why does my Ford Explorer Fifth Generation (2011-2019) coolant smell sweet

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

521 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn to diagnose and fix coolant leaks in Ford Explorer (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Cooling System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Allow the engine to cool completely before opening the cooling system.
•Wear safety glasses and gloves when handling coolant, as it is toxic.

Symptoms

•Sweet odor coming from the engine compartment
•Low coolant levels in the reservoir
•Overheating engine
•Visible coolant leaks under the vehicle
•White smoke from the exhaust
•Engine misfires or rough running

Diagnostic Steps

1
Inspect coolant levels by checking the coolant reservoir and radiator for low levels.
2
Perform a visual inspection for any visible leaks around hoses, the radiator, and engine gaskets.
3
Conduct a cooling system pressure test to identify leaks.
4
Check for exhaust gases in the coolant using a combustion leak tester.
5
Inspect the engine oil for signs of coolant contamination (milky appearance).
6
Scan for diagnostic trouble codes (DTCs) using an OBD-II scanner.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Coolant pressure tester
•Socket set
•Torque wrench
•Drain pan

Parts Required

•Replacement hoses (if damaged)
•Radiator (if leaking)
•Head gasket (if blown)

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Diagnostic Steps

1
Inspect coolant levels by checking the coolant reservoir and radiator for low levels.
2
Perform a visual inspection for any visible leaks around hoses, the radiator, and engine gaskets.
3
Conduct a cooling system pressure test to identify leaks.
4
Check for exhaust gases in the coolant using a combustion leak tester.
5
Inspect the engine oil for signs of coolant contamination (milky appearance).
6
Scan for diagnostic trouble codes (DTCs) using an OBD-II scanner.

Solution

1. Preparation

Tools Required: OBD-II scanner, coolant pressure tester, socket set, torque wrench, drain pan.
Ensure the engine is cool before starting any work. Disconnect the battery to avoid electrical issues.

2. Locate and Repair Leak

Sub-steps:
1. If leaks are detected during the inspection, identify the source (hoses, radiator, water pump, or gaskets).
2. For hose replacements, loosen the clamps and remove the damaged hose. Install the new hose and tighten clamps to manufacturer specifications (usually 15-20 in-lbs).
3. If the radiator is leaking, remove it by unscrewing the mounting bolts and disconnecting the hoses. Install the new radiator and reconnect hoses.
4. For head gasket issues, remove the cylinder head according to the service manual, replace the gasket, and reinstall the head with proper torque settings (typically 25-30 ft-lbs, check service manual for specifics).

3. Refill and Bleed Cooling System

Sub-steps:
1. Refill the cooling system with the recommended coolant type (Ford specifies a 50/50 mix of Motorcraft Premium Antifreeze/Coolant).
2. Start the engine and allow it to reach operating temperature while monitoring the coolant level.
3. Once the thermostat opens, check for air bubbles in the reservoir and continue to add coolant until full.