How long can I leave radiator flush in the system?

[Kalahari Vegmot]

I want to add a bottle of Wynns Radiator Flush to my Jeep's cooling system to help clean it out thoroughly before I replace the viscous fan clutch, water pump and thermostat.

I was thinking of tackling the above-mentioned over the weekend...

Would it be safe to pour the radiator flush in now, and leave it in until the weekend, or should I rather put it in Saturday morning, run the car, and then work on it?

Thanks in advance!

[Chris G]

I want to add a bottle of Wynns Radiator Flush to my Jeep's cooling system to help clean it out thoroughly before I replace the viscous fan clutch, water pump and thermostat.

I was thinking of tackling the above-mentioned over the weekend...

Would it be safe to pour the radiator flush in now, and leave it in until the weekend, or should I rather put it in Saturday morning, run the car, and then work on it?

Thanks in advance!

No don't put in in now. Rather put it in on Saturday. Bottle says something about 20 minutes if I remember correctly? Or was that a 20km drive, it's fun forgetting these things

[Kalahari Vegmot]

No don't put in in now. Rather put it in on Saturday. Bottle says something about 20 minutes if I remember correctly? Or was that a 20km drive, it's fun forgetting these things

Yes the bottle says to run at fast idle for at least 10min or up to 20km..

[Changa Bulanga]

Be sure to use HOAT antifreeze/coolant additive. Mopar is the best bet (and fairly reasonably priced) but otherwise a decent branded product.