2010 prius randomly blows AC fuse

I think in this vehicle it all runs through an AC computer I believe . Wen I was chasing AC troubles my blower always worked even wen compressor was throwing codes . So that kinda tells me that the blower system is like say a regular Corolla . It is possible that the blowers shorted. Or a wire is bare and makes contact with ground to blow fuse. Wen wire moves

 

Does it do it running the heat ,?

 

Check the connector on the compressor. Sometimes it leaks and water gets into it.
The compressor may be slowly and randomly using excess amperage.

You need to find a Toyota Tech who knows about the Prius. They can use TechStream
to run voltage/current reading and find the problem.

 

Before the thread goes off in two different directions, which fuse exactly are you replacing and calling "the AC fuse"?

Is it this three-in-one fuse numbered 1, 2, 3 in the underhood fuse box? That's for the blower (or at least segment 1 of it is).



Or have you been replacing the high-voltage fuse under the L-shaped inverter access panel?



That one's for the compressor.

 

Yes I believe that's more your blower motor and control fuse for the fan and the dash panel not the compressor so in other words you don't even have to turn on the air conditioning we're talking about turning on the heat and the blower motor let's forget about the AC that seems to work fine you're having trouble blowing the hot or cold air etc so if there's no fan the air conditioning won't come on because it's smart like that but the heat will blow generally regardless if you have it in manual mode set it to 80° whatever. But it sounds like something is moving down there somewhere and is causing a short and causing the fuse to blow or wire that's skinned something maybe somebody put a stereo in the car who knows If you have the car there may be telltale sign somebody's been behind there like for a stereo had a taxi meter in the car I don't know could be a myriad of things The circuit gurus will be along shortly with all the tests and whatnot you could possibly run with a meter or a test light

 

No, that one under the dash does not power the blower motor (that's the three-fer fuse in the underhood fuse box). So the issue here isn't excessive power running the compressor (that'd be the high-voltage fuse under the inverter access cover) or the blower motor (that'd be the three-fer).

This A/C fuse just supplies the incidental power to the rest of the HVAC bits, so, the ECU, the controls and display, the solar vent relay if you've got the solar deal, and so on.

It does supply the low-voltage, control side of the compressor too. The compressor gets its working power from the orange high-voltage cables, but its electronic bits are powered from here. Purple wire to pin 6 of the low-voltage connector on the compressor, which faces up. People have reported some problems with water and that connector. That circuit might be a likely suspect if driving through puddles seems to be involved.

 

Mines cracked dried it out connected sealed up with goop just a dap on the blk connector to seal it as a whole