I am going to flush cooling system and replace coolant in my car in near future and was planning on using a radiator cleaner product from Liqui-Moly. The place where I do my DIY auto work like this is about a 25-minute drive by highway. I thought it might make sense to add cleaner to radiator and then drive there, i.e. car would be operating at speed and typical driving temperature for the ~<30 mins or so the product recommends, and I wouldn't then have to wait an hour or so for engine to cool down to be able to add it just to then have to bring it back up to operating temperature and let it sit for ~20 mins.
So question: is there any concern about actually driving car (as opposed to letting it sit idling at same temp) for this amount of time while product is in system? I wouldn't think so but figured it wouldn't hurt to ask...
edit to add some info re: Liqui-Moly Radiator Cleaner product
Add contents to the cooling water. Turn the heating to maximum and let the engine run on idle for 10 - 30 minutes depending on the degree of contamination. Drain the coolant and flush the cooling system with water. Fill the cooling system according to the manufacturers instructions. Contents (300 mL) is sufficient for 4–10 Liters (1 gal. to 2.6 gal.) coolant water.
Full reference here: Liqui-Moly Radiator Cleaner