How to remove and clean the coolant expansion tank on Mercury Mountaineer?

Drain the cooling system. Disconnect the reservoir hoses by removing the spring clamps from the reservoir hoses and carefully twisting the coolant hoses off the reservoir. Plug the hose to prevent leakage. On 2006 and later models, the coolant reservoir is mounted on top of the radiator. Remove the reservoir mounting bolts and lift the reservoir out of the engine compartment. Clean out the reservoir with soapy water and a brush to remove any deposits inside. Inspect the reservoir carefully for cracks. If you find a crack, replace the reservoir. Installation is the reverse of removal.

Genuine Mercury Mountaineer Coolant Reservoir

Coolant Tank Reservoir

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5 Coolant Reservoirs found

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Mercury Mountaineer Tank Assembly - Radiator
Part Number: 8L2Z-8A080-A
- Other Name: Tank Assy - Radiator Overflow
- Replaced by: 8L2Z-8A080-B
$309.10 MSRP: $455.90
You Save: $146.80 (33%)

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Fits the following Vehicles:
2008-2010 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Tank Assembly - Radiator
Part Number: 6L2Z-8A080-C
- Other Name: Tank Assy - Radiator Overflow
- Replaced by: 8L2Z-8A080-B
$309.10 MSRP: $455.90
You Save: $146.80 (33%)

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Fits the following Vehicles:
2006-2008 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Reservoir Water
Part Number: F1TZ17618A
- Other Name: Reservoir - Water; Reservoir
$15.98 MSRP: $22.20
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Fits the following Vehicles:
1997-2001 Mercury Mountaineer | 6 Cyl 4.0L, 8 Cyl 5.0L | 4AT 4R70W, 5AT 5R55E
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Mercury Mountaineer Tank Assembly - Radiator Overflow
Part Number: 6L2Z-8A080-B
- Other Name: Tank Assy - Radiator Overflow
- Replaced by: 8L2Z-8A080-B
$309.10 MSRP: $455.90
You Save: $146.80 (33%)

Add to Cart
More Info
Fits the following Vehicles:
2006 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Tank Assembly - Radiator Overflow
Part Number: 3L2Z-8A080-AA
- Other Name: Reservoir
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Fits the following Vehicles:
2002-2005 Mercury Mountaineer | 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L Romeo SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Mountaineer Coolant Reservoir Parts Questions & Answers

Tank Assembly - Radiator
8L2Z-8A080-A
Q: How to remove and clean the coolant expansion tank on Mercury Mountaineer?
A: Drain the cooling system. Disconnect the reservoir hoses by removing the spring clamps from the reservoir hoses and carefully twisting the coolant hoses off the reservoir. Plug the hose to prevent leakage. On 2006 and later models, the coolant reservoir is mounted on top of the Radiator. Remove the reservoir mounting bolts and lift the reservoir out of the engine compartment. Clean out the reservoir with soapy water and a brush to remove any deposits inside. Inspect the reservoir carefully for cracks. If you find a crack, replace the reservoir. Installation is the reverse of removal.