CRC FiberLock Head Gasket & Block Repair - How to Use Instructional Video

A crack in the engine block could be an expensive and time consuming repair. CRC FiberLock® Head Gasket & Block Repair can permanently fix a head gasket and coolant system leak without having to drain your cooling system, and get you back on the road in as little as 30 minutes. You can repair head gaskets, engine blocks, intake gaskets, cylinder heads, freeze plus and heater cores.
You must start with a cold engine. Before you begin, read the entire product label and be sure to wear eye protection and gloves when working on your vehicle.
Check the treatment ratio on the label. Remove the radiator cap. Ensure the fluid level is low enough to add the correct amount of FiberLock. Do not overtreat. Shake the bottle well for 30 seconds. And then start your vehicle. Slowly add FiberLock in the radiator. Be sure Not to exceed the capacity of your radiator. Replace the radiator cap. turn the heater on to high and let the vehicle idle for 20 minutes. Drive for 10 minutes. Turn the vehicle off and let it cool down. Once the engine is fully cooled, check the radiator. Add coolant if the level is low. If the leak persists after 200 miles in five days, you can repeat treatment. If the leak persists after second treatment, you may need a professional repair. So Stop Leaks and Start Driving with CRC FiberLock® Head Gasket & Block Repair

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[MrOcto]

Used it for my 06 Dakota. Worked well, no more leaking and check engine light turned off. It lasted over three years. Going to try it again, hope it repeats itself. 🤞

[mawfish]

Worked as advertised on my 2010 diesel xtrail. Pressure was building up in coolant and then losing coolant.
I only used 1/3:of a bottle to avoid clogging problems. It took about 4 days of driving to fully seal the leak.
I have had no side effects or issues. I've found having the heater and fan on and feeling the temperature of the blowing air is the best aid to seeing how the fix is progressing. The heater core is high in the cooling system and gives good early indication.
If the air is getting much cooler you are losing coolant and need to stop driving and add coolant. If the air is not stable, getting warmer, cooler, warmer you are getting air/exhaust bubbles in the coolant and pressurising your coolant system. Stop the car and let some pressure off before you lose coolant. Drving carefully helps keep the fibrelock in the cooling system for as long as possible where it can plug the leak over time.

[luanominh]

Admin, let me ask, after pouring it into the engine and idling for 20 minutes and driving for 10 minutes, does the CRC solution have to be removed from the radiator? Or still leave it in there and use it?

[kp]

If all or most of my antifreeze ran out of my radiator, and I add the CRC formula, do I add antifreeze directly afterwards the application or do I let engine idle for 20 and then drive around for 10 minutes and THEN add antifreeze to my system?

[ekz]

If the only way to add coolant is through a expansion tank i’m assuming I can’t use this product then? There is no opening for the radiator on my mini cooper

[glenstewart]

is this ok to use as a preventative, without confirming a leak? i was in an emergency situation and had to drive my very old van, for way too long, with the needle way too close to the red line, so im sure there was some warping of the head or wearing of the gasket, which would mean its only a matter of time before going full-blown? can i get ahead of that with this?

[nicholasbrown]

If it takes longer than 20 minutes to reach normal operating temperature. Do I need to let the vehicle reach operating temperature before driving for 10 minutes?

[harunkarakus]

I will use it for my old honda civic tomorrow, i will share my experience here again.

[Kipgirl]

Is this ok to use with 50/50 antifreeze?

[nicholasbrown]

Also, is there a recommended amount of time to leave the vehicle before driving again?

[ruthlugo]

Gad a mechanic friend do this sealant by the instructions. Drove well without heating for about 40 minutes.
I go home and car lever goes to H ! But doesn’t do the heat thing. Very strange. Any advise.

[markrobertson]

If this works and stays sealed, should I flush the system out?

[leonanim]

How do you add it to a system that doesn't have a radiator cap, but has a pressurized reservoir like a Volvo?

[herbertwoodbury]

How do I do this with a GM remote resovoir

[jgmopar]

I did everything as described while on my 10 minute drive car overheated and I had to pull over and stop engine. The truck ran warm with same type of drive before adding CRC but never overheated to point i had to stop and had boil over.

[simonallan]

I had a minor leak in my Nissan TD27T that was letting coolant into the combustion chamber as the engine cooled, the motor had no over heating problems at all, just damage occurring to injectors occasionally, but as soon as I added 250mls of this CRC Fibrelock additive, precisely as instructed, my engine began overheating, I have no idea how this can happen, as the coolant level was perfect and nothing else had been changed except for this product being used, from maximum of 180° to average of 200° is totally unacceptable for a product that is guaranteed x2?? my cooling system is now of no use after having an almost new aluminum radiator fitted, is this additive put an insulation layer on the inside of the radiator core? or does its ingredients and viscosity cause it not to release the heat adequately while passing through the radiator? I have never had such a damage causing additive that was so instant and permanent, great sabotage item that I'm going to warn all my customers and automotive associates about, if I still haven't heard back from CRC or Repco by the end of this week.

[Christopher-zqwc]

This stuff is amazing, cracked block, head gasket, leaks gone...also only used half of the bottle...