My sequoia ac light started flashing and has stoped blowing cold air

Getting your system recharged at a dealership would be recommended but only hot air coming through the front could be an hvac problem, make sure that all your vacuum lines that run to your system are not crushed or unplugged, they will be located in the engine bay of your vehicle.

As per your problem mentioned.There are few solved help links to troubleshoot these problems.Go through the list and Click the link below:----
Air conditioner blows air but not cold air http://repairhelpcenter.blogspot.in/2012/07/air-conditioner-blows-air-but-not-cold.html

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Car overheats and Air blows hot at idle? http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html---------- Hot air on the driver's side vents only? http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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2005 Chrysler PT Cruiser: A/C Blows Warm? http://whoisbyme.blogspot.in/2012/06/2005-chrysler-pt-cruiser-ac-blows-warm.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold? http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold? http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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These will help.
Thanks.

The Sequoia's A.C. is forever a problem,taking to the dealer and spending a few grand is just a temporary fix,and since it's not a driving issue,there is no recall,found a site where a heap of Sequoia owner's all have the same problem as your's,I bought A 2004 Tundra new and sold it a couple of years ago,only had 68,000 miles and had no A.C. issues,so it's only a Sequoia issue,I would sell it instead of sinking a bunch of money into it and it still be problematic.

The most likely culprit is the condenser fan not working. While driving, air is forced through the condenser fins cooling the condenser and all is fine, but when stopped and the fan is not blowing and you notice the air get warm.

low on gas ,,,with two AC units it should hold about 1.4 kgs of gas and i bet your down to around 600gms.You will need a machine to empty gay measure what comes out and then put the correct amount back ,or if you can get them and the adaptor put in two leak sealers which hold a 100gms each and try that

Flickering? or a rythmic on/off flashing?

replace the A/C magnetic clutch relay, its in the under the hood fuse box

orfice tube stoped up or make shure motor electric fan comes on when u cut ur ac on with motor runing

check cooling fan operation while ac on.If fan is working proper,will probably have stuck exspantion valve.

ac needs recharged possible leak