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lara_dragon7

C70 AC Control Unit Fault

My 2007 Volvo C70 diesel is throwing a wobbler. I'm getting 'Error stored in the error memory' and an error message across the speedometer. The AC refuses to kick in too! I'm getting codes pointing to a defective temp sensor in the heat exchanger. Think it's the AC control unit having a meltdown. Anyone seen this before?

Summary of the thread

A 2007 Volvo C70 diesel is experiencing issues with the AC system, displaying an error message related to a defective temperature sensor in the heat exchanger. The problem is suspected to be with the AC control unit. A similar issue was resolved by replacing the AC control unit, and it is recommended to have the vehicle checked by a professional.

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4 comment(s)

erik_kaiser9

Sounds familiar! I had a similar AC issue with my C70. Was the error pointing specifically to the heat exchanger temperature sensor, or were there other HVAC-related codes too? It could also be a refrigerant issue. Have you checked the pressure?

lara_dragon7 (community.author)

Yeah, the code is specifically for the heat exchanger temperature sensor. I haven't checked the refrigerant pressure, I don't have the gear. But given the error code and the other symptoms, does that sound like the same issue you had, with the control unit?

erik_kaiser9

Yep, pretty much identical to what I experienced. Turned out to be the AC control unit throwing a hissy fit and needing replacement. Get it to a workshop to get it checked out!

lara_dragon7 (community.author)

Cheers, appreciate the confirmation! I was dreading that it might be something else. Garage quoted 980€ to sort it, so I'll get it booked in. Thanks!

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VOLVO

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C70