2009 Landcruiser pick up, just replace Head gasket, new cylinder head, new thermo stat, original parts!! Whele travelling at normal speed, 120kmph temp is fine, travelling at 150km temp increase rapi

Take it to a different shop and get a second opinion. It might need a complete rebuild, or it could be that a head gasket is shot, or one of the heads is cracked. Have them do a compression test and a computer diagnostic. Just guessing at an answer can get expensive.

I would agree with your diagnosis if you are loosing coolant into the engine. And the difference between cylinders is more than 25 percent. The standard number of 198 psi is just a reference not a minimum.
Usually if a head gasket is leaking, it leaks compression into the cooling system and makes the engine run hotter than normal along with burning coolant out the exhaust pipe.
Most of the time when you have low heat at idle but normal at road speed, the cooling system is just low on fluid.

cylinder head and or gasket leaking

3.9L, 5.2L, and 5.9L Engines To Remove:
3.9L Engine

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Remove or disconnect the following:
   • Battery negative cable
   • Coolant
   • Intake manifold-to-alternator bracket support rod
   • Alternator
   • Closed crankcase ventilation system
   • Evaporation control system
   • Air cleaner, air in-let hose and resonator
3. Release fuel system pressure.
4. Remove or disconnect the following:
   • Fuel supply line from the fuel rail
   • Accelerator linkage and, the speed control and transmission kickdown cables (if equipped)
   • Distributor cap and wires
   • Coil wires
   • Coolant temperature sending unit wire
   • Heater hoses and bypass hose
   • Vacuum supply hoses from the intake manifold (3.9L Engine)
   • Fuel injector harness and secure out of the way (3.9L Engine)
   • Cylinder head covers and gaskets
   • Intake manifold and throttle body as an assembly
   • Exhaust manifolds
   • Rocker arm assemblies and push rods, and identify to ensure installation in original locations.
   • Head bolts from each cylinder head and remove cylinder heads
   • Spark plugs

To Install:

1. Install or connect the following:
   • New cylinder head gaskets into position on the cylinder block
   • Cylinder heads onto head gaskets and cylinder block
2. Tighten all cylinder head bolts, starting at top center and in sequence
   1. Torque to: 50 ft. lbs. (68 Nm)
   2. Repeat and Torque to: 105 ft. lbs. (143 Nm)
   CAUTION
   When tightening the rocker arm bolts, ensure that the piston in that cylinder is NOT at TDC.
   
3. Install or connect the following:
   • Push rods and rocker arm assemblies in their original positions.
     1. Torque to: 21 ft. lbs. (28 Nm)
   • Intake manifold and throttle body assembly
   • Exhaust manifolds
   • Spark plugs
     1. Torque to: 30 ft. lbs. (41 Nm)
   • Coil wires
   • Coolant temperature sending unit wire
   • Fuel injector harness (3.9L Engine)
   • Vacuum supply hoses to the intake manifold (3.9L Engine)
   • Heater hoses and bypass hose
   • Distributor cap and wires
   • Accelerator linkage and the speed control and transmission kickdown cables
   • Fuel supply line.
   • Alternator and accessory drive belt.
     1. Alternator bolt - Torque to: 30 ft. lbs. (41 Nm)
   • Intake manifold-to-alternator bracket support rod and bolts
   • Cylinder head covers
   • Closed crankcase ventilation system
   • Evaporation control system
   • Resonator assembly (3.9L Engine), air in-let hose and air cleaner
   • Heat shields
     1. Torque to: 30 ft. lbs. (41 Nm)
   • Coolant
   • Negative battery cable.

Oil on the plug does not indicate a head gasket.
It could be a bad ring, valve guide or valve seal.
A leak down test will comfirm a head gasket leak
A compresion test will confirm a ring problem.
Oil consumption and smoke indicate ring and valve problems.
If it smokes on stat up, most likely valve guide or seal.
If if smokes when you drive and let off the gas quickly from speed, then most likely a ring or cylinder wall problem.

Good Luck

possible head gasket failure or cracked head. Check for water in exhaust to confirm. Remove/inspect spark plugs for water/coolant.

u have a blown head gasket here and a cylinder that is full of coolant, this locks the engine up.

Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.

change cylinder head gakate and check cylinder head that not bend from heat.

This sounds like a blown cylinder had gasket. Although on some engines you will find core plugs below the rocker coverin the head.