Repair procedures and warranty information for model 520EV are now available
Peterbilt technical service bulletin 01-090 for 2021-2026 Peterbilt 579 and 2021-2026 Peterbilt 520.
- Bulletin number
- 01-090 (01-090)
- Component
- Engine
- Summary
- Repair procedures and warranty information for model 520EV are now available. The cab heater coolant system on Peterbilt 579EV and 520EV models may not deaerate properly, causing pump malfunctions and inadequate cab heating. Update coolant deaeration return line parts and procedures are now available to release trapped air back to the reservoir.
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