Look at the firewall directly behind the engine. You will see the aluminum AC line projecting out from under the cowl shelf. There is a small black plastic cap on the low side port.
If the blower works on lower speeds then its likely the fuse or wiring or relay. Attached is an 2001 Impala Diagram, couldn't find the Monte online. I assume they are similar.If the relay doesn't pull the switch to the other side then you would never get full speed. (Full speed does not go through resistors normally) If you go to a Library they will let you copy their Chilton's Ref Books for like 25 cents per page. But call first and make sure they have Chilton's or similar book.
Get a used one from auto salvage yard $ 20 bucks . Had same problem on a 02 pontiac grand AM . Try moving the switch handle , lightly ,all direction's to see if they start working again , if they do it's the switch . If not , it's the hazard/ flasher module . There was a recall for the pontiac .
Pontiac Grand Am Recall for turn signal malfunction
The problem could be a few different thing's . Test the circuit with voltage drop would be the way to find the problem . Loaded circuit ,power on. Do you know how to use a DVOM - digital volt ohm meter ? Do you know what a wiring diagram is an how to use one to pin point testing spots in a wiring circuit. . Free wiring diagrams here http://www.bbbind.com/free_tsb.html
watch this video an then test the circuit
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
There is a fuse in the panel under the left side dash called a/c cruise. Not sure that is the problem, but sounds like a common denominator. Your diagrams are availabke on autozone.com.
If the regulator was leaking, the diaphragm may have come apart and may be allowing all fuel to return without building pressure in the rail. Replace the regulator!
Did The OBDII scan of the stored fault history, indicate all of the parts you changed were bad. The TPS (throttle position sensor) is the only sensor that is subject to physical wear and age (2002). A dirty air filter will put the MAF (mass airflow sensor) out of range. Always let the stored fault history be your guide to any repairs to avoid buying parts you don't need. Also be aware of the low oil sensor function, it will disable the ignition if more than a quart low. Always do the cheapest fixes first.
