Holts Speedflush Coolant Flush, Universal Car Radiator Flush, High Performance Coolant Flush For Radiators & Cooling System, Quick & Easy To Use, Prevents Overheating, Suitable For All Cars, 250ml

Used to flush the coolant system in a 2014 Audi A3 2.0 TDI. This stuff worked great, as I had a suspected blockage within the heater core. Super effective at removing all the hidden gunk and debris within the system. Before I used this, I had good colour in the coolant. I bought two bottles of this. The first bottle went in with the current fresh coolant, and it pulled out so much gunk which was probably the culprit of the blockages. I drained the system and put in fresh distilled water, along with another bottle of this stuff, and that also again pulled out so much gunk. Finally drained that and put in fresh coolant. The difference between before and after on the heater core is massive. I am usually dubious about additives for cars, but this did as advertised, and very easy to use, as just a pour in application. Good value for money. I would consider buying this every few years to run and use before doing your own coolant replacement as part of preventative maintenance, as the price of this far out weighs any price for a mechanic to tell you the cost of them doing a flush. I used this product over the course of a day, running the car for around an hour each time at full temperature, to have it really work as well. Probably works well as recommended by the manufacturer as well. Will definitely being buying this again and using it again in the future.

I used Holts Speedflush Coolant Flush on my car’s cooling system and was really impressed with the results. It did a great job of cleaning out old residue and rust from the radiator without causing any leaks or issues. The instructions were clear, and the process was straightforward just mix, run, and flush. After using it, the coolant ran much cleaner and the engine temperature has stayed steady. It’s a great option for regular maintenance or before refilling with new coolant.

Good price for a renowned brand. Could.do.with a bigger bottle.

Worked really well clearing out the rubbish in my cooling system.

Good quality product for clearing clogged radiators and cooling hoses in cars, easy to use and quite fast, I always buy 2 as sometimes a repeat application is required on a particularly clogged vehicle cooling system

Flushes the system well.

Got the heater working again in my 40yo Monza.

Works as its meant to work & clears gunk out of system.