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Here are a few things you can check to see why the horn, fan, and defroster in your 1986 Isuzu Trooper are not working:
Check the relays: The relays may be faulty. To check the relays, disconnect the wiring from the relays and test them with a multimeter. If the relays are faulty, replace them with new relays.
Check the wiring: The wiring may be damaged or corroded. Inspect the wiring carefully for any signs of damage. If you find any damage, repair or replace the wiring.
Check the fuse: The fuse may be blown. Check the fuse box for a blown fuse that is labeled "horn," "fan," or "defroster." If the fuse is blown, replace it with a new fuse of the same amperage.
Check the alternator: The alternator may not be charging the battery properly. This can cause the electrical system to malfunction. Have the alternator tested to see if it is working properly.
Check the ground wires: The ground wires may be loose or corroded. This can cause electrical problems. Inspect the ground wires carefully for any signs of damage. If you find any damage, repair or replace the ground wires.
If you have checked all of these things and the horn, fan, and defroster are still not working, you may need to take the Trooper to a qualified mechanic for further diagnosis and repair.
In the meantime, you can use the Trooper for very short distances, but you should avoid using the horn, fan, or defroster. This will help to prevent further damage to the electrical system.
Most often caused by a bad fan relay. This is a complicated system. Read the post below and download the GM wiring diagrams. Then check the fuses and relays. All 3 relays must be in perfect working order for the system to work properly. Car overheats Ricks Free Auto Repair Advice
Power goes thru the rear blower relay, then the resistor and motor. The fan control switch provides the ground connection. I would check the rear blower relay if power is questioned at the blower motor.
could be fuel filter causing the miss and if fan will not kick off the heat sensor relay has failed and needs to be replaced.....good luck and if this info is a help then please rate my post......
It is common for some relay positions to not be used on many cars. These are places for relays that control things that your vehicle is not equipped with. For example, if your vehicle is not equipped with fog lamps, the spot where the fog lamp relay would go will be empty and there will be no connectors in that spot either.
As for your overheating problem, it needs to be properly diagnosed. Most Dodge engines are VERY unforgiving when it comes to being overheated. Even if it was not caused by a blown head gasket, there is a really good chance that it has one now.
Combustion gasses in your cooling system can keep your fans from running, because the gasses push the water down and away from the Engine Coolant Temperature (ECT) sensor that tells the Powertrain Control Module (PCM) when to operate the fans.
Your Avenger is actually equipped with four different fan control relays. It is very unlikely that all of the relays would be bad (or missing).
Is this the ac fan or cooling fan? For the cooling fan, check relay in the fuse box. The relay could be stuff and if the relay is ok then check the water sensor. The sensor should be on the radiator.
CHECK COOLANT LEVEL TO MAKE SURE NOT LOW.IF ALL LOOKS GOOD.CRANK ENGINE LET IDLE FEW MINUTES TURN ON AC MAX LEVEL TO SEE IF COOLANT FANS COMING ON.IF NO CHECK COOLANT FANS FUSE AND RELAYS.IF COOLANTS FANS COME ON WHILE ENGINE OVERHEATING THERMOSTAT BAD.IF ENGINE OVERHEATING FANS NOT COMING ON YOUR COOLANT TEMPERATURE SENSOR FAULTY.
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