5.0 out of 5 stars Rad

M.I.A.H. · 26 May 2025

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5.0 out of 5 stars Excellent. One bottle solved our leak.

G.D. · 3 June 2025

One bottle solved my daughter's ongoing cooling system leak. Excellent as far as I'm concerned.

4.0 out of 5 stars Works well

J.G. · 11 May 2025

Worked well

5.0 out of 5 stars Solved a small leak

R.H. · 17 February 2025

Had a coolant leak somewhere on our VW Golf and by simply adding the bottle of Holts Cooling System Radiator Repair to our header tank it seems to have done the job.

5.0 out of 5 stars Good product

R.C.J. · 9 June 2025

Delivered on time as described

3.0 out of 5 stars Works but my leak was too big

m.j.g.g. · 17 May 2024

I know this stuff works, as it has in the past but the leak i'm dealing with was too big for it to work.Easy to use though

5.0 out of 5 stars Radiator sealant

E. · 15 April 2025

Worked wonders as my leaking radiator has been sealed till date

5.0 out of 5 stars Works

m. · 3 May 2025

Stopped the leak got the car 150 miles home to instigate a full repair