Symptom: overheating (>212F & <220F) with the A/C operating on traffic
Engine: 4D56 turbo
Trans: A/T internally cooled by engine radiator

Previous R&M done:
1. Head Gasket replacement (5 months ago)
2. Installed 82C thermostat (last feb 2011)
3. Changed to SAE 15W-40 engine oil (2 weeks ago)
4. Valve clearance adjustment (0.25 mm) 2 weeks ago also

Other inspected parts:
1. Coolant level ok. No leaks and doesn't consume coolant. I usually recycle the coolant at the reservoir back to radiator. For the past 5 months, I approximately consumed 1.5 liters of water.
2. Upper hose not hard as a rock
3. Lower hose not soft as a sponge
4. V-belt tension ok
5. Water pump not weeping coolant via weep hole. water also circulates as per inspection at the rad neck
6. No binding brakes
7. No cross-contamination of engine oil, coolant and AT fluid
8. Bubbles about half an inch to 1 inch come out of the rad neck in intervals of about 5 seconds or more even at operating temp. Coolant level rises up at rad neck
9. Exhaust smoke colorless at idle
10. Cools down after constant high revs at idle, highway runs, or with the hood open and sometimes after splashing water at the A/C condenser (note: not the engine radiator)
11. With the hood closed, temp climbs =>212F with the A/C on but stays in between 180F & 200F with the hood open.

My gut tells me that its an airflow problem and the headbolts coming loose again. I just did the head gasket job 5,000 km ago.

Please help guys. thanks