So as the title reads, I have a pretty bad coolant leak that I can't figure out. Initially I thought it was the radiator since I'd noticed it had a leak. So I replaced it. Now I'm still losing coolant at the same rate (I fill up the reservoir every 2-3 days). Has anyone experienced this issue? 06 gs300 awd

 

look around the water pump

 

I once had a leak at my radiator, the top seal of the radiator went bad. Replace it with a new oem and youll be good to go, or see a radiator shop if there able to repair yours.

 

do check the water pump. check the weep hole for pink crusty matter

 

Pop the hood and look down at your oil filter housing – a bad leak from the water pump will probably leave quite a bit of pink coolant residue on the housing