what do i need to check or do?

 

You sure that aint just some dirty water or rusty water? the likely hood of coolant in your airbox is not to high.. if it is.. you prolly need a new motor.

 

Due to the lack of information you have given. An educated guess it sounds like a blown head gasket to me. Is there coolant in the engine oil as well?

The head could be cracked as well.

 

is your radiator over flow flipped into your snorkel somehow?

Did someone pour the coolant in your airbox thinkin it would make it run cooler?

 

how do I check dealer said same thing he wants at least 300

 

dealer said gasket or head but is it worth fixing it myself? I have no mechanical skills

 

Depends on how much damage was done to the engine.

Is there coolant in the engine oil?

 

i cant imagine there could be any antifreeze in the air box. i wouldnt think it would even run very long if the gasket or head is cracked. check the oil first thing to see if theres water in it. if there is then you need a rebuild at least i would guess.

 

if u got real rowdy on it (or flipped it) , oil will leak back into the air box...its green like antifreeze. Just a thought. Not a big deal if it is, wipe it out and ride on!!

 

sorry about posting on an old thread but i have the same problem i have drained the oil on mine and changed the filter a couple times and the fluid in the air box does not look like oil so my only guess is radiator fluid coming out of a black hose on the left side of my air box quad runs good tho so its not changing anything (yet) i just bought the quad like this