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Hello to all

We have a 2007 Chevy Malibu 75,000 Miles on it

We use the proper antifreeze for it

We have to refill the antifreeze every month, it's always well below the minimum line, and makes a gurgling sound

No evidence of a leak, no smell, nothing on the ground, floors are dry

The engine doesn't seem to be running hot, temp gauge seems to be working

Please help me. Thank you very much!  

you did not say which motor...

there might be a TSB on that...

you can check directly over at alldatadiy.com

lower right corner of their web page.. titles are free.

does the system hold pressure.?????

when i find a cooling system that gurgles... its usually the radiator cap is failing to hold pressure.. the system has to hold 13 or 14 pounds of pressure..

i have had other cars that failed to hold pressure... and would blow the coolant out of the overflow tank...

there are also bleeder screws on many models... letting out the trapped air from high spots in the cooling system...  

Hello, thank you. It's the 3.5l v6  

Also I took it to firestone and they said it is holding good pressure  

change the radiator cap for a new one....




here is an image of all your radiator cooling system hoses...





here is a detailed image of the heater hoses...

 

here is an image of the water pump end of the motor...

 

The coolant is going someplace.  It isn't going on the ground.  If it was dripping from the radiator cap, you'd smell it, or see it.

What does your oil look like?  What does your exhaust smell like?  What do you get when you wipe your finger on the inside of your exhaust pipe?

It's going someplace, figure out where, and you can identify the problem.  Head gasket, cracked head, and cracked block are all possibles.