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Adding engine coolant (also known as antifreeze) to your 2003 GMC Envoy is pretty easy. Engine coolant circulates through your engine to keep it cool in the summer but won't freeze in the winter. Make sure to check your engine when it is cold for an accurate reading. The video above shows you where the coolant reservoir in your Envoy is located and how to add coolant. Be sure to check your owners manual to determine the correct type of fluid to add - for GMCs, it will typically be in a section titled Fluid Capacities in the back of your manual. Mix the coolant with distilled water so that you have a combination of 50% coolant and 50% water. Some coolants will come premixed...that is, you don't need to add any water. These coolants will typically say 50/50 or pre-mixed on the front of the coolant bottle.
Removing the coolant reservoir cap on a warm engine could cause the cap to fly off at a high rate of speed and fluid to spray out of the reservoir. Always wear safety goggles when working on your Envoy. Promptly wipe up any spilled fluid as it is highly toxic. Animals love its sweet taste, so even a spilling a small amount on your garage floor can end up in the dog's stomach pretty quickly. If you notice an oily surface in your coolant, immediately have your mechanic inspect your Envoy for head gasket leakage
Small bulbs that burn out regularly - did you know you can replace these with LED lights?2003 GMC Envoy SLT 4.2L 6 Cyl.
If your blinker doesn't blink, or blinks rapidly, you likely have a burnt out bulb2003 GMC Envoy SLT 4.2L 6 Cyl.
Burnt out brake lights increase your chance of getting rear ended - check and change yours today2003 GMC Envoy SLT 4.2L 6 Cyl.
White light when you back up - yup, they burn out and you can replace them with bright LEDs2003 GMC Envoy SLT 4.2L 6 Cyl.
Sure you can take it in for a $19 lube, but are you OK with a stripped oil pan and cheap parts in return?2003 GMC Envoy SLT 4.2L 6 Cyl.
On many cars, the high beam bulb runs at reduced power during the day - check 'em and change 'em!2003 GMC Envoy SLT 4.2L 6 Cyl.