How to drain and clean the coolant reservoir on 2010 Mazda 3?

Empty the cooling system until the coolant reservoir fills up. Take the clamps out of the hoses and disconnect them to the reservoir. Loosen the screw that holds the tank and raise it and unscrew the bottom hose. Wash the reservoir, check for cracks, and replace it if necessary. Install and refill the cooling system.

Genuine 2010 Mazda 3 Coolant Reservoir

Coolant Tank Reservoir

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2 Coolant Reservoirs found

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2010 Mazda 3 Reservoir Part Number: LF8B-15-350B
$59.00 MSRP: $78.68
You Save: $19.68 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Tank, Sub-Radiator; Expansion Tank, Reservoir
- Replaces: LF8B-15-360A, LF50-15-350A, LF50-15-350, LF8B-15-350A, LF50-15-350B, LF8B-15-350, LF8B-15-360, LF50-15-350C, LFR5-15-360
- Item Weight: 2.60 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: LF8B-15-350B
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
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Fits the following 2010 Mazda 3 Submodels:
- i, Mazdaspeed, S, SP23 | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
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2010 Mazda 3 Expansion Tank Part Number: L3CE-15-350A
$81.11 MSRP: $108.17
You Save: $27.06 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Tank, Sub-Radiator; Expansion Tank
- Replaces: L3CE-15-350, L512-15-350, L512-15-350A
- Item Weight: 1.50 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: L3CE-15-350A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 2010 Mazda 3 Submodels:
- i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS

2010 Mazda 3 Coolant Reservoir Parts and Q&A

Q: How to drain and clean the coolant reservoir on 2010 Mazda 3?
A: Empty the cooling system until the coolant reservoir fills up. Take the clamps out of the hoses and disconnect them to the reservoir. Loosen the screw that holds the tank and raise it and unscrew the bottom hose. Wash the reservoir, check for cracks, and replace it if necessary. Install and refill the cooling system.