2002 Ford Explorer electrical

2002 FORD EXPLORER

THOMAS E. MARGRAFF

MEMBER
3 POSTS

Air Conditioning problem
2002 Ford Explorer Two Wheel Drive Automatic

No a/c blower speeds. disconnected 1 & 2 speed wires from blower switch. Now have high speed. When I turn on headlights then a/c selector switch there's no a/c (blower). I then reverse the action a/c on first then headlights,I have a/c. Also instrument cluster lights go dim to out. Are they 6 volt or 12 volt bulbs.

Jul 17, 2010 at 9:48 AM

KHLOW2008

✓ASE Certified Mechanic
41,814 POSTS

Hi Thomas E. Margraff,

Thank you for the donation.

All bulbs used are 12 volts.

Did you check the charging rate of the alternator?

Jul 17, 2010 at 4:53 PM

THOMAS E. MARGRAFF

MEMBER
3 POSTS

Atenator charge is 14.43 volts

Jul 18, 2010 at 9:19 AM

KHLOW2008

✓ASE Certified Mechanic
41,814 POSTS

Charging rate is correct.
Was it done with the headlights and blower turned on?
Are there any other components that do not seem to work correctly?
Any performance or cranking issues?

Jul 18, 2010 at 1:58 PM

THOMAS E. MARGRAFF

MEMBER
3 POSTS

High speed blower & Headlights on - 14.17 Volts. No other problems I know of. But found a red/blk wire coming out of the microprossessor at main light switch with less than a volt .It feeds the instr. cluster lights an also goes to the audio/climate control switch & the speed control switch. The microposseor is getting 9.35 Volts with low beams on.

Jul 18, 2010 at 4:40 PM

KHLOW2008

✓ASE Certified Mechanic
41,814 POSTS

I sent some files with the diagnostic procedure. Let me know if it is helpful.

Jul 18, 2010 at 5:13 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.