Question about 2003 GMC Sierra C/K3500

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My block heater in my 06 gmc 5500 6.6 keeps blowing my GFI outlet i changed the plug end on the truck but it's not that any help would be appriciated

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SAY GOOD BY TO THE GFI REPLACE THE GFI WHEN WINTER IS OVER . USE A STANDER RECEPTACLE FOR NOW. SOUNDS LIKE IT NEEDS TO BE ON THE ROAD TO PAY FOR THAT TRUCK .. IF THE BLOCK HEATER IS EASY REPLACE IT IT MAY BE SHORTED BUT WILL STILL HEAT.. USE A OHM METER ONE LEAD ON THE BLOCK AND ONE ON THE PLUG

Posted on Jan 31, 2010

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Posted on Jan 02, 2017

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My 99 GMC sonoma with a 2.2L is not warming up properly


Possibly plugged or inerporable heater core. Possibly heater core valve (this diverts hot air through your heater system) When you flushed the block, was there a lot of contaminant? 95% of the time, cold heat means thermostat. Also there are a lot of really cheap after market thermostats, you can buy one as low as $6.00. That being said, just because a thermo is new doesn't necessarily mean it opens/shuts when it should. You can look on You Tube on how to test one in your kitchen with boiling water,.

So three basic things affect interior heat temps. Thermostat, plugged heater core/.valve, and insufficient coolant or liquid to tranfser heat. If your interior coolant (engine temp) is working normally and your vehicle reaches operating tempature according to the needle, your thermosat is probably not the cause.

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1 Answer

No heat 06 sonata only blows cool air


it most definitely is your blend door. It's a bit of a hassle but in the end it doesn't cost anything but a sore back/neck and hands. Take your time. remove glove compartment, and you'll see the blend actuator. I unplugged mine as it was stuck in 'cold' mode. after re-plugging it worked again and has been fine since.

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Can you take off the 2 lines going into heaTER CORE AND BLOW THEM OUT WITH A AIR LINE WILL THIS WORK?


Yes you can blow through a blocked heater with air and it should work,dont blow too hard in case the core is weak and starts leaking,and make sure that you try and seal the end where your blowing for the air to not leak back at you so you have enough pressure,should work fine

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1 Answer

Can some post the 1999 gmc sierra wiring diagram


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1 Answer

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You have a short to ground or the pump is starting to go bad. You can run a seperate wire from the hot side of the fuse to your pump to see if it is the pump or if you use an ohm meter to check the wire and the pump. Get's a little technical though.

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1 Answer

Block Heater not working


There is no fuse on a block heater. It is an extension cord with a resistor (element) on the end (see photo. If it not working, the resistor (coil) has failed. A new block heater is required.
Before replacing, however, check the outlet and/or beaker the outlet is on to see if it has tripped.
b582a38.jpg I too live in s/e Michigan, and it was -19 this am. No block heater can keep up with these extreme temps.
:)

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1 Answer

When I plug in the block heater it is blowing the ground fault.


evither the cord on the heater has a short in it or the heater itself is shorted ....basically like a waterheater element

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