Question about GMC Sonoma

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Where is the coolant drain plug on a 2003 sonoma?

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On the bottom of the radiator ??

Got to look for it.

Should be a plastic wing nut you can see.

May have to reach down or remove shields
and get from bottom

Posted on May 23, 2011


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1 Answer

How to change radiator drain plug

Simply loosen the old one in the radiator to let the coolant run out. After the radiator is empty, pull the old drain cock out of the radiator and install the new one. Tighten the new one up firmly and refill with coolant. Let the engine run to reach normal operating temperature and check for leaks.

Jul 09, 2014 | 1991 GMC Sonoma

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2000 gmc sonoma 2.2l

Most radiators have a drain valve or plug on the bottom. If your radiator does not, you would need to remove the lower radiator hose to drain the coolant.

Jun 11, 2013 | Cars & Trucks

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Do I need a tool to drain the radiator on a 2003 GMC SONOMA

There is a drain at the bottom of the radiator. Be careful, it is plastic, just turn it gently to the left. It wont be on the bottom of radiator, but bottom, of face facing engine. Recommend to remove radiator cap, coolant will flow much faster

Nov 29, 2010 | GMC Sonoma Cars & Trucks

1 Answer

How do I drain the coolant in a 1998 GMC Sonoma?


Open the bonnet of your 1998 GMC Sonoma, look under the radiator, you will see a hose/pipe coming out of the radiator going into the engine of the 1998 GMC Sonoma. Remove the hose and the coolant will drain.

You will see a screw holding the hose to the engine, get a screw driver to loosen the screw so that the hose can be easily removed.

After draining, pour more water into the radiator to flush out the coolant entirely from the radiator.

I hope this helps.

Good luck.

Nov 24, 2010 | GMC Sonoma Cars & Trucks

1 Answer

Draining old coolant how does the drain plug work on radiator can'nt get it to move.

it works like any tap ----anti clockwise to open it . if you cant get it to move , remove the bottom radiator hose .

May 04, 2010 | 1994 GMC Sonoma

1 Answer

How to change the thermostat

drain the coolant down, remove upper radiator hose from motor,remove thermostat housing. remove thermostat.replace it.note the position of the thermostat,be sure to put it back in the correct position. replace housing, hose, coolant.

Mar 14, 2010 | 2003 GMC Sonoma Extended Cab

3 Answers

Where is the engine coolant drain bolt on a 2003 2azfe camry? i found the radiator drain but can't find the engine drain plug-a photo would be great

The textbook method is to remove the drain plug on the bottom of the radiator.

Most drain plug is make of inexpensive nylon/plastic and it may fall apart while you turn it.

The professional method is to loosen the lower radiator clamp and drop to lower radiator hose.

Drain the coolant onto a large drain pan and recycle the coolant


I just did a FREE write up on air purge from coolant system and how to detect initial state of blown head gasket at the Fixya tip selection.

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or follow link below.

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2 Answers

Can not find drain on radiator of a 2003 gmc

It should be there. Just look hard under the radiator back-side wall, or directly under the radiator.

Nov 14, 2009 | 2003 GMC Savana

3 Answers

I want to drain rad on 03 gmc sonoma ,How is the

As you are turning left, pull on the plug, use pliers. it should pull out maybe 1/4 turn.

Oct 28, 2009 | 2003 GMC Sierra 1500

1 Answer

How do i install block heater in 91 2wd 4 cyl sonoma

Hi ryan, yes my friend the best bet is to drain the coolant,as for the block heater,not sure which side for the sonoma but basically it is a frost plug with and internal element attached to it,once you unplug the cord typically there will be a small screw to remove, use a small punch or whatever will work and pop one side to roll the block heater so you can remove it,simple my fried,by the way a new block heater will come with installation instructions :) have fun and good luck ryan take care.

Nov 13, 2008 | 1991 GMC Sonoma

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