1. Power Supply Issues:
* Blower Motor Resistor: This is a common culprit. The resistor controls the fan speeds. A faulty resistor can cause the fan to not work at all, or only work on high speed (if at all). It's usually located behind the glove box or under the dash. Inspect it for burnt or broken components.
* Fuse: Check the fuse(s) related to the blower motor in the fuse box (usually under the hood or in the interior fuse panel). A blown fuse indicates a short circuit somewhere in the system.
* Wiring: Inspect the wiring harness leading to the blower motor for any breaks, chafing, or corrosion. A damaged wire can interrupt the power flow.
* Switch: The blower motor switch itself could be faulty. Try tapping on it gently while someone tries the fan switch. This is sometimes a temporary fix to determine if it's the culprit, but it needs to be replaced if this works.
* Relay: Some models use a relay to control the blower motor. A faulty relay can prevent the motor from receiving power. You can usually find relay diagrams in your owner's manual or online.
2. Blower Motor Issues:
* Motor Itself: The blower motor might be worn out, seized up, or have a burnt-out winding. This is the least likely to be a first-problem but needs to be checked if everything else seems to be working. You might hear a clicking or humming sound if it's partially working.
* Motor Connections: Ensure that the connections at the motor itself are clean, tight, and undamaged. Corrosion can prevent good electrical contact.
Troubleshooting Steps:
1. Start with the easiest: Check the fuses first. This is the quickest and cheapest check.
2. Visual Inspection: Carefully inspect the wiring and resistor for any obvious damage.
3. Test the Switch: Try the switch to verify that it is working.
4. Use a Multimeter: A multimeter can help test the power supply to the motor, the resistor, and the switch to identify the point of failure in the circuit.
5. Check the Blower Motor: With the power disconnected, you can sometimes manually try to spin the blower motor. If it's seized, it needs replacing.
If you're not comfortable working with car electrical systems, it's best to take your Delta 88 to a qualified mechanic for diagnosis and repair. Improperly working with car electrical systems can be dangerous.
