Aircondition help

Hey there all,
My a/c turns on and is freezing cold, but in a few seconds later the light for the a/c blinks on and off and then my air starts blowing hot air? I bought a new a/c compressor rpm lock sensor and installed it yesterday. Sucked out freon and recharged it. Guess what it didn't work? What else can I do to fix this problem? The compressor is fairly new and it does give cold air when its turned on but like I said it starts to blink off/on then cold air is gone. This is so weird??? Help please????

 

My guess is the high pressure switch could be cutting it off. Evacuate again and check the expansion valve/tube to see if it’s clogged.

 

Ok thanks, I will try that... Does anyone know where the a/c relay is located?

 

where is the a/c relay located in a 2005 toyota tundra sr5?

 

There is no AC relay, they use a Heater Relay to accomplish HVAC and it's located in the Engine Bay. Since your A/C is working sometimes, either the HTR relay is flaky or there is another issue.
How much freon or what procedure did you use to determine enough freon ? What pressures are you seeing when it is working ?

 

Thanks BubbaW,
I will test the relay and try the high pressure switch. Thanks I hope something works.

 

THE HIGH SIDE IS AT 200 AND THE LOW SIDE WHEN IT DOES KICK IN IS AT 40?
SO THE READINGS IS RIGHT BUT it still turns (off and on) so frustrating.

 

Where did you buy your compressor, what brand is it? OEM or aftermarket? (It makes a difference)

Look at this thread, 1st pic. Check that the CABLE for the part tagged "TIGHT?" is actually tight on your truck. That's where the AC compressor is pulling ground. https://www.tundras.com/threads/a-c-blinking-light-over-pressurized-bad-ground.110897/

You may notice his symptoms are similar to yours.