why is my Ford Explorer Fifth Generation (2011-2019) making a hissing noise

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

536 words

Problem Statement

Learn how to diagnose and fix a hissing noise in Ford Explorer Fifth Generation (2011-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the engine is cool before working to prevent burns.
•Disconnect the battery before working on electrical components.
•Allow the engine to cool before inspecting the cooling system.

Symptoms

•Hissing noise coming from under the hood
•Possible loss of engine power
•Fluctuating engine RPMs
•Check engine light illuminated
•Decreased fuel efficiency
•Increased engine temperature

Diagnostic Steps

1
Scan for error codes using OBD-II scanner to identify any fault codes.
2
Inspect vacuum hoses for cracks, leaks, or disconnections that could cause a hissing sound.
3
Check the intake manifold for vacuum leaks by applying a smoke test or using soapy water to identify escaping air.
4
Examine the throttle body for proper operation and cleanliness, ensuring there are no obstructions.
5
Inspect the cooling system for leaks, particularly near the radiator and hoses, as these can also produce hissing sounds.
6
Listen for sounds while the engine is running to pinpoint the location of the noise.

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
•Vacuum gauge
•Flashlight
•Safety goggles
•Gloves
•Throttle body cleaner
•Socket set

Parts Required

•Vacuum hoses (if damaged)
•Throttle body gasket (if removed)
•Radiator hoses (if leaking)

Related Faults

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner to identify any fault codes.
2
Inspect vacuum hoses for cracks, leaks, or disconnections that could cause a hissing sound.
3
Check the intake manifold for vacuum leaks by applying a smoke test or using soapy water to identify escaping air.
4
Examine the throttle body for proper operation and cleanliness, ensuring there are no obstructions.
5
Inspect the cooling system for leaks, particularly near the radiator and hoses, as these can also produce hissing sounds.
6
Listen for sounds while the engine is running to pinpoint the location of the noise.

Solution

1. Preparation

Tools Required: OBD-II scanner, vacuum gauge, flashlight, safety goggles, gloves.
Safety Warnings: Ensure the engine is cool before working to prevent burns.

2. Inspect Vacuum Hoses

Sub-steps:
1. Open the hood and visually inspect all vacuum hoses connected to the intake manifold and other components.
2. Look for any signs of wear, cracks, or loose connections.
3. Replace any damaged hoses with OEM or equivalent parts, ensuring a snug fit.

3. Test for Vacuum Leaks

Sub-steps:
1. If a vacuum leak is suspected, perform a smoke test by introducing smoke into the intake system.
2. Observe for smoke escaping from any hoses or the intake manifold, indicating a leak.
3. Seal any identified leaks with appropriate sealants or replace faulty components.

4. Throttle Body Inspection

Sub-steps:
1. Disconnect the negative battery terminal.
2. Remove the air intake duct leading to the throttle body.
3. Inspect the throttle body for carbon buildup and clean it with throttle body cleaner.
4. Reassemble the duct and reconnect the battery terminal.

5. Cooling System Check

Sub-steps:
1. Inspect the radiator and hoses for signs of coolant leaks.
2. If leaks are found, replace the faulty hose or radiator as necessary.
3. Refill the cooling system with the appropriate coolant type and bleed any air from the system.