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Valeo Thermo Switch Review: Reliable thermal control for cooling systems?

Valeo Service 819745 Thermo Switch
4.7
[Precision Temperature Switching]  Opens at 92°C and closes at 82°C for reliable thermal control.
[High Operating Temperatures]  Designed for applications requiring an 82–92°C activation range.
[Robust Mechanical Fit]  Spanner size 29mm ensures secure, standard wrench installation.
[Lightweight Construction]  Compact 46 g body minimizes added weight in assemblies.
[Wide Application Compatibility]  Suitable for appliances, HVAC systems, and industrial thermal protection.
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An automotive cooling part designed to activate and deactivate coolant flow at set temperatures for dependable engine regulation. Valeo Thermo Switch presents straightforward specifications aimed at routine replacements and workshop repairs. Is this the right choice for the thermostat circuit in your vehicle?

⚡ At a Glance
  • Temperature Control: Reliable activation and deactivation within a defined thermal band for stable engine warm-up
  • Best for: Mechanics and DIYers performing thermostat or cooling-system maintenance
  • Not ideal for: Applications needing adjustable or electronic temperature control

Fixed-temperature thermo switch suitable for routine cooling-system tasks. Compact form makes it practical to keep in a workshop parts stash.


Consistent engine regulation - thanks to defined switching points

Closing temperature is specified at 82°C and opening temperature at 92°C, creating a clear activation band. The pair of set points ensures a repeatable change of state as coolant temperature crosses defined thresholds.

Predictable warm-up behaviour and repeatable cooling engagement help avoid unexpected thermostat behaviour during everyday driving. That stability supports routine servicing and diagnostics.

Workshop-friendly fitting - with a 29 spanner size

Spanner size listed as 29, matching common metric workshop spanners and sockets for tightening. The straight numeric spanner reference reduces the need for special tools.

Fast, familiar wrench fit speeds replacement and reduces bench time during repairs. Fewer tool requirements make it easier to swap parts on the roadside or in the garage.

Easy handling and storage - with a lightweight 0.046 kg mass

Weight given as 0.046 kg keeps the component light and simple to manoeuvre during installation. Low mass also minimises packaging bulk for stocking.

Lightweight construction makes carrying and fitting less cumbersome for technicians. Keeping small, light spares in stock becomes more practical.

✨ The 4 Key Reasons for Valeo Thermo Switch
  1. Defined switching band - Ensures predictable coolant flow control across a known temperature range
  2. 29mm spanner compatibility - Speeds installation using standard workshop tools
  3. Compact footprint - Fits into tight engine bay spaces without added bulk
  4. Lightweight (0.046 kg) - Easier to handle, transport and store during repairs
📋 Technical Details at a Glance
  • Category: Automotive Parts and Accessories
  • Brand: Valeo
  • Product ID: B00D0CPTPQ
  • Product Type: Thermo Switch
  • Closing Temperature: 82°C
❓ Frequently Asked Questions

Q: What temperatures does the switch operate at?

A: Closing temperature is 82°C and opening temperature is 92°C, defining the thermal range for activation and deactivation.

Q: What spanner size is required for installation?

A: A spanner size of 29 is specified, matching common metric tools used in garages.

Q: How heavy is the unit?

A: Weight is listed as 0.046 kg, making the unit lightweight and easy to handle.

🏆 Our Verdict

Suitable for mechanics and DIYers seeking a straightforward, fixed-temperature thermostat switch for cooling circuits. Clear opening and closing temperatures combined with workshop-oriented sizing make it easy to fit and diagnose. While exact cost will depend on supplier, the simple, well-specified nature of the part makes it a practical long-term replacement choice.