Does my car have a blown head gasket?

[jakejwr]

I suspect my car (2012 1.6 THP 156) has a blown head gasket but I'm not a mechanic so I'm interested to hear what people think the problem might be.

• Milky residue on the oil cap which reappears a few days after I wipe it off. No residue on the dipstick.
• Loads of bubbles at the top of the coolant reservoir, but the coolant level is fine and there doesn't appear to be any contamination. Engine does not overheat.
• White smoke while the engine is warming up (which disappears once warmed up).
• Heater is not working properly on driver's side, lukewarm at best.
• Slight knocking noise coming from the engine. The oil level is normal and it's not losing oil. Idle is not rough but can feel a slight judder.
• Haven't noticed any loss in engine power or MPG.

Thanks for your help.

 

[Pedro]

Take all the plugs out check if any of them are wet? Coolant losses & milky white goo under the oil cap & on dipstick is a pointer
Mine produced white smoke & slight judder on the throttle from stop start so I changed the PCV valve & its never done it since
A blown gasket usually means power loss as 1 or more cylinders won't combust properly it feels like misfires on acceleration

 

[Jh72i]

Identify The Tell-Tale Signs Of A Blown Head Gasket | K-Seal® (kseal.com)