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Compressor? Clutch?, or....?

jeckel7234 on Wed August 10, 2011 9:31 PM User is offlineView users profile

Year: 2005
Make: Toyota
Model: Tacoma
Engine Size: 4.0
Refrigerant Type: R-134
Country of Origin: United States

Hi, the is my first post, and hopefully i can get some help here,

My 05 Tacoma, is not blowing out cold air. When i hit the A/C button theres a loud screach noise for about 5-7 seconds, then is stops. and my A/c button led light starts flashing. I crawled under the truck to see if the compressor is seized, with the truck off a spun the front of the pulley wheel, there was some tension throughout the spin, but it did spin. I believe the noise was from the belt slipping on the pulley when the A/C is engaged., i checked the low pressure freon level and it reads high at 100psi and when i hit the a/c button it drops down to about 93 psi and then goes back up to 100psi after the noise stops, Does anybody have some better trouble shooting ideas, My belief is the compressor is bad due to the pressure not dropping when the a/c button is hit, and that the clutch does engage for the 5-7 seconds and then i believe disengages,(i saw it move back out without the button being hit, and then the noise stopped) and when/if its the compressor, when i change it do i HAVE to change the drier or can i just seal the line ends as soon as i take them off?
Thanks again for any information

05 Toyota Tacoma 4.0

JJM on Wed August 10, 2011 10:11 PM User is offline

The light is flashing because the sensor is detecting what appears to be impending seizure. If you're lucky, the it could just be the belt stretched and/or the tensioner is weak, but often it's a sign the compressor is headed for oblivion.

Has the system ever been recharged?


When considering your next auto A/C purchase, please consider the site that supports you:

GM Tech on Wed August 10, 2011 10:21 PM User is offline

Ditto on the flashing a/c button light-- bad news...compressor is locking up or clutch is need to get under it and understand what happened- see if clutch (and compmressor) turns by hand...which I doubt-- probably ran too long on too little refrigerant-due to unknown leak.. so lack of lube causes compressor to dry out and lock up......

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

jeckel7234 on Wed August 10, 2011 11:16 PM User is offlineView users profile

I don't know when/if the system has ever been recharged, but when the clutch engages does it normally disengage or move after about 5 seconds, and if it was a loose belt wouldn't other systems have problems too, ie power steering
Thanks again

05 Toyota Tacoma 4.0

mk378 on Thu August 11, 2011 12:35 AM User is offline

The system has detected that compressor rpm did not reach the expected level, and locked out the compressor. Normally the compressor will stay engaged for longer than 5 seconds.

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