Coolant reservoir problems

Coolant reservoir: Reservoir that contains the refrigerant the engine will use while it is in motion.

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Scared for my Nobel steed🥺

2004 Buick LeSabre Custom 250000 miles

A/c went out last summer, however: ¹fan still blows ²went to charge freon but it was full ³ was at that point I realized fans in front of radiator are not moving.
Currently, it is trying to overheat. I smell it. the digital readout on dash tells me temp (180°-217°f) is "normal". Also, I have what appears to be rust stuck to the inside of coolant reservoir - but doesn't appear to be in fluid. I will post photos soon as it's daylight

JfreakinD from United States 2 years ago

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Same issue here

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Jmor616 from United States 2 years ago

More information is needing on this. You said the AC is not blowing but you checked it and it’s full. How did you check the Freon? You mentioned the radiator overflow has rust on it but it’s not in the fluid to be honest that’s pretty typical but you’re talking about two different systems there. Now the fans not working that’s good as depend upon when you were checking it if you turn the AC on the fan should come on Automatically. To properly check the Freon it really needs to be sucked down a vacuum pulled on the system and then charged with the right amount of Freon using gauges but you can’t just check the Freon to see if it’s full by looking when you turn the AC on look at the AC compressor the front of it is what you call the AC clutch. If the front piece is not turning then it’s not engaging , so you won’t get any cold air now if it’s empty, you won’t get any cold air even if that’s engaging which it probably won’t engage because it’s got to see a minimum pressure. So really a lot more information needs to be posted here before somebody could give you an accurate or somewhat of an accurate things to check. My guess is you don’t have any Freon and if you don’t have any Freon, you probably have a leak because it is a closed system.

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JRA86 from United States 10 months ago

1. JfreakinD’s 2004 LeSabre (Overheating & Frozen Fans)
Problem: Overheating (180°–217°F), A/C is out, and radiator fans are completely still. JfreakinD’s "Noble Steed" is suffering from a classic cooling fan failure. On the 2004 LeSabre, the A/C and the cooling fans are deeply linked—if the fans don't move, the A/C will quickly shut down due to high pressure. The Fan Circuit: There are three cooling fan relays (two 4-pin and one 5-pin) in the under-hood fuse box. If any of these fail, or if a fuse is blown, the fans will stay off, causing the engine to overheat and the A/C to cut out. The "Rust" in the Reservoir: Rust inside the coolant reservoir, even if the fluid looks clear, usually indicates that the internal protective additives in the antifreeze have broken down. This allows mineral deposits and surface rust from the engine block's water jackets to settle on the plastic walls of the tank. Temperature Reading: A readout of 217°F is actually on the high side of "normal" for these engines, as the high-speed fans are typically programmed to kick in around 220°F–225°F. If they aren't spinning at that point, the car is in danger. Recommendation for JfreakinD: "JfreakinD, your fans are the key. Check the Cooling Fan fuses and relays first. If the relays are good, the fan motors themselves may have failed. The 'rust' is likely a sign you need a full coolant flush and refill once the fans are fixed to prevent further corrosion inside the block. "

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