Dear Motor Medics,
I have a 2021 Ram 1500 with a V6 engine that has a ongoing coolant leak. The leak is small and coming from the thermostat housing area. I have had the truck repaired several times with both the thermostat, water pump, and then thermostat housing being replaced. The leak consumes about a pint of coolant a month.
Can I use one of those cooling system sealers to fix it? I don’t want to clog up the system trying to stop a leak. If I use it, how long does it last? Gary in Litchfield, Minnesota
Dear Gary, We have seen this leak on multiple Ram trucks in the past few years. There have been upgraded thermostat housings and thermostat covers which should fix this issue but in the colder climates we have seen multiple repeat failures.
If it is still under warranty, take it back to the shop that serviced it.
If it is out of warranty, or you performed the work yourself and are tired of trying to seal up that small remaining leak, then a sealer may be the ticket.
We have had great success with a permanent leak sealer called KSeal. KSeal does not clog the system and is meant to be a permanent repair that you add to the system and leave in.
Don’t use it with other sealers and don’t flush it out. Follow directions and if you have the results that we have seen it should stop the leak.
Take care,
The Motor Medics
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