92 Lesabre Limited overheats

[bigbuick79]

hey guys, my car starts to overheat after about a month of driving. I refill it with coolant and it drives alright. I tested for a coolant leak, the mechanics said there was none, and the coolant system maintained good pressure. but this time, i put coolant in, and the temp never went down? could it be my theremostat, cause anyway, i was thinkin, i shouldn't have to change my coolant every month! any help will be appreciated.

Thanks

[jase386]

the thermostat could be clogged with trash, or just old and stuck closed and not letting enough water thru.

[Loekee75]

Are you saying that you're loosing coolant? A faulty thermostat will not cause coolant loss.