How to replace the coolant temperature sensors and radiator thermoswitch on 2003 Mazda Protege?

Those models produced between 1990 and 1994 have two cooling fan thermoswitches with those made after 1995 having the PCM control the cooling fan relay. The main thermoswitch can be replaced by removing the cooling system, removing the connector and installing a new switch. In the case of the secondary switch, take out the resonance chamber and repeat. Rebuild the cooling system then.

Genuine 2003 Mazda Protege Coolant Temperature Sensors

Coolant Temperature Sensor

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Make

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

1 Coolant Temperature Sensors found

View related parts
2003 Mazda Protege Coolant Temperature Sensor Part Number: B593-18-840A
$48.19 MSRP: $64.27
You Save: $16.08 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Temperature-Engine Coolant
- Replaces: B593-18-840
- Item Weight: 0.70 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: B593-18-840A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 2003 Mazda Protege Submodels:
- DX, ES, LX, Mazdaspeed, MP3 | 4 Cyl 1.5 L GAS, 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS

2003 Mazda Protege Coolant Temperature Sensors Parts and Q&A

Q: How to replace the coolant temperature sensors and radiator thermoswitch on 2003 Mazda Protege?
A: Those models produced between 1990 and 1994 have two cooling fan thermoswitches with those made after 1995 having the PCM control the cooling fan relay. The main thermoswitch can be replaced by removing the cooling system, removing the connector and installing a new switch. In the case of the secondary switch, take out the resonance chamber and repeat. Rebuild the cooling system then.