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Re: Renault Laguna I - Phase 1 - Heating and Cooling - Heater Matrix Removal ( With A
Recently bought a series 1 Laguna 1.8 that had a blocked matrix
i.e. - pipe TO the matrix hot but pipe FRom the matrix cold.
I used the old method of one measure of NON bio washing powder to the coolant tank and 3 days later drained and refilled the coolant system.
All is now good!
The reasoning is that non bio washing powder ( or gel) is very mildly caustic and will / should cleanse and gunge out of the system. I have now used this method on various cars including a 1.4 megane , bmw and volvo. It has worked every time but please remember to not leave it in there for more than 7 days as it will cause more problems than it solves. Also when flushing then refilling the system use a good quality anti freeze.