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When the air conditioner in your 2003 Lexus GX470 starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system. Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a refrigerant. The A/C system in your GX470 consists of a compressor that is belt-driven, an evaporator and freon. If there is a problem with your compressor or evaporator, adding freon will not restore cooling. How to add freon to your 2003 Lexus GX470: hook up the can of refrigerant (likely r-134a) to the low pressure port. When your compressor kicks on, add freon to the correct pressure. In addition to cooling, freon lubricates the compressor when it runs.
If your brake fluid is a little low, learn how to add some here. Ignoring a low level leads to big problems2003 Lexus GX470 4.7L V8
The best way to fix leaking hoses is to replace them, but if you don't have time, a stop leak product might work for you2003 Lexus GX470 4.7L V8
Did you know that heat is worse for your battery than cold? Replace it every 4 years2003 Lexus GX470 4.7L V8
Coolant hoses wear out over time and need to be replaced - check 'em early and often2003 Lexus GX470 4.7L V8
If your car is leaking a small amount of power steering fluid - see this video on how to fix the leak2003 Lexus GX470 4.7L V8