AC only works with fan on setting 1, but not on 2-4.

There are 2-3 sensors that will trigger your electric fan comming on, 1 is usually near thermostats, 1 usually near bottom or on side of radiator, third is on your ac compressor. With car running turn on ac fan should kick on if it does ac sensor is good. Then it will be one of your other 2 sensors

Which transmission does yours have 4T65-E or 4T80-E ?

4T80-E
No Fourth Gear

Checks

Causes

1-2 Shift Solenoid Valve
?€¢
Inoperative
?€¢
Debris
?€¢
Pinched wires

3-4 Shift Valve Bore Plug

Misassembled

4th Band

Burned, slipping, missing

4th Servo Cover

Cracked

4th Servo Pin

Broken, seized

4th Servo Piston

Damaged

4th Servo Seals

Rolled, cut or damaged
4T65-E
Slipping or No Fourth Gear
Slipping or No Fourth Gear Checks
Cause

DEFINITION: A large engine RPM increase is noted in fourth gear, Drive range, with little or no vehicle forward speed increase. First, second, and third gear operation are normal. Shifts into fourth gear are soft or do not occur. Fourth gear ratio is 0.705:1.

Automatic Transmission Fluid Level
Low fluid level

Transmission Main Line Pressure
Low transmission main line pressure

Oil Filter Assembly
• The oil filter assembly (100) is missing, plugged, or damaged.
• The oil filter seal assembly (101) is missing or is damaged.

Control Valve Body Assembly
• The 3-4 shift valve (362) or the 4-3 manual downshift valve (360) is stuck or binding.
• Debris is found in the passages of the control valve body (301) or of the control valve body spacer plate and gasket assembly (396)

Case Cover Assembly
Distortion or damage occurs at the manual valve (404) or at the case cover (401), causing PRN oil leak.

Driven Sprocket Support Assembly
A plugged third clutch oil passage in the driven sprocket support assembly (609)

Fourth Clutch Assembly
• The clutch plates (500-502) are worn, damaged, or misassembled.
• A missing or not seated fourth clutch spring retaining ring (601)
• A damaged spring assembly (602) or piston (603)
• Worn or damaged fourth clutch piston seals (604, 605)

Third Clutch Sprag Assembly
• The sprag (720) was misassembled or backwards on the inner race (661).
• A damaged third clutch sprag assembly (653, 661, 719-721)

look at the blower motor resistor 1 and two are resistored and 3 and four are not its probaly burnt

From left to right, the first relay should be for the fuel pump.
The second is for the ac compressor clutch, third is for the blower motor, and fourth is the radiator fan. You can unplug the third and see if the blower stops to verify.
I can also get you the wire colors if you need them.

broken shifter cable

The blower motor resistor is burned out between the third and fourth tap. The resistor is often mounted on the engine side of the firewall inside a box with a single connector going to it.

Fig. 1: Cylinder head bolt tightening sequence-2.0L SOHC engine





Fig. 2: Cylinder head bolt tightening sequence-2.0L and 2.4L DOHC engines

Tighten the bolts in 4 steps as follows:
a. First: all bolts to 25 ft. lbs. (34 Nm).
b. Second: all bolts to 50 ft. lbs. (68 Nm).
c. Third: all bolts again to 50 ft. lbs. (68 Nm).
d. Fourth: all bolts an additional 1 / 4 turn.

Do not use a torque wrench for the fourth step.

Hope helps (remember to rate and comment this).

The most likely problem is the blower resistor. Its under the dash on the passenger side near the firewall. The wires to the blower lead to it. Most of the time the resistor burn out. Its an easy fix.

If it is coming from under the hood(whine)then the ac compressor is either low on oil,or it is about to go out.Sometimes ac compressors will last a good long time,but sometimes they whine right before they lock up.So look for some ac compressor problems.Have a mechanic check it out,but it will most likely need to be changed out(compressor and components).

Sounds like heater blower motor resister is bad.