HELP PLS: overheating after replacing gasket head

Hi all, newbie here, can anyone please help me my my problem, I have a 1991 Super Custom 3L diesel engine van, i recently refaced the head cylinder, replaced the gasket head, overhauled the radiator, drain the engine and tighten back the head bolts but water is still gushing out from the radiator because of overheating. (specially when the aircon is turned on)

thanks all

From cold with the pressure cap off does it start pumping out? This would indicate a cracked head.

was it a new head? Was it a Toyota head gasket? Did you use new head bolts?

Hi Clive,

From cold, water is not pumping out with the cap off but when i drove a few blocks away, i stopped and checked again the engine. I noticed that the water from the overflow bottle is boiling. i've stopped the engine and let it cool for a while. i then removed that pressure cap and it was dried out. i've noticed the overheating when i turned on the a/c. I've also noticed water coming from under the van. My friend told me it was probably water coming out of the overflow.

the head is still the old one (we've only refaced it). the gasket is for a Toyota 3L engine but i think it's not an original gasket coming from Toyota dealers. The head bolts are still the old ones. My uncle told me that we should check again the head bolts  if they we tight enough because he told me that they tend to loosen up a little while overheating occurs.

Thanks Clive. Hope we can solve my problem eventually.

Thanks all

Head may have a crack that you can not see with your eye. The head needs to be tested for cracks.

It would help to check for water pump working, to check where the water under the engine is coming from I put the overflow hose into a container to as not to confuse fluid drips.

Head bolts are the stretch type. The bolt holes have to be clear. The bolts can bottom out and appear at the correct torque but still not clamping the head.

I've check the water dripping underneath and it is coming from the a/c. I will check the water pump if its working properly. Need to re-tighthen the bolts again carefully (we're afraid if we put too much pressure on the bolts it might snap, i think we should also consider replacing the head bolts)

Thanks again, your info is greatly appreciated

A/C condensation drip, ok so it's warm in the Philippines.