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The check engine light means something is wrong in your car or ecu. You should visit Renault to see what\'s going on with a PC diagnostic tool. The other light is a sign the diesel heaters are preparing before starting the engine. But you definitely need the diagnostic tool with the right cable to check your ecu for faults.
had a similar problem with a vw golf, it ended up being a snapped exhaust mount which caused the exhaust to hit the mid section of the car when i accelerated
Most likely to be a faulty resistor block, which has 3 resistors and a thermal fuse controlling fan speeds 1,2 and 3, maximum speed 4 by-passes the resister block. It may also be poor electrical connections to the resistor block caused by overheating. Renault ask for approximately £350 to carry out repairs, a replacement resistor block will cost £50. If you decide to carry out the repairs yourself, be advised that if you are not competent to carry out such work you, could cause electrical damage or worse an electrical fire.
This being a diesel, lack of compression is your worst enemy. These symptoms sound like a blown head gasket. Check your coolant for signs of oil, and check your oil for signs of coolant. (oil will be milky looking) Also indicative of a head gasket problem is an oil or coolant leak from the engine as well. If you see no evidence of the above, have a compression test done, and it should show up.
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