even though warning light goes out, there is still power to heater plugs for a short while [depends upon air temp] i suspect that your heater plugs are at fault, you need to make sure there is a feed to heaters when ignition turned on initially -you could check which are at fault by removing electrical connections on heaters and check there is continuity through each in turn,the ones with none = u/s
k
November 2009
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