Hey Prius Peeps, 2005 with 230k on the clock. Just had p1121 pop up and did the coolant valve replacement. Easy peasy fix. Drained the old coolant, slapped on the new valve, and bled the system correctly, or so I thought. Now the whirring noise at startup is different. Thoughts?
Make a recording of your noise and post it. AFAIK, the "usual" whirring noise at startup is the brake actuator pump.
SFO, I did. And the amount that came out, went back in. So that is why I made the unsure claim about performing the fill-up procedure correctly.
Ok, so update. The noise is coming from the coolant pump itself. It goes through several “pump” cycles in a row, then shuts off. I was stopped when I heard it and touched the pump to see if it was indeed that. It was the three way pump. I changed the pump a few days ago. Is this normal
Was the new valve an OEM replacement, and purchased from the dealership? Others have reversed two of the three hoses when reinstalling the new valve, is that a possibility?
What do you mean by the three-way pump? The three-way coolant valve is, well, a valve not a pump and is part of the engine cooling loop. The pump that is in the same general area is the inverter coolant pump and is part of the inverter coolant loop These two loops are totally separate from each other. It would be good to step back and clarify what it is that you replaced and to what part you are now referring.
Purchased the valve from a 3rd party parts distributor, so non OEM. Pops is a mechanic and we did the work at his shop. 98% sure we got the hoses back on right. Now that I am more aware, I’ve been leaving the radio off to hear the 3way valve noise, and on cold start up I get whooshing water noise in the mid dash area. So much damn fuss over such a small part. The install was less than fun too.
First that after Market valve will probably not last long you must use the TOYOTA OEM Denso valve. The whooshing sound your hearing is air in the system. Very difficult to get air out of the ICE coolant loop you must cycle the CHRS pump the thermos by the front of the drivers side front wheel while basically burping the rad by opening the hex valve on the drivers side of the rad. You probably are checking the coolant level by the over flow tank...dont... that tank can be full and the engine almost empty it is no indicator of coolant level. take the top plastic cover off the top of the rad you will see the rad cap open it up fill up the rad up leave the cap off and put the car in Inspection mode so it will run. Turn on the heat in the cabin full heat. But be aware it may be very air locked and could overheat you will never know as the car has no temp gauge. Borrow a scangauge from Pops. Do not over heat this motor hilarity will ensue on your wallet. Search Prius Inspection on youtube.
