valentinablaze6
Prius AC compressor failure
Summary of the thread
A 2002 Toyota Prius hybrid experienced an AC compressor failure, resulting in the air conditioning system blowing warm air. The issue was identified through error codes, and potential causes included a faulty AC relay or a pressure switch issue due to low refrigerant. The problem was ultimately diagnosed as undervoltage, which was resolved at a workshop for a cost of 240€.
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4 comment(s)
valentinablaze6 (community.author)
Where exactly is the AC relay located? And how would I check the pressure switch? I'm not very experienced with HVAC systems.
johnsky6
The AC relay is usually in the main fuse box under the hood; check your owner's manual for the exact location. As for the pressure switch, a visual inspection for any signs of refrigerant leaks around the AC lines and components is a good start, but that's not a perfect test. Honestly, for a proper diagnosis of the HVAC system, it might be best to take it to a workshop.
valentinablaze6 (community.author)
Thanks for the help! I took it to a workshop as you suggested. Turned out to be undervoltage causing the issue. Repair ended up costing 240€. All good now.
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TOYOTA
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PRIUS
johnsky6
I had a similar problem with my Prius, though I don't know about the specific error code you're getting. Check the AC relay first; that's an easy swap. Also, look at the pressure switch. If the refrigerant is low due to a leak, the switch will prevent the compressor from engaging to protect it. Is it only triggering at high revs or not at all?