2020 Chevrolet Silverado 1500 (T1XX) · Known Issue
2020 Chevrolet Silverado 1500 Weak A/C (Condenser Internal Bypass): What It Really Costs to Fix
Quick answer: 2020 Chevrolet Silverado 1500 weak a/c (condenser internal bypass) typically costs $550 to $1,200 at an independent shop, depending on which component failed.
Applies to: Built in Silao (VIN 11th character G). Other versions of the 2020 Chevrolet Silverado 1500 do not have this problem.
What the Issue Is
On this Silverado 1500 and its Sierra twin, GM's documented A/C defect is not a leak. Bulletin PIT5767, first issued in 2020 and revised in 2021 and again in July 2026, covers trucks built in Silao, Mexico (an 11th VIN character of G) whose condenser has an internal block-off plate that was out of position from the factory, and its latest revision takes in 2019 to 2026 models. Refrigerant then bypasses part of the condenser instead of flowing through its cooling fins, so the system cannot shed heat: the A/C blows weak or warm, sometimes mostly on the driver's side, and both low-side and high-side pressures read below normal.
The trap is diagnosis. The system is fully charged with no leak, so a shop that checks the charge, adds refrigerant or hunts for a leak finds nothing, and the truck goes home still blowing warm. The bulletin's tell is temperature: the lines into and out of the condenser both read very hot while the condenser fins stay near outside air temperature. The fix in the bulletin is a new condenser. There is no recall and no special coverage for it, so outside the 3-year/36,000-mile bumper-to-bumper warranty it is a paid repair.
Leaks can happen on any A/C system, but GM's leak bulletin for the previous truck, 18-NA-156 (a receiver/dehydrator plug), covered 2017 and 2018 builds, not these trucks. For a buyer, the screening is a vent thermometer, a side-to-side comparison of the left and right vents, and a VIN check: an 11th character of G means a Silao-built truck the bulletin can apply to.
Symptoms to Watch For
- 1.A/C blowing cool but not cold, or warm, with a full charge
- 2.Weaker cooling from the driver-side vents than the passenger side
- 3.Low readings on both the low-side and high-side gauges
- 4.Condenser inlet and outlet lines both very hot while the fins stay near outside temperature
- 5.Recharges or leak searches that find nothing and fix nothing
Real Repair Costs
Independent-shop pricing for a new condenser with evacuation and recharge, the bulletin's repair. Dealer pricing runs 30 to 50% above. Inside the 3-year/36,000-mile bumper-to-bumper warranty it is a warranty repair.
| Repair | Typical Cost (installed) |
|---|---|
| Condenser replacement + evacuate and rechargethe bulletin repair | $550-$950 |
| With OE-part premium / added access labor | $750-$1,200 |
| Diagnosis (pressures and line temperatures) | $100-$200 |
Moderate issue. Ranges are US independent-shop estimates with quality parts. Use them as negotiation grounding, not a quote.
Mechanic's Tip: Spot It Before You Buy
Run the test the season cannot hide from: engine idling, A/C on max with recirculation, a $10 thermometer in a center vent for five minutes. 38 to 48°F passes; mid-50s or warmer fails, in January as reliably as July. Then move the thermometer between the far-left and far-right vents, because this defect can show up as a weaker driver side. Read the VIN: an 11th character of G is a Silao-built truck that PIT5767 can apply to. If the seller says a shop recharged it or found no leak and it still blows warm, that fits this bulletin, and an invoice for a replacement condenser is the fixed version.
The Bigger Ownership Picture
Beyond this specific issue, budget roughly $1,100-$1,600 per year for scheduled maintenance and repairs on a 2020 Chevrolet Silverado 1500. That is a typical US range from Avturo's ownership-cost table, an estimate rather than a quote, and it excludes insurance, fuel, and financing.
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Frequently Asked Questions
Why does my Silverado A/C blow warm when the charge is full?▼
On Silao-built trucks (11th VIN character G), GM's bulletin PIT5767 describes a condenser whose internal block-off plate was out of position from the factory, so refrigerant bypasses the cooling fins. The system is full and leak-free, pressures read low on both sides, and cooling is weak, sometimes worst on the driver's side. The bulletin's fix is a new condenser.
What does the condenser replacement cost?▼
At independent shops, about $550 to $950 for the condenser with evacuation and recharge, stretching toward $1,200 with OE-part premiums or extra access labor; dealers run 30 to 50% higher. Inside the 3-year/36,000-mile bumper-to-bumper warranty it is a warranty repair.
Does GM cover the Silverado condenser problem?▼
Only through the normal warranty. GM handles it with bulletin PIT5767, which applies to Silao-built trucks and was revised as recently as July 2026; we found no recall and no extended coverage for it. Outside the factory warranty the repair is out of pocket, so check the VIN's 11th character and the A/C repair history before you buy.
Can I just recharge the A/C instead?▼
Not for this defect. The system is already full, so adding refrigerant overcharges it without fixing the bypass inside the condenser. A recharge or leak search that finds nothing on a Silao-built truck with weak A/C points to this bulletin, and the repair is a new condenser.
Sources
The facts on this page were last checked against these documents on October 10, 2026. Programs and their coverage end; check the car's VIN with a dealer for what still applies.
- Service bulletin: GM bulletin PIT5767, condenser internal bypass on Silao-built Silverado and Sierra 1500 (2020, NHTSA copy) (static.nhtsa.gov)
- Service bulletin: GM bulletin PIT5767B, July 2026 revision (NHTSA copy) (static.nhtsa.gov)
- Service bulletin: GM TechLink: Poor Driver's Side A/C Performance (gm-techlink.com)
- Service bulletin: GM TechLink: Loss of A/C and Warm Air Conditions (gm-techlink.com)
- Service bulletin: GM TechLink: Low Air Conditioning Refrigerant Charge or Leak (bulletin 18-NA-156, previous-generation trucks) (gm-techlink.com)
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