GM Parts Club
Most cooling system problems announce themselves well before they strand anybody. On a 2019-2025 Sierra 1500, these are the ones worth acting on.
1. Having to top off the surge tank more than once a year
By the time this is obvious you are generally replacing more than one part. Start by looking at coolant hoses.
2. A heater that blows cool at idle and warm at speed
This is the symptom people put off longest and regret most. Start by looking at coolant hoses.
3. Crusty orange residue around a hose clamp or the surge tank seam
This is the symptom people put off longest and regret most. Start by looking at coolant hoses.
4. The sweet smell of coolant after shutdown with no visible puddle
This is the symptom people put off longest and regret most. Start by looking at thermostats.
What to Do Next
GM’s long-life coolant is generally rated for 5 years or 150,000 miles on the first fill and 5 years or 100,000 miles after that. Hoses and the surge tank should be inspected annually once past 80,000 miles.
Engine, tow package and rear-A/C content all change the radiator and hose part numbers. Have the VIN ready.
Genuine GM parts, dealer priced, shipped from Dallas. our GMC OEM parts catalog has the full catalog, or search for Sierra 1500 radiators.
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