Question about GMC Sierra 1500

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How many ounces of freon for a 99 gmc sierra pickup . the factory label is missing

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  • Pat Kelso Jun 14, 2010

    OVER CHARGING WILL CAUSE PROBLEMS..... THAT'S WHY THEY PUT THE AMOUNTS ON THE VEHICLE LABEL UNDER THE HOOD. I JUST DON'T HAVE ANY BOOKS TO REFER TO '

  • Pat Kelso Jun 14, 2010

    OVER CHARGING WILL CAUSE PROBLEMS..... THAT'S WHY THEY PUT THE AMOUNTS ON THE VEHICLE LABEL UNDER THE HOOD. I JUST DON'T HAVE ANY BOOKS TO REFER TO '

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Get the bigger can, it will only take as much as it needs. If you need more you can always add it later.

Posted on May 30, 2010

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Hello I am looking for a repair manual for 1978 gmc manual.


Depending on how in-depth you want, there are a couple of choices.
Haynes is a good manual and I have several of them.
Haynes at $25 for less in-depth stuff. Still a good manual

GMC C15 Pickup 1975 1978 Repair Manuals


or a Factory manual which shows every nut/bolt/procedure that a factory tech would have access to at $99.
Search Results for 1978 GMC Pickup

Sep 16, 2017 | GMC Cars & Trucks

1 Answer

Need to put freon in ac not sure which valve is the low side one. The one standing up right or the one laying sideways. it is a 1998 gmc 3/4ton sierra pickup 350 auto trans


It is the LARGER hose, and the actual fitting is smaller-your fill hose that comes with your refill kit will only fit the suction (low side) port, so you can't do it incorrectly.

Jun 29, 2011 | 1998 GMC Sierra

1 Answer

I have a 99 gmc Sierra v6, I'm not car savvy at all, how do I go about locating the egr valve and cleaning it?


EGR VALVE IS LOCATED NEXT TO THE TOP RADIATOR HOSE AT THE ENGINE, IT CAN CAUSE ENGINE TO MISS, STALL AND SURGE.

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Dec 14, 2010 | 1999 GMC Sierra

1 Answer

Does the AC use Freon in the 2002 GMC Sierra


Yes it take 134a freon, if system is empty for a full recharge take's 1.76lbs of freon.

Jun 04, 2010 | 2002 GMC Sierra

1 Answer

I have had intermitent missing when it is damp


Cap and rotor, spark plugs and wires.

Apr 14, 2010 | 1996 GMC Sierra

1 Answer

I have a 99 gmc sierra with 5.3 it takes about 7 seconds to start


Needs a valve adjustment. I assume its EFI, eliminating the possibility of the carb.

Sep 04, 2009 | 2000 GMC New Sierra 1500

2 Answers

1998 GMC Sierra Pickup Air Condition will not hold Freon Charge. Noticed Seal missing on valve core...how to replace Or could it be something else . Thanks


This is possible as the cap with an o-ring inside is considered the primary seal and not neccessarily the schrader valve on these service ports. I think alot of problems in this area could be avoided by the use of these caps but for some reason they are not that important to many as they are seemingly always gone,off,missing or not re-installed after services.However,I would not assume this is the only leak therfore system inspection and leak checking is definatley in order. A flouro-dye oil charge that detects leaks quite well under black light and electronic "sniffing" may be a corrective measure at this point and finally once the systems charge is recovered,insure the system will hold full vacuum(near 30 in depending on altitude) for a indefinate amount of time before recharging system to level.

Aug 14, 2009 | 1998 GMC Sierra

1 Answer

99 GMC sonoma will start with starting fluid then


The 99 GMC, when it acts up, check whether it has fuel and/or spark. It could be related to fuel pressure, available electrical power, ignition component/s.

May 31, 2009 | 1998 GMC Sierra

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