blower only works on high.

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A/C & Heater Controls for Mercury ' eBay

did you check the fuse?

Did you try new bulbs? Next check your dimmer switch on column

You have two other components that control the blower, the control switch and the blower resistor block. The switch is the knob you turn to select the speed and will cause you loose power to the next component that is the resistor block. This part is usually next to the blower motor because it needs to be cooled by the fan and it is responsible for the different fan speeds. Either component can cause a total loss of the blower fan. Go to a online parts lookup like autozone.com and it will show you a picture of the parts so you can identify them.

Remove column cover screws to get to it. http://www.autozone.com/autozone/parts/Duralast-Turn-Signal-Switch/1999-Mercury-Cougar/_/N-jd37uZ9cinv?counter=0&itemIdentifier=223119_0_0_

If it has power you need to confirm if it has a good ground. If it does it may be a defective motor. If not it may just need a blower resistor or have a wiring problem.

Make sure you contact a Mercury Dealer or Ford Dealer and run your vehicle ID number to see if it has a recall on the blower switch. I worked for Ford for years and I think I remember that vehicle having a blower switch and or relay recall. Some of these recalls did not expire and if that is the case it would not cost you anything to have this done. Good luck, hope this helped

SECTION 412-04: Control Components 1999 Cougar Workshop Manual REMOVAL AND INSTALLATION Blower Motor Resistor Removal

1. Remove the upper footwell trim panel (passenger side).
   • Remove the pushpins.

1. Disconnect the blower motor resistor electrical connector.

1. Remove the blower motor resistor.

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you may have to reprogram pcm. there is a TSB on this. call dealer to confirm

I had this exact problem, it is probably your Blower Motor Resistor. It is located under/behind your glovebox, one screw holds it in. Not too expensive either. If that doesn't work it may be your blower motor. Good Luck!