Going to Replace the Radiator - Anything else I should do at the same time?

Hi All,

First post, but I thought that I would hit the ground running. I purchased a rough 2007 Prius for $900 that ran like a champ for about 5,000 miles of tough San Francisco city driving. Well all good things must come to an end and the radiator finally gave out, which I knew was coming eventually as it was in a front end collision and radiators are made of tissue paper.

So I've ordered a new radiator and figured while I was going to be taking the front end apart anyway if there was anything else that I should change during the process. As far as the cooling system goes, I am having the following problems:

• Heater is not working
• Nasty loud sound when the car shuts off and the inverter pump turns on (runs smoothly in acc mode)
• P1116 CEL

I was thinking that in addition to the radiator I would replace the inverter pump and the coolant flow valve as I've read those parts fail at around 200K which is about what this car has.

Any input would be appreciated!

 

I checked the codes with a standard ODBII reader and with torqued through a bluetooth scanner. After reading some more posts on the forum I went ahead and ordered a miniVCI kit from Amazon and once I get my hands on a windows 7 laptop I will give that set up a try.

It sounds like what I've been calling the inverter pump is the CHRS pump

 

Thank you so much for that diagram, I think that I may know what caused my issue.

Based on the diagram, the fact that my heater now doesn't work and my radiator burst while driving on a hot day, I'm willing to bet money that my 3 way water valve is malfunctioning and it prevented/is preventing coolant flow. The strange part about that is that I only got a P1121 error once and it didn't reappear after I cleared it, which may just mean that I didn't drive far enough after clearing the codes while diagnosing my failed radiator.

I'm going to pickup the valve today from my local dealer and replace that along with the radiator this evening. Thank you so much for your help!