1998 Polaris Sportsman 500 - Over Heating Help Needed!

[wery7]

Guys,

I took my quad out for the first real run since I bought it for my kids, and the temp light came on and coolant was releasing out of the over flow bottle/tank. As I would speed up, I could get the light to go away, but as soon as I slow down, it comes back on. Heres the deal:

The fan doesnt turn on until the temp light just about comes on or is on

Here are the things ive done or checked:

1) Radiator fins are clear of debris/mud

2) Thermostat replaced

3) Head gasket replaced

4) New thermo switch

5) Radiator "burped" of air

Anyone have any thoughts? Would a radiator cap at 15lbs instead of 13lbs cause an issue?

Edited October 16, 2013 by wery7

[oxidized_black]

bad water pump or impeller ?