Alright, so I have done some research/advanced forum search, and have come up with nothing so far. I was going to flush my cooling system but every post on coolant flushes are manual drain and fill. Lots of people seem to have issues with getting air trapped in the system and having to bleed multiple times. Has anyone ever used a pressurized coolant flush machine that most shops have, or taken to a shop for this procedure? I know the coolant system on the FD is rated for a lower pressure (16psi) than most normal cars (20-25psi), so you wouldn't want to run the machine at full blast. The machine would replace coolant that its taking from the system 1:1, so in theory you wouldn't have any air ingested in the system and no problems after said flush. With how delicate the coolant seals seem to be, does anyone see an issue with this method? Figured I would ask before I try it out as there may be a reason why I don't see any posts about it, just cant think of any reasons to avoid it besides possibly running it at too high a pressure and blowing the seals?

 

Really, there's no good reason to do it.

With a Lisle funnel refilling the coolant system isn't hard at all.

- Drain the radiator and then remove the block drain on the driver's side of the middle iron
- Put the Lisle funnel on the car -
- Fill with 50/50 mix of Prestone regular green coolant and distilled water. 1 gallon of Prestone and 1 gallon of distilled water is enough.
- Run the car and let the coolant suck in as the water pump runs, keep adding to the funnel and keep about 2" of coolant in the funnel. Once the thermostat opens you will get some more air up and bubbles, keep filling. After a few minutes with the thermostat open shut the car off and let it fully cool down with the funnel attached and keep adding coolant as necessary. Let it FULLY cool down overnight then put the cap on and drive around. Over the next few drive cycles pop the cap when stone cold and add coolant if necessary, typically you just need a small amount.

I've done this MANY times, works great and if you change coolant once a year your engine will thank you.

There's no good reason to get more complicated with it.

With that funnel it's not hard at all to get all the air out.

Dale

 

Honestly ^ that’s pretty much what I do every other spring. Since getting the Lisle funnel it’s so NOT a hassle. I check it the next day but usually never have to add more than a cup of coolant to top it off.
The only thing I’d add is to just do a quick check of the coolant reservoir dip-stick and make sure it’s at the full mark cold

 

Yeah I don't think there is anything wrong with doing it the way Dale said. Was just curious about exploring other options that were presented, and wondering if anyone else has tried it. Or if anyone could think of why doing it may cause issues. Thanks for the input Dale/Sgtblue.