• Two metal car AC refrigerant service valve caps, one blue and one red, on a gray background
  • Blue car AC service valve leak repair cap on grey background
  • AC service valve cap with red and silver metal parts for car air conditioning repair
  • Close-up of blue and red automotive AC refrigerant valve caps on a dark background
  • Close-up of blue and red car AC refrigerant service valve caps on a dark background
  • Close-up of car AC service valve caps, red and blue, on a vehicle engine bay
  • Close-up of car AC service valve with red and blue cap for refrigerant leak repair
  • Close-up of car AC service valve with blue cap for refrigerant leak repair
  • Gloved hand holding a car AC service valve and cap for refrigerant leak repair
  • Man in black gloves repairing car AC under hood, vehicle maintenance in garage
  • Gloved hand applying AC refrigerant leak sealer to car engine service valve
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FreezeCap™ – Instant Snap-On A/C Leak Sealer

FreezeCap™ – Instant Snap-On A/C Leak Sealer

Stop Car AC Valves Leaks in 30 Seconds—Without Tools, Shop Visits, or Costly Refrigerant Top-Offs

$97.00 USD
$119.99 USD $97.00 USD
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Refrigerant Type (Select Your Vehicle's System)
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Description

FreezeCap™ is a precision-machined cap. By clamping directly onto the A/C service port valve stem, it creates an airtight, secondary seal to help stop valve leaks.

Package Contents

Each FreezeCap™ unit includes two caps—one red (high-side) and one blue (low-side)—designed to seal both A/C service ports in a single purchase.

How to Install

  1. If needed, have the A/C system professionally recharged by a qualified technician to meet manufacturer spec.
  2. Snap FreezeCap™ straight onto the port until you hear a satisfying click.
  3. Twist the top dial clockwise until hand-tight to engage the internal seal.

Done in 30 seconds. No tools required.

External service-port use only. Installation by EPA §609-certified A/C technician or qualified professional recommended. Wear ANSI Z87.1 eye protection & insulated gloves. DO NOT vent refrigerant — federal penalties apply. Refrigerant release can cause frost-bite or eye injury.

Fit Guide

FreezeCap™ is available in two distinct models—one for R-134a and one for R-1234yf systems.

Select the correct model based on your vehicle's refrigerant type:
🔵 R-134a Model

  • Fits ⅜-24 UNF service ports
  • Common on most vehicles from 1996 to ~2016
  • Still used on many trucks, vans, and older systems


🔴 R-1234yf Model

  • Fits M12×1.5 service ports
  • Found on most 2017+ vehicles
  • Required by law on newer models in many regions


Not sure what system your vehicle uses?
Check the sticker under the hood or your Owner’s Manual for refrigerant type:
Look for either R-134a or R-1234yf.

Lifetime Warranty

If FreezeCap™ ever fails to hold its seal at the service port due to a defect in materials or workmanship, we’ll replace it—for life. We're confident our product will stand the test of time.

Shipping & Returns

📦 Fast Shipping
Orders ship within 1 business day from our U.S. warehouse.
Standard delivery generally takes 2–5 business days depending on location.
You’ll receive tracking info as soon as your order is received by the shipping carrier.

↩️ 30-Day Returns
You may return your FreezeCap™ within 30 days of delivery if it’s unused and in original packaging.
To request a return, email us at support@freezecap.com with your order number.
Return shipping costs are the buyer’s responsibility unless the item is defective.

🔁 Free Replacement for Verified Defects
If your FreezeCap™ fails due to a manufacturing defect, we’ll replace it under our lifetime warranty.

Still have questions? Contact us any time—we’re here to help.

AC service valve tools and gauge on wooden workbench for car AC leak repair

Before you replace the line or refill again—read this first.

Car owners often overlook the tiny service-port valve, even though it’s a common source of A/C leaks.

Mechanics and dealerships may recommend replacing the valve or the entire AC lines—repairs that can work, but often cost hundreds to nearly $2,000.

And in some cases, replacing the valve can damage the threads on the line or fail to fully stop the leak.

FreezeCap™ puts YOU back in control by instantly sealing this common leak—in seconds.

How It Works

  • Gloved hand applying AC refrigerant leak repair tool to car service valve under hood

    Refill.

    Professionally recharge your refrigerant. System pressure is restored so you can verify the repair.

  • Hand with black glove attaching AC refrigerant valve tool to car air conditioning line

    Snap.

    Press FreezeCap™ onto the port until you hear that satisfying click. This locks the FreezeCap™ onto the service port.

  • Gloved hand repairing car AC refrigerant service valve under the hood

    Twist.

    Rotate the top dial clockwise until hand-tight to create an airtight seal against the top of the port. Then enjoy cold air!

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Installation

Close-up of car AC service valve with red and blue cap for refrigerant leak repair

Why Drivers Choose FreezeCap™

  • Designed, Engineered, and Assembled in the USA 🇺🇸
  • Easy Install: Snaps on in seconds—no tools or special training required.
  • Saves $$$: Helps reduce costly repairs (up to $2,000) and repeated refrigerant top-offs for valve specific leaks.
  • Eco-Smart: Helps contain refrigerant leaks—minimizing environmental release.
  • Mechanic-Tested: Built to professional standards with feedback from real techs.
  • Diagnostic Power: Still losing refrigerant after installation? You’ve ruled out the valve—and narrowed down the real issue.

FAQ

Does it really fix existing leaks?

FreezeCap™ forms a secondary, external seal that seals port leaks in seconds. FreezeCap™ however, will not fix damaged lines or other A/C parts.

Will it fit my car?

If your vehicle uses R-134a or R-1234yf (almost every passenger car 1996-present), the included caps fit. Refer to your vehicle's Owner Manual if you’re unsure.

Can I still recharge my AC later?

Absolutely. Just pop FreezeCap™ off, recharge, and snap it back on.

Is it safe for hybrid & EV systems?

Yes. FreezeCap™ seals the mechanical port only—it doesn’t interfere with electric compressors or POE oils.

What if my system has multiple leaks?

FreezeCap™ creates a secondary seal over the port valve leak. If other components (hoses, evaporator, condenser) are compromised, those will still need repair.

How long will it last?

FreezeCap™ is made out of high quality materials and is designed to outlast the lifetime of the vehicle. Plus, it’s covered by our Lifetime Warranty.