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99 Ls400 Ac Not Cold During 95+ Degree Days

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Hi everyone my Lexus has been serving me well I love this car. I miss my 94 but my 99 is spiffied up with a new touch screen Navi Bluetooth radio and I installed a jl audio jx400 watt amplifier and the stock speakers sound great. Getting to the problem though my ac works fine if it's around 80 or 85 degrees. I recharged it with a kit from auto zone and checked the pressure with a gauge and it seems to be in the green. During those 95 degree mid day ventures the ac blows semi cold but no where near as cold when the Temps are in the 80s. Any ideas? Thanks in advance

Joel

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My AC takes a lil while to really cool on hot days but maybe you have other problems if you had to recharge it yourself.

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It didn't need much. Just half of a tiny can. I don't think it's leaking because it's steadily cold during low 90s. I cleaned the cabin filter out it was filthy that helped a lot.

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If your AC output is 30 degrees below outside temperature, things are fine. Just use your imagination to remember last winter and things will chill. Put a thermometer in the outlet and test. 100 degrees outside means 70 degree air inside. Anything beyond that is a bonus. I guess you can also only rate the output on a longer trip. Short trips don't count since it takes the physical interior a long time to cool down. Also the color of the car makes a huge difference. Black=Hot,

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It's beige with beige interior. The ac definitely doesn't cool at 70f when it's 90. My house is on 80 and it's cooler than the lexus interior on those near 100 degree days. But when it's 85 or 90 it's pretty good it works pretry well. I've cleaned the cabin filter leaves off the vents and sprayed the condenser down. I'm wondering if the expansion valve is bad? Sorry I'm new to hvac not really my speciality.

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More likely a low charge. When the freon gas gets a little low, the temperature output increases. Doubt it is the expansion valve as they are just a component.

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After cleaning the Condensor off and getting the leaves off the vents near the bottom of the windshield it's doing better. I don't think it is low on freon because I accidently over charged it (I know stupid mistake) and the compressor clutch would stop spinning. So I took some out till the clutch was moving again and since I've done all that it's working better. Also parking under the shade helps. Thanks everyone for the replies love this forum.

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I would also make the sure the cabin air filter is not clogged. It can accumulate a lot of fine dust as well as the obvious leaves and stuff. Try running the A/C with the cabin air filter removed - does that make a difference? If so, replacement filters are not too expensive.

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I was appalled at how much debris was in the cabin filter it all fell out after I shook it but there was quite a bit. I will check it again today and see if there is any more obstructions however just shaking it out did the trick. I do believe there could be debris still in there though and I wouldn't want it going in my glove box. It's working better though now with the suggestions everyone has provided. Thanks for the reply.

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It needs more than a shake - best to blast it (carefully!) with an air line to get all the dust out (there will be LOADS). As I say, if removing the filter makes a noticeable difference to air flow and temperature (it did in my Mk IV), then replacing it is indicated.

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