Pverheating, see below

EAMEDIC903

MEMBER
2002 NISSAN SENTRA
160 MILES

2002 nissan Sentra, 1.8. Overheating was initial problem. Flushed system, replaced coolant (it was due), replaced thermostat. IAT sensor was shot, replaced same. That was the only code showing. Had no heat, I had forgotten to bled air out of head. Test drove, it was fine. Let it cool, no heat, air in head again. No apparent leaks, no apparent coolant loss, no coolant out exhaust. If I bleed air out, runs fine until it cools again. Thinking of trying some block sealer to trouble shoot a possible leak I don't see.

1 Reply

KHLOW2008

MECHANIC
41,815 POSTS

You need to bleed the system fully to be able to ascertain if there are any actualproblem with the overheating.

Remove radiator cap and check coolant level. Top up if necessary. Start engine and run with heater on and radiator cap off for 5 minutes. When engine is running, monitor radiator coolant level. Top up if it drops. After 5 minutes, stop engine. Wait 1 minute. Top up coolant uif necessary and start engine. Once radiator coolant level stabilises, close radiator cap and run engine till operatng temperature and stop engine.
Allow engine to cool down and remove radiator cap to check coolant levelReplenish if necessary and repeat bleeding process. You might need to bleed the system a few times to get the air out of system.