Blower motr itermittenly dont work except on high sometimes when turning on blower daytime running lights go out

It's the dimmer switch. Which is called the multifunction switch or turn signal switch. Just because it clicks, doesn't mean the it is working properly. If you click and the high beams come on, then click it again and have no low beams, replace the switch. Daytime running lights are controlled by the Body control module.

with a test light back probe the green wire behind the low beam then if test light on = bulb defect
the blue one is for daytime running lights example : if 1 bulb is burn or open no daytime running lights
p.s. you need to have 2 bulbs the same or it won't work

Good Evening, the blower mainly working on high is normally a blower motor resistor located under the dash in the passenger footwell area a short distance from the blower motor. It is held in with 2 bolts and I would recommend if you replace it that you have a 1/4" swivel socket in between your socket and the extension to do it. Try that I'm sure it will work.
Thanks,
Joey

Replace the blower resistor that is mounted next to the blower motor on the passenger side of the vehicle.
This will restore correct blower operation and I suspect it is also back-feeding voltage resulting in your electrical issues.
Two screws hold the blower resistor into the heater case and it is very easy to replace.
Good luck

Believe it or not, but it was a bad ignition switch. I the switch apart and found about 3 different and one in particular that were burned pretty bad. Must have been the circuit that controls the blower and DRL? Found the solution on another blog. I put a new switch on in about 1.5 hours. I does take a couple special tools, very small female torx sockets. Other than that pretty easy.

There is usually a relay under the hood that controls these. They could be run in a series which would explain your lack of a blower motor also. Good Luck.

replace the blower motor speed control module, that is the only cause of this problem that I know of, and u are about the 20 post for this issue that I have read, it has fixed the other ones..

Dont know whay the blower motor doesnt work, but that age with these cars (I have two 94 Marks) both have had the turn signal switch replaced for problems with hazards not working, wipers not shutting off, etc.
To check your climate control system: Press OFF and FLOOR at the same time, release, then hit AUTO. That will make it self-test. You will get 888 (ok) or an error code (024, 025, or such)

5 volts is not enough to run the blower sound like your blower resister is shorted out and back feeding the system did you check it?

I have the same problem. I've heard the ignition switch harness is shorting out and replacing the ignition switch ($75-$125 part) will fix it. A few torx drivers and sockets are needed to replace it (a 4mm hex socket works for the column covers, but the bolts holding the ignition switch in are even smaller. I have it apart down to where I need a smaller torx socket to continue.)