I've got a Renault Laguna 1.8 R reg and the heaters blow cold......i've flushed the water system with Rad Flush and i've flushed the system but its still ffffffrrreeeezzzzinnnggg!!!!!! has any one got an idea
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Right think the problem is the heater core is blocked with corrosion ,now remove the bottom hose from the rad and the heater hoses then flush every which way you can including through the heater core reversing direction then ,refit all the hoses fill with water only and see if heater works if so the remove the bottom hose again and drain ,then add a minium of 3 litres of antifreeze ,its a anti corrosion agent as well as antifreeze and without it the internal of the engine will corrode and the slurry will block the heater first then the radiator ,
My 2006 f-150 4.2L 113,000 miles heater blows cool when at Idle ,But when driving the heater blows hot. Change thermostat change water pump change the Rad. change the blend door motor
flush the block bleed the system add new green coolant. After all that still blowing cool air at Idle. What is causing this problem.
put a radiator flush in the expansion bottle .to clean the core of both your radiator and your heater. core will have dirt or rust .run the car for about 20 miles.then drain it .refill with 50/50 mix of anti freeze.now heating on full leave the cap off .turn over the engine,on tick over.push in the rubber hose with finger and thumb to remove the air out the bottle.then refit the cap.
There's a blockage some were as when ur driving the rpm is high so pressure is pushing hot water through when idling very low pressure u need to use strong flushing .agent and flush out your system also revirse flush if still doing it after this it will b ur main rad needs re coring not heater
you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.