In this video, young mechanic Aiman will give you ideas and show you how to bleed the INVERTER coolant system loop to get rid of trapped air bubbles in a Gen II Toyota Prius Hybrid Synergy Drive I4 1.5L car. Second generation Prius vehicles includes model years 2004, 2005, 2006, 2007, 2008 & 2009. Here are the #ᴬᴰlinks to tools, parts and accessories you may need to perform this repair:
1. [ Ссылка ] | G9020-47031 Engine Electric Inverter Cooler Water Pump Assembly for 2004-2009 Toyota Prius 1.5L
2. [ Ссылка ] | Coolant Control Valve fits for Toyota Prius Coolant Flow Control Valve 2004 2005 2006 2007 2008 2009 4Cyl 1.5L Heater Control Water Valve,16670-21010 601-021
3. [ Ссылка ] | Zerex Asian Vehicle Red Silicate and Borate Free 50/50 Prediluted Ready-to-Use Antifreeze/Coolant
Or Click on Amazon link here and search for what you need: [ Ссылка ]
So why do you need to bleed the inverter coolant loop? Perhaps you replaced the parts such as the pump, hoses or even radiator. In this video, Aiman explained how the air bubbles can form, and what happens afterwards. If there are air bubbles in the system, the coolant will get pushed out into the reservoir or expansion tank and finally into the ground. Getting rid of trapped air bubbles is critical to inverter and must be done to avoid overheating and potential damage to the transaxle system.
The IVL system is completely independent of the ICE (Internal Combustion Engine) cooling system. It uses a separate radiator and water pump, and it operates at a lower temperature than the ICE cooling system. Bleeding involves re-cycling the coolant through the Heat Storage Tank Canister by turning on and off the CHRS relay.
The Prius transaxle system, with its use of heavy-duty motor/generator units, is no exception to this rule. Temperatures get so hot under the hood that the vehicle requires a dedicated cooling system to prevent catastrophic damage to the stator windings. This is where the IVL comes into the picture. It functions separately from the engine cooling system.
The inverter loop includes a brushless 12V electric pump to circulate coolant through the baffles of the Prius transaxle. This fluid absorbs heat from the inverters, then flows past the engine’s electronics, cooling them in the process. It releases heat to the surrounding air as it passes through the vehicle’s radiator, then returns to the bafflers for the next cooling cycle.
Important difference between IVL & ICE. The IVL doesn't have a thermostat. It also keeps the coolant at lower pressures.
The Prius uses an independent cooling system to keep the inverter and motor/generator (M/G) at a safe temperature. In warm weather, problems with the inverter cooling system are fairly common in both the Gen 1 Prius (2001-2003), and Gen 2 Prius (2004-2009). The inverter cooling system uses the same type of coolant as the ICE cooling system.
Inverter Cooling Loop does a good job of protecting the Prius transaxle from heat damage. These systems eventually develop a host of problems, including:
Air pockets forming in the system: Can be removed by using the built-in bleeder system to flush out old coolant, but fixing the underlying problem means replacing defective components.
Pump failure: This can be diagnosed either by removing the cap of the expansion tank and checking for circulating fluid or by touching the pump housing while the Prius is running. If it fails to vibrate, then the pump is not working.
Low fluid levels or use of non-standard coolant mixtures: Toyota is very clear that only its formulas should be used for cooling the Prius transaxle, otherwise could result in poor heat control to outright vehicle damage.
Here's the complete playlist of our Prius' videos: [ Ссылка ]
Thanks for watching, please check our other DIY auto repair tutorial & guide videos on EyeOnAiman's channel. Other cars Aiman have worked on includes Honda Accord, Civic, Insight, CR-V, Hyundai Santa Fe, Elantra and Toyota Prius Hybrid.
Obviously, Aiman's auto repair videos are mostly designed for entertainment purposes. Aiman is not a professional and not a certified ASE mechanic. The videos should always be used only as a guide.
You can watch all of Aiman's auto repair videos in the following playlist: [ Ссылка ]
This video is presented to you by Aiman-Imran Anuar. You can watch more of#Gen2Prius and #Aiman_DIY_Auto_Repair videos on #EyeOnAiman Youtube Channel & Facebook Page.
Note: This video is NOT sponsored. Some product links are affiliate links which means if you buy something we'll receive a small commission. As an Amazon Associate we earn from qualifying purchases.
Recording Date: November 29, 2018
Video URL: [ Ссылка ]
