If you're getting white smoke from the exhaust, losing coolant with no visible leak, or noticing a sweet smell from the engine bay those are the classic signs. Milky residue under the oil filler cap is another big one to check. Apex Auto Parts have put together a solid guide covering all the main blown head gasket symptoms if you want the full breakdown Blown Head Gasket Symptoms worth checking before you book it in so you can speak to the mechanic with confidence. Visit Us : www.apexautoparts.co.uk/parts/head-gasket