Question about Chevrolet Suburban 1500

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Juice to the A/C relay but not to the compressor. 1999 suburban

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Remove low pressure switch connector and jump contacts
might be another bad switch or low on 134a

Posted on Jun 27, 2009

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1 Answer

1999 Suburban fuel pump relay


Did someone check the circuits for the relay to see if it is getting power from the key switch and ground from the computer ?
The computer grounds the relay for 3 seconds when the key switch is turned on to boost pressure until the engine starts.

Dec 15, 2012 | 1999 GMC Suburban

1 Answer

I have a 1999 suburban 5.7 and the the a/c compressor will not shut off. The only way I can get the compressor is shut off is to pull the relay under the hood. The relay is energized I know this because...


Sounds like a bad switch or button. Poke at the button with the back of a writing pen...My button wasnt working due to spilling coffee on it..You know like at the gas stations...the most used buttons go out first..Just something to check..Good luck

May 10, 2017 | 1999 Chevrolet C/K 2500

1 Answer

1999 chevy suburban. the ac compressor doesn't engage. could it be a relay or is the compressor bad?


hi.
it is possible for either to be faulty, but it far more likely to need regassing.
there is a pressure switch in the freon system that will prevent the A/C clutch engaging if the pressure is too low.

i would get the refrigerant checked and topped up before starting to worry about anything else.

Apr 17, 2011 | 1999 GMC Suburban

1 Answer

AC compressor will not turn on, and will not blow


open fuse panel under hood and check the AC Comp fuse. If it blows again you may need a new compressor

Apr 10, 2010 | 1999 GMC Suburban

1 Answer

I have a 1999 silverdao 1500 i have juice going to the fuel pump relay and no juice to the pump it wont start


The relay has power on 2 terminals not just one. the relay uses a smaller current to control a larger current...Apply 12 volts to the grey wire aka battery positive and see if the fuel pump will run. if it does ,Check all fuses. and check operation of the fuel ballance module.

Mar 17, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

99 Suburban A/C Not working


The A/C pressue switch may be bad as well. Also the mode switch on the control head inside the vehicle. There are many other exsisting problems pertaining to a/c. I suggest a manual from Auto Zone for many faults can be noted especially wiring can be at fault

May 23, 2009 | 1999 GMC Suburban

2 Answers

A/C sporadic compressor. Bypassed high and low with paper clip. Pressures good has Freon. Clutch tests OK. Vehicle runs for maybe 10 min or some times 30 then A/C shuts down. Maybe A/C will fire up...


This is just a suggestion but you should check to see if you have a thermostatic control switch in your evaporator this could be the cause if the intermittent problem.The switch is actually used tokeep your ac from freezing up i believe.

Jul 24, 2008 | 1999 GMC Suburban

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