Question about 1994 GMC Sierra

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Some kind of oily coating inside of truck on windshield, 1994 gmc sierra stepup style, where are the air conditioner hoses? is it hard to fix this leak?

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Sounds like the evaporator core has sprung a leak. On a scale of 1 to 10 this one has a 6 rating on difficulty.

Posted on Jul 31, 2010

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2000 gmc sierra air conditioner, wipers and dash lights have stopped working. Fuses checked and are fine. Nothing registers when checked. Battery light on too. Any solutions


it look like low battery.. have voltage battery check
then alternator if charging while running headlamp on are not white but kind of yellow.
meaning alternator not charging

Oct 07, 2013 | 1997 GMC Sierra

1 Answer

99 GMC Sierra 4.8 1/2 ton 2 wheel drive new body style ac does not blow cold air from the front vents on the dash? Still get some cold air from bottom by floor vents,


if both vents are blowing air in general then you may need to get your air conditioner recharged, but if the front vents aren't blowing at all then you may just have a jammed vent flap and you can fix that from under the hood next to the blower motor. check you rowners maual for the exact location

Jul 01, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

Oily coating inside of windshield


Coolant will be orange or green in color
Freon evaporates although if an AC leak a slick oil can appear

Jul 31, 2010 | 1994 GMC Sierra

1 Answer

What is the round perforated disk above the driver in a 03 gmc sierra 2500 it is about the size of a toonie .....


Inside air temperature sensor? Does your Sierra have automatic temperature control for the heater/air conditioner?

May 21, 2010 | 2003 GMC Sierra 2500HD

1 Answer

1994 gmc seirra k1500 4.3 engine 4x4 hesitation when I accelerate.


check vacuum lines, near air canisters and air filters etc, usually rubber hoses, may be cracked ,split, dry rot enough to let air in. may as well start there.

Apr 22, 2010 | 1994 GMC Sierra

1 Answer

My 94 gmc sierra has no heat, new heater core and blower works, also has new termostat...any suggestions?


You Might want to Check your Heater Control Valve,Its located under your Hood between 1 Heater Hose and your Water Pump.Its Vacum Operated and could be manual as well.Have someone turn your heat on and Off while you watch under the Hood at the Heater Control Valve to See if you see it Move.Or could have a Leak.More than Likely its Frozen Closed not allowing the Hot Water to Run Through Your Heater ore ,Which Results in No HOT AIR blowing inside. Try This 1st.

Mar 01, 2010 | 1994 GMC Sierra

1 Answer

My Air Conditioner in my 1994 GMC Sierra V6 Truck is blowing air that is not cold and on hot days it will blow hot. I was going to recharge the freon and i bought a can with a guage on it and the low...


I BROUGHT A 94 SIERRA, THAT WAS IN A ACCIDENT. THE DOOR WON'T LINE UP, EVEN WHEN I ADJUST THE BOLTS. IS THERE ANY OTHER WAY THAT I CAN LINE IT UP?

Apr 16, 2009 | 1994 GMC Sierra

1 Answer

How do you vent air from the heater hoses?


take youre hose to your air conditioner and sut the take a cap like you use for pluming and rubber cement the cap on. thenwhen you get youre heater fixed all you have to do is take the cap of with channel locks

Jan 18, 2009 | 2000 GMC New Sierra 1500

1 Answer

01 gmc truck 1500 2wd oder of antifreeze inside cab


the small radiator just inside the cab, where the hoses go to the heater is leaking. You may try using stop leak (many don't recommend this) or take off the heater radiator. it will probably get worse when you turn on the heater and fog up the windshield if not fixed. hope this helps.

Nov 07, 2008 | 2001 GMC Sierra C/K3500

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