My 1991 Isuzu Rodeo fan switch went out on "1 and 2" settings. Number 3 "blinks" off and on once in a while. The cooling part is okay. Is it a switch or a relay? I had a friend check behind the switch (he removed the ashtray) and check the responder or whatever that is called. Is there a fuse to check or a relay? Or could it be a wire problem? I am hoping it is something simple. Thank you for your time and help.

For the 1991 Isuzu Rodeo with the 3.1L V6:

Firing Order:
1-2-3-4-5-6
Cylinders:
....(back).....'.5...........6.'
'.3...........4.'
'.1...........2.'
....(front)
Distributor:
.....(back)
.................(+)-screw
..........4
..3
...................5
2
.................6
.........1
(+)-screw
.....(front)
Rotation: Clockwise

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For the 1991 Isuzu Rodeo
I do not know if you have the 2.6L SOHC In-Line 4-Cylinder or the 3.1L V6; however I have included both below.

For the 2.6L:
Firing Order:
1-3-4-2
Cylinders:
(back)
...4
...3
...2
...1
(front)
Ignition Coils:
(back)
[///]1....2
[///]3....4
(front)

For the 3.1L:
Firing Order:
1-2-3-4-5-6
Cylinders:
.....(back)
5...............6
3...............4
1...............2
Distributor:
.....(back)
..............(+)-screw
.........4
..3
...................5
2
.................6
........1
(+)-screw
.....(front)
Rotation: Clockwise

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Hello jaymcintosh: My name is Roger and I will help you.The fire order is 1-2-3-4-5-6. I also attached a picture to help you. Should you need further help please just ask. Please rate the answer you received. Thank You using Fix Ya. Roger

Facing towards front of engine-number 1 is on passenger side front cyl of engine. Number 2 is front cyl on driver's side-number 3 middle cyl on passenger side-4 on middle cyl driver's side-5 on back cyl passenger side and 6 on back cyl driver's side. The distributer rotates COUNTER CLOCKWISE-number 1 cyl's sparkplug wire attaches to distributer cap connection closest to number 5 cyl.-to your right side of this plug wire on cap would go cyl number 2-then 3-then 4-then 5 and then 6. The firing order is:1,2,3,4,5,6

if there is no power to the fuel pump check relays and fuses....UNDERHOOD FUSE & RELAY PANEL IDENTIFICATION Fig. 2: Underhood Fuse & Relay Panel Identification Courtesy of ISUZU MOTOR CO. Fusible Link Identification ? A - 80 Amp (1991-92 3.1L) ? A - 60 Amp Main-1 ? B - 30 Amp Main-2 ? C - 30 Amp (1993-94) ECM (3.2L) ? D - 30 Amp Condenser Fan (A/T Models) Relay Identification ? 1 - Headlight Relay ? 2 - A/C - Heater Relay ? 3 - Starter Relay ? 4 - A/C Compressor Relay ? 5 - Charge Relay ? 6 - Fuel Pump Relay ? 7 - ECM Relay ? 8 - Wiper Relay Fuse & Circuit Breaker Identification ? 1 - 15 Amp (1991) ECM, Fuel Injection System ? 1 - 15 Amp (1992-94 2.6L) ECM, Fuel Injection System ? 1 - 10 Amp (1992-94 3.1 & 3.2L) Heated Oxygen Sensor, Fuel Injection System ? 2 - 20 Amp (1991-92) Fuel Pump ? 2 - 20 Amp (1993-94 2.6L) Fuel Pump ? 2 - 15 Amp (1993-94 3.2L) Fuel Pump ? 3 - 10 Amp (1991) ? 3 - 15 Amp (1992-94) Turn Signal Lights, Hazard Warning Flasher Lights ? 4 - 10 Amp Horn, Door Locks ? 5 - Not Used (1991 3.1L) ? 5 - 10 Amp Charging System, Charge Warning Light WARNING: Always disconnect battery ground cable before servicing "high- current fuses. It is recommended that "high-current" fuses be replaced by a qualified technician. Page 1 of 2 FUSES & CIRCUIT BREAKERS -1994 Isuzu Rodeo LS? 6 - Not Used (1991) (1992-93 2.6L) ? 6 - 10 Amp (1992-94 3.1L & 3.2L) A/T Interlock System ? 6 - 10 Amp (1994 2.6L) Heated Oxygen Sensor, Fuel Injection System ? 7 - 20 Amp Heater/Air Conditioning Blower Controls ? 8 - 10 Amp Air Conditioner Compressor Controls ? 9 - 10 Amp Right Headlight ? 10 - 10 Amp Left Headlight © 2008 Mitchell Repair Information Co., LLC.

Underhood fuse block swap out relay #7 thats the ECM relay.
Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location.
Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo

I'm sending you two diagrams because I don't know if you have a 4cyl. or a V6:

I had the same problem and my fluid was fine! First try to bleed it (i went the easy way and bought a speed bleeder) if that doesn't do it i replaced my slave cylinder and it worked.

No. 4 to Top Dead Center is Correct.

try checking out your blower speed control resistors. follow your power wire from blower to the resistors, to locat, should be in duct in front of blower for cooling. I hope this helps, if the resistors pack is good only think else is a bad switch