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Q: Air conditioning and heating not working after accident

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Hi my air con and heating are not working in my car. I was involved in an accident last week (a car pulled out on me and I swerved and mounted the pavement) I heard a crunch but there was no visible damage to my car other than a small scratch to the alloy wheel. So I didn't take the other drivers insurance details. However now the ac and heater aren't working I am worried some damage was done to the underneath of the car. It would have been the front left of the car. Would this be where the ac/heater run from?? I just want peace of mind. I'm hoping not as I haven't had the car long and if it isn't due to the accident I should be covered under warranty.

Thanks for your help Laura

My car has 16000 miles.
My car has a manual transmission.

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