Webasto Thermo 90 Heater Service Manual

The Webasto Thermo 90 is an auxiliary heater fitted to cranes and heavy vehicles. It warms the cab or the coolant so the machine starts and works in cold weather. When one quits, the person with the wrench needs fault meanings, test steps and repair procedures. That's what a service manual is for.

What this manual helps you do

• Diagnose a no-start or lockout using the troubleshooting section
• Check heater operation step by step with the functional tests
• Trace wiring faults with the circuit diagrams
• Follow the servicing procedures during routine work on the heater
• Replace worn or failed parts using the repair section

Who this is for

You're a crane service technician, a rental fleet mechanic or an independent repair shop fixing heaters in-house. It also suits plant maintenance staff who inherited a machine with a Thermo 90 and no paperwork.

FAQ

Q: What do I receive and how is it organised?

A: One PDF file, 52 pages, in English. It runs from the introduction and general description through functional description, technical data in both standard and metric measure, troubleshooting, functional tests, circuit diagrams, servicing and repair.

Q: Which heater does it fit?

A: The manual is titled Thermo 90 and Thermo 90 S Workshop Manual, so it covers both the Thermo 90 and the Thermo 90 S.

Q: How does it fit the job I'm doing?

A: It's the complete manual for this heater. You get the working sequence a shop needs: understand how it runs, check the technical data, diagnose the fault, test it, service it, then repair it.

Pull up the manual at the bench, work through the fault diagnosis and tests, and get the heater running again.

Click here to view the preview (PDF)

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