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Can the elec.water pump on 2011 prius stop ac comp. from…

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can the elec.water pump on...
can the elec.water pump on 2011 prius stop ac comp. from coming on ?
Submitted: 2 years ago.Category: Toyota
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Answered in 23 minutes by:
9/8/2015
Toyota Mechanic: Jared D, ASE Certified Technician replied 2 years ago
Jared D
Jared D, ASE Certified Technician
Category: Toyota
Satisfied Customers: 2,242
Experience: Shop Supervisor at County Fleet
Verified

According to the schematic/fault tree from Toyota, it looks like the AC will not operate if the engine is above the target coolant temp. In other words, if the vehicle is running hotter than it should because the electric water pump is not working correctly, the AC will not operate to avoid overheating the engine even more.

Are you having problems with the electric water pump?

Have you had the AC system checked to see if there is low refrigerant pressure?

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Customer reply replied 2 years ago
the car is not running hot,i cant check Freon until comp. starts.water pump seems to be making a terrible noise
Toyota Mechanic: Jared D, ASE Certified Technician replied 2 years ago

I've heard really noisy coolant pumps in the prius when the coolant level is low. The pump has a hard time processing through air pockets and it whines like crazy. How does the coolant level look?

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Toyota Mechanic: Jared D, ASE Certified Technician replied 2 years ago

You could test the ac compressor by jumping the pressure switch. I attached a picture of its location. If you jump the connectors with a paperclip you can signal the system that there is enough Freon to run the compressor. Don't do it for very long, because if there isn't sufficient Freon it will damage the compressor since Freon acts as a lubricant for the compressor.

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Toyota Mechanic: Jared D, ASE Certified Technician replied 2 years ago

I wanted to check up and see if you needed any additional help. I hope I have been of some assistance to you and would appreciate a positive rating if I have.

Thanks!

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