Here's a general overview, but remember this is *not* a complete guide and should not be used as a sole source of information:
1. Safety First:
* Disconnect the negative battery terminal. This prevents accidental shorts and electrical damage.
* Work in a well-ventilated area. Transmission fluid is messy and has fumes.
* Use jack stands. Never work under a vehicle supported only by a jack.
* Protect your eyes and skin. Transmission fluid is irritating. Wear gloves and safety glasses.
2. Accessing the Transmission Solenoid(s):
* The location of the solenoids varies slightly depending on the specific transmission. Usually, they're located on the transmission's valve body. You'll likely need to partially or fully remove the transmission pan to access them.
* Drain the transmission fluid: This is crucial before removing the pan. Use a drain pan to collect the fluid. Dispose of the fluid properly; it's hazardous waste.
* Remove the transmission pan: This typically involves removing bolts securing the pan to the transmission. Be prepared for some fluid spillage, even after draining.
* Locate the solenoid(s): Once the pan is removed, you'll see the valve body with the solenoids attached. They might be held in place by clips or bolts. Your repair manual will show you exactly where they are.
3. Replacing the Solenoid(s):
* Carefully remove the faulty solenoid(s): Note the orientation and position of any seals or gaskets before removal. Take pictures if it helps.
* Clean the area: Remove any debris or old gasket material from the valve body where the solenoid(s) were located.
* Install the new solenoid(s): Ensure they are seated correctly.
* Replace the gasket(s): Use new gaskets to prevent leaks. Do not reuse old gaskets.
4. Reassembly:
* Replace the transmission pan: Ensure the pan is properly sealed.
* Reinstall the bolts: Torque them to the manufacturer's specifications (found in your repair manual).
* Reconnect the negative battery terminal.
* Refill the transmission with the correct type and amount of fluid. Check your owner's manual for specifications. You might need a special transmission fluid filler tool.
5. Testing:
* Start the engine and check for leaks.
* Test drive the vehicle. Pay close attention to shifting. If problems persist, there might be other issues.
Important Considerations:
* Identifying the Correct Solenoid: There are different types of solenoids (shift solenoid, pressure control solenoid, etc.). Order the correct replacement part(s) based on your vehicle's specifications and the problem you're trying to solve. Using the wrong solenoid will likely not fix the issue and could cause further damage.
* Transmission Fluid: Use only the transmission fluid specified for your vehicle. Using the wrong fluid can damage the transmission.
* Professional Help: If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. Incorrectly performing this repair can lead to significant transmission damage.
This is a simplified overview. Always consult a repair manual specific to your 1999 Chrysler LHS before attempting this repair. Failing to do so could result in damage to your vehicle.
