2010 Ford Fusion 2.5L Thermostat and Coolant Change time lapse

[@Billingtano]

What is the reason for using the vacuum tool? Can I swap out the thermostat without it? I have a 2010 Fusion Hybrid that's giving me a thermostat code. I have the replacement part and am trying to learn how to change it out. Any more info or tips would be appreciated.

[@fudgepudgypie4174]

The vacuum tool is used to get the air out of your system so it is fully filled with coolant. This is to eliminate risk of having a 'bubble' of air at a high point in the engine, which could mean a hot spot (if flowing coolant doesn't displace the bubble and push it through). I am not a professional so take my advice for what it is...an internet stranger. You could change the thermostat and refill lost coolant without evacuating the system, and I have done that in the past. I opted to buy the tool for this and future coolant changes to do it right. Depending on the passages in your engine it could be totally fine, but I don't know if that the case with this engine. My car was overdue full coolant change so I tried to drain as much as possible before I replaced the thermostat. It's a good question for a real mechanic probably. Good luck.

[@Billingtano]

@@fudgepudgypie4174 I appreciate your prompt response. I'm not sure I'm going to be able to do this one on my own. The hybrid engine has some high voltage cables and what looks like hard lines for the AC that are in the way. Not sure how to get around them without messing everything up so I'm going to try and find a mechanic friend to assist. Cheers internet stranger. 👍