gmc sonoma help....coolant leak?

[yankeefan1124]

i have a 2000 gmc sonoma that is leaking coolant when the engine sits overnight what could be the problem

 

[Mark]

you need to get your cooling system pressure tested. This will allow you to see what's leaking, then you'll know where the problem is. You can have a shop do it or borrow/rent a tester from an auto parts store.

 

[epiphaknee]

Think water pump. How many miles are on your engine? How long have you been topping off your coolant reservoir? Of course, check the hoses too, upper and lower rad hoses and the two heater hoses and rad cap. A pressure test will bring these issues to light!