I had a very classic (or so I thought) case of blown head gasket in my car:
- Leaking a ton of coolant
- Bubbles in the coolant, when engine running
- Coolant seems to be brownish
- Failed CO2 Test on the coolant
- Trouble starting the car from time to time
I spoke to several mechanics, watched a bunch of youtube videos, read a ton of Q&As on this site and posted some questions myself and was absolutely sure that what I had was a blown head gasket.
I than send my car to be repaired in my home country and was surprised to find out, that they didn't think the head gasket is blown, but another part. They fixed that part, didn't touch the head gasket at all and now the coolant leakage is completely fixed (car has been driven for 300km since).
The part they fixed, is some sort of heater, between the motor and the exhaust, which is supposed to heat up the fumes? I didn't understand it and didn't find it on google.
So what could it have been if not a head gasket problem? I thought that C02 test is an absolute certain 100% indicator of head gasket problems?
Where else can fumes enter the coolant, except through the head gasket?
What part did they probably talk about?
I am torn between these guys being absolute geniuses or not knowing at all what they are doing. Maybe the gasket still needs repair? Or I almost changed the head gasket for no reason at all, while not even fixing the problem?
The part in question:
The car in question is a Nissan dci 2.0 2010 Qashqai (Similar to Nissan Rogue in the US).