Here's a breakdown of how to troubleshoot and potential solutions:
1. Check the Blower Motor Switch:
* Visual Inspection: Remove the switch (usually located in the dashboard near the climate controls). Look for any signs of burning, corrosion, or loose wires. A faulty switch can sometimes cause the blower to remain energized even when off.
* Testing (Advanced): You'll need a multimeter to test the continuity and voltage of the switch in different positions. This requires some electrical knowledge. A wiring diagram would be helpful here (see below).
2. Inspect the Blower Motor Resistor:
* Location: The resistor is usually located behind the glove compartment or under the dash, often near the blower motor itself. It's a small heat sink-like component.
* Visual Inspection: Check for any signs of burning, melting, or other damage. A failed resistor can cause the blower to run at full speed continuously, even if the switch is off. It's a common culprit in this problem.
* Replacement: Replacing the blower motor resistor is a relatively inexpensive and straightforward repair.
3. Wiring Issues:
* Loose Connections: Check all wiring connections related to the blower motor, switch, and resistor. Look for corroded or loose connections. A poor connection might be providing a constant, unintended power source to the blower motor.
* Shorted Wires: A short circuit in the wiring harness can also cause this issue. This is less common but possible. Tracing the wiring harness may be necessary.
4. Getting a Wiring Diagram:
Unfortunately, finding a free, high-quality wiring diagram online for a 1995 Jeep Grand Cherokee can be challenging. Your best bets are:
* Repair Manual: A Haynes or Chilton repair manual for your specific year and model Jeep Grand Cherokee will have detailed wiring diagrams.
* Online Automotive Repair Databases (Subscription): Sites like AllDataDIY or Mitchell 1 offer comprehensive repair information, including wiring diagrams, but typically require a paid subscription.
* Jeep Forums: Search online Jeep Grand Cherokee forums (like JeepForum.com or others). Someone may have experienced the same problem and posted relevant information or even diagrams.
Important Safety Note: Before working on any electrical components in your vehicle, disconnect the negative terminal of your battery to prevent accidental shorts and shocks.
In short: Focus your efforts on the blower motor resistor and switch first. They are the most likely culprits. If you're not comfortable working with car electrical systems, taking it to a mechanic is advisable. They have the tools and expertise to diagnose the problem quickly and efficiently.
