My yukon is running hot but there are no holes in the radiator and there is a leak on the passenger side?

I would replace the radiator cap and then recheck for overheat

Many times when the intake manifold gasket is bad...it leaks internally into the heads/crankcase...be sure to check oil level...the missing coolant will be in the motor, preparing to do damage...get a second opinion as this is a costly repair...is your motor running hot?

Sounds like you have a clogged radiator, i would recommend trying to flush it out before replacing it.

If it's leaking that bad, open the hood take off radiator cap and fill with water (without making a mess and spilling a bunch. Then simply watch for where the leak is at, if it's leaking from a hose, the radiator, or from around the area where the belt is located on the passenger side of the engine compartment. If it's leaking from the passenger side around the belt area your water pump is the most common cause. They are made so when the bearing wears out around the shaft the pulley bolts, it has what are called weep holes and the water just runs out to tell you to replace the water pump.

your heater core is leaking.

Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.

Do you have any coolant on the passenger side floor board? Coolant causing the radiator to fog up is a symptom of a leaking heater core.

You have a heater core leaking.The vehicle has a small radiator looking part,that the radiator fluid flows threw,and of course,is hot.The blower motor blows threw the heater core,and gives off heat.When they devellope a hole,or a crack in them,they leak.These leak into the floor board.I hope this helps you ,and if so,please let us know.Thank you.

have u replaced the radiator and hoses? Thermostat could also be stuck open. Water pump could also be your issue. with motor cool and of remove radiator cap(cap may be bad as well) top-off fluid and start car check for fluid flow with flashlight. Water pumps typically leak from what is called a weep hole when the shaft seal fails. Yours will be located under the timing cover (drivers side) running of the timing belt.
Hit me up after u have check on these.

you need to put a pressure tester on it to see where the leak really is. if you have use of a hoist,it is handy because heater cores can leak and the water can run down in a remote location and fool you into thinking it is somewhere else.