Climate control not working after disconnecting the battery?

2001 VOLVO V70
191,000 MILES
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DEB61
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After disconnecting battery the climate control won’t work fuses checked by auto technician all ok apparently.
Apr 21, 2025 at 6:45 AM
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STRAILER
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I would do a hard system reboot which should fix the problem, here is a guide to help you:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

Please go over this guide and get back to us.
Apr 22, 2025 at 11:12 AM
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DEB61
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Ken L

Many thanks for this information have tried all options with no luck all fuses checked but now suspect it can only be the climate control unit that has blown because unit dead no lights etc. Would you think the same?

Thanks again
Debbie
Apr 26, 2025 at 9:30 AM
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STRAILER
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This can happen due to a voltage surge which can occur when the new battery was installed. Here is how to change the unit out, I would check eBay for a replacement part. Check out the images (below). Let us know how it goes.
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Apr 27, 2025 at 12:13 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.