The compass and cruise control first started to work only intermittently and now dont work at all. Now the fan for the heating and air cond also stopped working

Fuses are a great place to start, if not fuses the actual cruise control switch may be to fault. Rear heater do you get heat out the front and if so is there a fuse for a rear fan maybe a blower.. Let me know

one possibility either the cruise control is on the same circuit line with the heater/defroster fan and same fuse. try to solve the problem with the fan and you will notice the difference.

Go to this site and see if the owners manual is available for what ever you have, you gave no model or year to look this up.

The radio and a/c are on two different circuits other than both being powered thru the key switch. But they both share the same ground connections.
Its possible the two problems are not connected.
I would check the ground circuits for the radio and the blower motor. You may need a shop manual to find the wiring diagrams you will need.
On import cars, the blower motor speed is usually controlled by a resistor in the ground circuit. So if that ground is not good, the fan will run thru the relay but not thru the resistor. The high blower relay bypasses the resistor.

2005-2009 Toyota Tacoma Overhead Console Fuse test
* does your cruise control work?
* do you brake lights work?
* does your dome light work?
The 10 amp IGI #2 fuse controls several other components including the dome light, cruise control, and
brake lights. If these are working but the compass is dim, intermittent, or dead then the control module
has gone bad.
This is a very common problem with the 05-09 Tacoma. The console is very prone to internal failure. I offer a reasonable repair service with a lifetime guarantee, check it out: www.autoclockrepair.com
There is a bunch of useful info there. Drop me an email if you have questions, thanks!

cruise control operation is reliant on the following
road speed sensor ( speedo or VSS sensor )
engine rpms tacho/ ignition coil/module problem
clutch pedal sensor (VSS in automatic )
gear selection position sensor ( not properly adjusted causing flickering of the selector light)
brake pedal sensor
bad ground wire connections
r all need to work together or the CC will stop working
nothing to do with vents and all that you mentioned.
wire connections and harness connections for the transmission are suspect
CC will not operate under certain engine rpms and road speed

The 10 amp IGI #2 fuse controls several other components including the dome light, cruise control, and brake lights. If these are working but the compass is dim, intermittent, or dead then the control module has gone bad. You can get a replacement from toyota but I believe it costs $500+.
I offer a repair service with a lifetime warranty. Check it out:
www.autoclockrepair.com
thanks!

does your cruise control work??? I had no heat or a/c intermittent, and cruise did not work. I replaced the ignition switch (behind the key) and everything works fine now. Switch was 80 dollars and about 2.5 hours of work... the shop wanted 450 dollars.

The 10 amp IGI #2 fuse controls several other components including the dome light, cruise control, and brake lights. If these are working but the compass is dim, intermittent, or dead then the control module has gone bad. You can get a replacement from toyota but I believe it costs $500+.
I offer a repair service with a lifetime warranty. Check it out:
www.autoclockrepair.com
thanks!

check the cooling fan relay located (hidden, hidden, hidden) under the air filter assambly mounted with 2 screws on the chasis of the car.