What could be the cause of a really weak heater? I replaced the thermostat but it still doesn't blow warm air until it's been running for along time. Also the fan does't blow that much air, what could that be?
The cause of the fan not blowing much air is very likely a dirty air filter located behind the centre console. I replaced the filter on a right hand drive car by first removing the driver's side kick panel. I looked in toward the back of the centre console and found a catch that had to be released. I then pulled out the air filter which was surprisingly long.
The poor air flow could also be the cause of the heater problem.
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