While cruising along down the M5 this weekend my car's developed a bit of a problem. It feels like a miss-fire, as in the car slows momentarily, and then sort of catches up again, all within the space of a second, so it's only just noticable. I had cruise control on, so it wasn't me tapping the throttle, and it only happens when the air con is on.
When the air con is turned on the temp rises very slightly to approx half on the scale, but never goes any higher. Could it be the ecu backing off the power due to heat? It only happens every 10 - 15 mins, and the outside air temp was only 23°C. It has enough water / coolant.
Where on the temp guage should the needle be when cruising at 80 - 85? Is it running hot and in need of a rad flush?
Any help would be appretiated as i don't want to leave this to develop into a costly problem later!
Cheers
Matt
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