A/C problem, blowing hot air

There is no fuse in slot 9. I've had the fuse panel cover on, so I can confirm there never has been.

I have a 2001 :oops: sorry. 18 is good

I've been doing some research online and think it could be the blower speed controller

Here
Question : What is wrong with my cars heat and air? I have a 2001 Mercury Grand Marquis?
It heats up and cools, but even on high, it just barely blows like it is set on low. I think it might be the blower motor. But not sure. If so, what does it take to fix it? Will it be very expensive? My brother said the whole dash will have to come out to get to it. Is that true? I would appreciate anyones input or suggestions since winter is almost here, and I am freezing when I first start my car. Thanks.

Answer:
The blower motor is under the hood area on the right side, it has 3 bolts holding it in, and wiring on top of it. You could have a blower speed controller stuck, or switch that is bad, but the first thing to do is take the blower motor out and check the cage on it, and then look inside to make sure thatt there isn't anything restricting air as it blows thru the evaporator core, I have seen mice make nests in blower motors and in the case area. It should only take 30 minutes to remove the blower motor, and doesn't really need special tools, a 8mm or 5/16 socket, ratchet and a couple of extensions.

And here

I have been searching the Forums on and fiddling around with the EATC System Blower Motor Controller circuit on our 2001 GM LS for a year trying to solve the (initially) intermittent operation of the Blower for a year. After running with the Blower hot-wired thru a toggle switch for six months (when the intermittent problem went to complete failure)I finally got around to pulling the Controller Board out of the Heater/AC box last week.
On my last search of the Forums I turned-up a note from a fellow who said "[i:3032717cf1]most guys just fix it with a little bit of solder[/i:3032717cf1]" this turned-on a lightbulb for me and today I had a look at the solder-joints where the connector is attached to the Controller Board. Sure enough, I could see that the solder was cracked at one of the big lugs of the connector!
I heated-up the pins at all 5 connector lugs and flowed a little solder into the "gaps" around the pins. When I plugged the Board into the harness I found I have a Blower that once again works under control of the EATC!
Now all I have to do is re-install the Board into the Heater/AC Box - a real tight squeeze. Right now I have it tie-wrapped to something under the hood but the heat sink on the Power Transistor gets REAL HOT - I think the best place in it is back inside that Heater/AC Box.

These are exact discriptions of what I have experienced. Where can I find the blower motor control?

I'm having a hard time getting the ratchet in to get the screws. The plug is in the way on the control. I have a birthday party to go to, I'll be back in a few hours.

Great news. It was the Blower Speed control. I have air again! Thanks for your help.

I have read thru another post in this forum about heater and a/c blower motors that stopped working suddenly.

I have a similar problem with a 2003 Mercury Grand Marquis LSE with climate control (Electronic Automatic Temperature Control or EATC for short). I have checked the obvious including the inside passenger compartment fuses plus the power distribution box underneath the front hood with particular attention to both the blower motor relay and blower motor fuses. I even swapped them out with other working relay and fuses in the power distribution box. I then measured the voltage being applied to the blower motor itself under the hood. It read anywhere from 1 to 6 DC volts or so. I have a similar blower motor layout in a well maintained 1997 Ford Crown Victoria (without EATC) and that voltage reading was 13-14 volts whether the fan speed control was set on low or high. So I'm suspicious of the lower voltage I measured in my Grand Marquis versus my Crown Vic. Why would there be this big difference?

While traveling down the highway yesterday at 50-60 mph with the a/c set to 70 degrees, I could feel cool air coming from the vents in my 2003 Grand Marquis probably because of some of the air being recirculated from the outside to the inside. The faster I went, the more cool air I could feel coming from the vents BUT still the blower motor wasn't working. So the A/C system is working, it just ain't blowing this cool air around the inside of my car!

I read about a EATC module self test today which I performed with NO Diagnostic Trouble Codes (DTC) indicated. I then disassembled the fan speed control switch, cleaned it with a cotton swab and some rubbing alcohol, reassembled everything but still the same result. The heater and a/c is not blowing any warm or cold air whatsoever.

What else am I overlooking? Is it maybe the blower speed controller. And exactly where is it?

I removed the new blower motor and put on the old one, since it wasn't the blower motor. I was going to return the new one and get a refund. Do you think I shoud keep it and use the new one? Does it matter?

I see your point. I'll install the new one. Thanks

I read in another forum where some Ford tech at a local dealer was replacing tons of Ford basic part # 19E624 which seems to be known as the blower speed controller. I took a chance and purchased one and replaced mine; it fixed the problem and now the A/C will blow your hat off!

Let me tell you though that this was an absolutely "miserable" module to replace. It is under the hood sandwiched below the two heater hoses and underneath the vapor mangement valve and secured with two 8 mm screws. What should have been a 10 minute job turned into a 2-3 hour miserable job thanks (once again) to the forward-thinking engineers at Ford Motor Company. I don't know what those automotive engineers were smoking but it must have been damn good!

I did read somewhere that if this blower speed controller needed replacement, that something else (like the blower motor itself) may have been the real culprit. Anyone else have any opinions about this?

Same problem on my 2000mgm-will not blow cold air. Thanks