Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
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If any of the coolant that came out when you removed the cap stayed on the engine or exhaust, it can create a smell. Also, if the drive belt got wet, it can slip some when first running until the coolant dries off, which can cause a burnt rubber smell.
If none of this happened, then the hoses need to be checked for being spongy from overheating and giving off the burnt rubber smell