I had the dealer flush the system the summer of 2006 or 2007. The radiator was also changed. since then I have had little to no heat in the van. we recently flushed the heating system again and pulled the hoses on the heating core and flushed that also to no avail. I'm at my wit's end. how do I fix this?
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Re: no heat in my 2002 madza mpv.
Two most common causes of your problem are low coolant ( air in the heater core) and a thermo stat stuck open. If you have a temperature gauge and it is reading on the low side. Like 140 Deg or less, you need a new engine thermostat. Feel the top of the radiator tank after the car has been driven. If it is too hot to touch, the thermostat is no the problem. As the system has been flushed and filled I suspect there is enough coolant. Last item on the list is the coolant valve for the heater core. Many cars have a water valve located in line with the supply pipe to the heater core. This valve may be in the engine compartment or under the dash. Check the heater temperature control and follow the cables. One cable most likly goes to this valve. Maybe a cable retaining clop has fallen off
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What does your radiator fill tank look like? When is the last time you changed radiator fluid? If you have an oil leak into the radiator, combination produces a jelly like substance that may be what blocks the screen. You may need a radiator flush and refill.
flushing out the radiator just cleans the radiator if your not getting any heat you will have to locate the 2 hoses that go into the firewall and either remove them from the moter or the fire wall and using a garden hose flush the heater core out.
Start with Flushing out your cooling system. Flush it out with Preston Radiator flush, you have your preference of ether the super flush which takes 3-6 hours or the 10 min flush which is good if you don't have the time to flush out your cooling system.
After you have flushed out your cooling system, replace your thermostat and you should be good for another cold winter driving. What happens is that after a few years of the coolant not being serviced, the coolant crystallizes and clogs up the heater core and radiator causing poor circulation. Poor circulation will cause poor heat and or overheating issues to the engine.
Before you go through all that inspect to make sure you have the right amount of coolant in your cooling system.
You probably never cleaned the cooling system out.
If you have not get it done by pros.
It seems something is blocking the flow. If the water pump went bad you will know. Rarely ever heard a impeller breaks off like you think. The bearings and the seal break first.
Check and see also if the heater valve is working.
As for the over heating even new thermostats fail. Reverse flush is needed or the procan measure the pressure in the radiator cooling system and edetermine if there is a engine pressure problem. Tools and experience is the key in the game of diagnosis.