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post #4 of (permalink) Old 22nd February 2008
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Unhappy Clio Heater Matrix

Early Clio Matrix very guilty of clogging up, both heater hoses in the engine bay will be warm to touch but coolant will not be going through heater ,it only goes in ,down one side and out the other hose, this engine is 1171cc E type and is easy to fill with coolant ,you can try an engine flush, but i doubt it, but best option is to take both heater hoses off engine and put a garden hose on each pipe to reverse flush through heater, but in almost every occasion the matrix will have to be renewed, this corrosion is caused by infrequent coolant changes and these smallbore pipes get clogged solid, I have fitted 2 new matrix units for this reason, not recommended, but try everything else first
hope this helps MK 1 Clio heater system is great when matrix is clear
Currently in genisis's garage:
2002 Clio 1.5 DCI

Last edited by genisis; 22nd February 2008 at 10:45 PM.
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