Leaking from rear of motor.on cross member.checked heater hoses.and all other hoses .any other possible places to look.seems to leak more when using heater

Early 2.5L SOHC were known to get a head gasket external peeping leak it's possible that's what's happening?

Could be a pinhole in the steel heater pipe or the bypass pipe where it runs across the top of the block.

Or could be leaking from the o-ring under the crossover pipe.

OK.thanks