Replacing the radiator in your 2018 Malibu LT 1.5 Turbo is a relatively straightforward process that can be completed in a few hours with the right tools and preparation. By following these step-by-step instructions, you can save yourself time and money while ensuring that your cooling system is functioning properly.
Firstly, it is crucial to gather all the necessary tools and materials. You will need a new radiator, a new radiator cap, a set of wrenches, a set of pliers, a screwdriver, and a bucket. Additionally, various fluids are required, such as coolant, brake fluid, and transmission fluid. Once you have gathered everything, park your car on a level surface and allow the engine to cool down completely. This will prevent any burns or injuries.
Secondly, it is time to remove the old radiator from your vehicle. Start by disconnecting the negative terminal of your battery with a wrench. Next, drain the coolant from the radiator by opening the petcock at the bottom of the radiator. Be sure to place a bucket beneath the petcock to catch the coolant. Once released, disconnect the upper and lower radiator hoses with pliers and remove the radiator from its mounting brackets. Finally, replace the old radiator with the new one and reconnect all of the hoses and the battery terminal.
Determining Radiator Replacement Necessity
The radiator is a crucial component of your 2018 Malibu Lt 1.5 Turbo’s cooling system. It helps dissipate heat from the engine, preventing overheating and damage. Several signs indicate that your radiator may need to be replaced, including:
-
Visible leaks or cracks:
If you notice any visible leaks or cracks in the radiator, it’s a telltale sign that it needs to be replaced.
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Overheating:
If your vehicle is overheating frequently, the radiator may be clogged or damaged, restricting coolant flow and causing the engine to run hotter than normal.
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Coolant loss:
If you notice a drop in coolant levels without any visible leaks, the radiator may have a small leak or crack that allows coolant to escape.
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Sediment or rust:
If you observe sediment or rust in your coolant or on the interior of the radiator, it indicates corrosion that can weaken the radiator and compromise its cooling efficiency.
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Damaged fins:
The radiator fins are responsible for dissipating heat, so if they become bent or damaged, the radiator’s cooling capacity is reduced.
| Symptoms | Possible Causes |
|---|---|
| Visible leaks or cracks | Physical damage, corrosion |
| Overheating | Clogged or damaged radiator, coolant system issues |
| Coolant loss | Small leaks or cracks in the radiator, loose connections |
| Sediment or rust | Corrosion, age-related wear and tear |
| Damaged fins | Impact or collision damage |
Safety Precautions
Before beginning any work on your vehicle, it’s crucial to take the following safety precautions:
- Wear appropriate safety gear, including gloves and eye protection.
- Park your vehicle on a level surface and engage the parking brake.
- Allow the engine to cool completely before proceeding.
- Disconnect the negative terminal of your battery to prevent electrical shocks.
Tools Required
To change the radiator in a 2018 Malibu LT 1.5 Turbo, you will need the following tools:
Essential Tools:
- 10mm socket and wrench
- 13mm socket and wrench
- 15mm socket and wrench
- 19mm socket and wrench
- Phillips screwdriver
- Flathead screwdriver
- Radiator drain pan
- Funnel
- Automotive coolant
Recommended Tools:
- Torque wrench
- Coolant flush kit
- Radiator flush chemical
- Shop towels or rags
| Item | Quantity |
|---|---|
| 10mm socket | 1 |
| 13mm socket | 1 |
| 15mm socket | 1 |
Draining the Coolant
Before you embark on replacing the radiator in your 2018 Malibu LT 1.5 Turbo, it’s crucial to drain the coolant. Here’s a detailed guide to help you accomplish this step safely and effectively:
Materials You’ll Need:
- Coolant drain pan
- 10mm socket wrench
- Funnel
- Coolant drain pan
- 10mm socket wrench
- Funnel
Step-by-Step Instructions:
1. Locate the drain plug: Identify the radiator drain plug, typically located at the bottom of the radiator on the passenger side. It’s often a small, black or silver plug.
2. Place the drain pan: Position the coolant drain pan beneath the radiator to catch the drained fluid.
3. Loosen the drain plug: Using a 10mm socket wrench, carefully loosen the drain plug counterclockwise. Be prepared for a significant amount of coolant to flow out, so it’s essential to keep the drain pan in place and open wide.
4. Drain the coolant: Allow the coolant to drain completely into the drain pan. This may take several minutes. Avoid touching the coolant as it can be hot.
5. Monitor the flow: Keep an eye on the flow of coolant. If it starts to slow down or stop, check if any debris is clogging the drain hole. If necessary, use a small screwdriver or wire to gently remove any obstructions.
6. Tighten the drain plug: Once the coolant has completely drained, hand-tighten the drain plug back into place. Use the socket wrench to further tighten the plug, ensuring a snug fit to prevent leaks.
Disconnecting the Radiator Hoses
Step 1: Locating the Radiator Hoses
Identify the two hoses connected to the radiator at the top and bottom. One hose carries coolant from the engine to the radiator, and the other returns cooled coolant to the engine.
Step 2: Preparing for Removal
Place a drain pan under the radiator to catch any leaking coolant. Cover the engine to protect it from coolant drips.
Step 3: Disconnecting the Upper Hose
Using a pair of pliers or a hose clamp removal tool, carefully loosen the hose clamp holding the upper hose to the radiator. Gently pull the hose off the radiator nipple. If the hose is stuck, you may need to use a flat-head screwdriver to gently pry it loose.
Step 4: Detailed Steps for Disconnecting the Lower Hose
Step 4a: Loosen the Hose Clamp
Locate the hose clamp securing the lower hose to the radiator. Using pliers or a hose clamp removal tool, carefully loosen the clamp but do not remove it completely at this stage.
Step 4b: Place a Drain Pan
Position a drain pan under the lower hose to collect any draining coolant. Ensure the pan is wide enough to accommodate the flow of coolant.
Step 4c: Remove the Clamp and Pull the Hose
Once the hose clamp is loose, gently pull the hose away from the radiator while angling it downward. This will allow the coolant to drain into the pan below.
Step 4d: Drain the Coolant
Allow the coolant to drain completely into the pan. This may take several minutes.
Step 4e: Remove the Hose from the Clamp
Once the coolant has drained, remove the lower hose completely by pulling it off the hose clamp.
Step 4f: Clean the Hose Connections
Using a clean cloth or brush, clean the radiator nipples and the hose ends where the clamp was attached to remove any remaining coolant or debris.
Removing the Old Radiator
Once you have drained the coolant, you can proceed to remove the old radiator. Here are more detailed steps:
1. Disconnect the Hoses
Locate the upper and lower radiator hoses connected to the radiator. Use a socket wrench or pliers to loosen the hose clamps and disconnect the hoses from the radiator.
2. Remove the Top Mount
At the top of the radiator, there is a mount that holds it in place. Use a wrench or socket to remove the bolts securing the mount.
3. Remove the Bottom Bolts
There are two or more bolts at the bottom of the radiator that secure it to the frame. Use a wrench or socket to remove these bolts.
4. Lift Out the Radiator
Once the top mount and bottom bolts are removed, carefully lift the radiator out of its position. Be cautious as the radiator can be heavy and may have residual coolant inside.
5. Clean the Mounting Points and Hoses
Before installing the new radiator, it is essential to clean the mounting points on the frame and the radiator hoses. Use a wire brush or sandpaper to remove any corrosion or debris. Also, check the hoses for any cracks or leaks and replace them if necessary.
| Step | Action |
|---|---|
| 1 | Disconnect the hoses |
| 2 | Remove the top mount |
| 3 | Remove the bottom bolts |
| 4 | Lift out the radiator |
| 5 | Clean the mounting points and hoses |
Installing the New Radiator
With the old radiator removed, it’s time to install the new one. Here’s how to do it:
- Place the new radiator in its mounting brackets and connect the lower hose to the radiator outlet.
- Tighten the lower hose clamp.
- Connect the upper hose to the radiator inlet.
- Tighten the upper hose clamp.
- Fill the radiator with coolant.
Refer to your vehicle’s owner’s manual for the recommended coolant type and capacity.
Replacing the Radiator Hoses
It’s a good idea to replace the radiator hoses when you change the radiator. Here’s how to do it:
- Remove the clamps that secure the old hoses to the radiator.
- Pull the old hoses off the radiator.
- Slide the new hoses onto the radiator.
- Tighten the clamps.
- Fill the radiator with coolant.
Other Components to Check
While you’re changing the radiator, it’s a good time to check other components in the cooling system, such as the:
- Water pump
- Thermostat
- Coolant hoses
- Radiator cap
- Fan belts or electric fans
| Component | Check For |
|---|---|
| Water pump | Leaks, noise, or excessive play |
| Thermostat | Stuck open or closed, causing overheating or undercooling |
| Coolant hoses | Cracks, leaks, or bulging |
| Radiator cap | Proper seal, no leaks |
| Fan belts or electric fans | Proper operation, no slipping or excessive noise |
Reconnecting the Radiator Hoses
Reconnect the Upper Radiator Hose:
- Slide the lower end of the hose onto the radiator inlet.
- Push the hose clamp over the hose and tighten it using a screwdriver or socket wrench.
- Ensure the hose is secure and free of leaks.
Reconnect the Lower Radiator Hose:
- Slide the lower end of the hose onto the water pump outlet.
- Push the other end of the hose onto the radiator outlet.
- Secure both hose clamps to prevent leaks.
Check for Leaks:
Start the engine and let it run for a few minutes. Inspect all hose connections for leaks. If any leaks occur, tighten the hose clamps or replace the hoses as necessary.
Tips:
- Use new hose clamps for a tight and secure connection.
- Inspect the hoses for any damage or cracks before reusing them.
- Lubricate the hose ends with coolant or water to make them easier to slide on.
- If the radiator is significantly damaged, it is recommended to replace it with a new radiator.
Caution:
- Allow the engine to cool down sufficiently before working on the radiator or hoses.
- Radiator fluid is typically a green or pink liquid and can be harmful if ingested. Handle it with care and dispose of it properly.
Filling and Bleeding the Cooling System
Once the new radiator is in place, it’s time to fill and bleed the cooling system. This process involves filling the radiator with coolant and then removing any air bubbles that may have entered the system.
1. Fill the Radiator
To fill the radiator, use an automotive funnel and slowly pour in coolant until the level reaches the top of the radiator. Be sure to use the correct type of coolant specified in your owner’s manual.
2. Close the Radiator Cap
Once the radiator is full, close the radiator cap tightly.
3. Run the Engine
Start the engine and let it run for a few minutes. This will circulate the coolant throughout the system and help remove any air bubbles.
4. Check the Coolant Level
After the engine has run for a few minutes, turn it off and check the coolant level in the radiator. If the level has dropped, add more coolant until it reaches the top of the radiator.
5. Repeat Steps 3 and 4
Repeat steps 3 and 4 until the coolant level no longer drops.
6. Remove the Bleeder Screw
If your vehicle has a bleeder screw, located on the top of the radiator or a connecting coolant hose, open it slightly to allow any remaining air bubbles to escape. Close the bleeder screw once coolant begins to flow out.
7. Check for Leaks
Inspect the entire cooling system for any leaks. Tighten any loose connections or hose clamps as necessary.
8. Drive the Vehicle and Monitor Temperature
Drive the vehicle for a short distance and monitor the engine temperature gauge. If the temperature gauge reads high or if you notice any leaks, stop the vehicle and check the cooling system for any issues.
Additional Tips for Bleeding the Cooling System
| Tip |
|---|
| Use a cooling system funnel specifically designed to fill radiators and bleed air bubbles. |
| Run the vehicle with the heater on high to circulate coolant through the heater core. |
| Accelerate the vehicle to 2,000-3,000 RPM for a few seconds to help dislodge air bubbles. |
Verifying Radiator Function
To verify the proper functioning of your radiator, inspect the temperature gauge on your dashboard. If the needle consistently reads in the red zone, it indicates an issue with the cooling system, potentially the radiator. Additionally, keep an eye out for any steam or coolant leaks from the radiator or hoses.
Coolant Level Check
Check the coolant level in the radiator by opening the radiator cap when the engine is cold. The coolant should be between the “Min” and “Max” marks on the radiator reservoir. If the coolant level is low, add the appropriate coolant to the reservoir.
Thermostat Inspection
A faulty thermostat can impede coolant flow and cause overheating. To check the thermostat, remove it and place it in a pot of hot water. If the thermostat opens fully when immersed in hot water, it is functioning properly. If it remains closed, it needs to be replaced.
Leak Inspection
To inspect the radiator for leaks, thoroughly clean the exterior with a hose or compressed air. Start the engine and let it idle. Look for any visible leaks or drips from the radiator or hoses. You can also use a flashlight to inspect the underside of the radiator for any leaks that may be obscured by the engine.
Pressure Test
For a more comprehensive leak inspection, conduct a pressure test. Rent or borrow a radiator pressure tester from an auto parts store. Attach the tester to the radiator and pump it up to the specified pressure. If the pressure drops over time, it indicates a leak in the radiator or hoses. Inspect all visible areas carefully and tighten or replace any loose or leaking components.
Draining Coolant
Locate the drain plug at the bottom of the radiator and place a drain pan underneath it. Open the plug and allow all of the coolant to drain out. Once the coolant has stopped draining, close the plug.
Removing the Radiator Mounting Bolts
Locate the two mounting bolts that hold the radiator in place. Use a wrench to loosen the bolts, but do not remove them completely. Lift the radiator up and out of the vehicle.
Installing the New Radiator
Position the new radiator in the vehicle and align it with the mounting bolts. Lower the radiator into place and tighten the mounting bolts. Do not overtighten the bolts.
Filling the Radiator with Coolant
Fill the radiator with coolant until the level reaches the “full” mark. Replace the radiator cap and tighten it securely.
Burping the Cooling System
Start the engine and let it idle for 10-15 minutes. As the engine runs, the coolant will circulate through the system and any air bubbles will be released. Once the air bubbles have been released, the coolant level may drop. Add more coolant as needed to bring the level back to the “full” mark.
Resetting Computer Codes
Once you have replaced the radiator, it is important to reset the computer codes. This will clear any codes that may have been triggered by the radiator replacement. To reset the computer codes, simply disconnect the battery for 10-15 minutes. After 10-15 minutes, reconnect the battery and start the engine. The computer codes will now be reset.
Test Drive
After you have reset the computer codes, take the vehicle for a test drive. This will allow you to check for any leaks and ensure that the cooling system is functioning properly. If you notice any leaks or other problems, stop driving the vehicle and have it inspected by a qualified mechanic.
Recommended Tools and Materials
| Tool/Material | Description |
|---|---|
| New radiator | The new radiator that you will be installing. |
| Drain pan | A pan to catch the coolant as you drain it from the radiator. |
| Wrench | A wrench to loosen and tighten the radiator mounting bolts. |
| Coolant | The coolant that you will be filling the radiator with. |
| Funnel | A funnel to help you fill the radiator with coolant. |
