---
product_id: 28481758
title: "ComStar A/C Zero Leak, Fluorescent Yellow 4 Oz, Permanent \"Stop Leak\", Non-Polymer Formula for Automotive, Commercial & Residential HVAC, Prevents Clogs, Compatible with All AC Lubricants (90-700)"
brand: "comstar"
price: "RM235"
currency: MYR
in_stock: true
reviews_count: 6
category: "Com Star"
url: https://www.desertcart.com.my/products/28481758-comstar-a-c-zero-leak-fluorescent-yellow-4-oz-permanent
store_origin: MY
region: Malaysia
---

# Eco-friendly & non-toxic Stops leaks instantly Compatible with all A/C oils ComStar A/C Zero Leak, Fluorescent Yellow 4 Oz, Permanent "Stop Leak", Non-Polymer Formula for Automotive, Commercial & Residential HVAC, Prevents Clogs, Compatible with All AC Lubricants (90-700)

**Brand:** comstar
**Price:** RM235
**Availability:** ✅ In Stock

## Summary

> ❄️ Seal the deal on leaks before they cool your vibe!

## Quick Answers

- **What is this?** ComStar A/C Zero Leak, Fluorescent Yellow 4 Oz, Permanent "Stop Leak", Non-Polymer Formula for Automotive, Commercial & Residential HVAC, Prevents Clogs, Compatible with All AC Lubricants (90-700) by comstar
- **How much does it cost?** RM235 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.my](https://www.desertcart.com.my/products/28481758-comstar-a-c-zero-leak-fluorescent-yellow-4-oz-permanent)

## Best For

- comstar enthusiasts

## Why This Product

- Trusted comstar brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Powerhouse 🧴:** 4 oz bottle treats up to 12-ton systems—perfect for professionals and DIYers aiming for efficient, reliable cooling.
- • **Instant Leak Sealing 💧:** Permanently seals minor evaporator, condenser, gasket, and seal leaks without downtime.
- • **Eco-Conscious Formula 🌿:** Polymer-free, non-hardening, and environmentally safe—protect your system and the planet.
- • **Maintenance Made Easy 🔧:** Designed for preventive use and safe to leave in operating A/C systems, saving costly repairs and downtime.
- • **Universal Compatibility 🛠️:** Works seamlessly with POE, PAG, and mineral oil-based A/C lubricants across automotive, commercial, and residential systems.

## Overview

ComStar A/C Zero-Leak is a cutting-edge, polymer-free liquid solution engineered to permanently seal minor leaks in automotive, commercial, and residential A/C systems. Its eco-friendly, non-hardening formula ensures no clogging or damage, compatible with all major A/C lubricants. Trusted by professionals and DIY enthusiasts alike, this 4 oz powerhouse treats up to 12-ton systems, delivering instant, lasting leak protection and peace of mind.

## Description

ComStar’s A/C Zero-Leak is specially formulated to stop small leaks in evaporators and condensers as well as around gaskets and seals. Permanent "Stop Leak" for A/C Systems & co-friendly. This environmentally safe product can be used in automotive, commercial, and residential A/C applications. Can be used for preventive maintenance and left in an operating system. Designed not to harm A/C systems, a non-hardening and polymer-freeCompatible with POE-based, PAG-based, and mineral-oil-based mobile AC lubricants A/C Zero-Leak contains no polymer, which means no clogs and no worries! This distinct advantage, unlike competing products, ensures A/C Zero-Leak will not form hard particles when it comes in contact with moisture in a system. Commercial and residential A/C applications, one 4 oz bottle is fit for up to a 12-ton system. A/C Zero-Leak can be left in an operating system. For larger systems over 12 tons use an appropriate ratio of approximately 1 oz per every 6 tons over the original 12 tons. As an alternative way to estimate the dosage necessary, please refer to the product attachments that show dosage by the amount of refrigerant charge that a system holds.

Review: It fixed a leak on my evaporator core where other products failed completely. It saved me a bundle - This product worked for me, it fixed what appeared to be a large leak on the A/C evaporator core on my 2008 Trailblazer. It was my last ditch effort before having to chose between paying over $1,000 in labor + parts, or to spend 2+ days and approx. $300 in parts replacing the evap core myself. No A/C while sitting in traffic at temperatures consistently above 88F year-round (rarely dipping below 70F even during "winter") here in South Florida is not really an option. Like in most vehicles, to replace the evap core on a Trailblazer you have to remove the entire dashboard, center console, steering wheel, radio, sound amplifier, and all sorts of wiring and connectors just to be able to get to and remove the plastic enclosure that houses the evaporator core, definitively not a short weekend project unless you are a professional who does this for a living. Long story short, none of the other highly rated stop-leak products I tried before Comstar A/C Zero Leak worked. I recharged the A/C system three times (4-8Oz or more of the stop-leak product plus pure R134-a refrigerant) each time using a different product and following the manufacturer's directions. I was careful to use only products that claimed not to ruin your compressor, accumulator, orifice tube, or to clog your A/C system, every time, the A/C would go from freezing cold right after recharging it back to blowing hot air within 2-3 days max. This SUV is a retired undercover unit I bought at a Police surplus auction, I'm pretty sure their maintenance crew tried to fix the issue before decommissioning the vehicle, everything else on it works just fine. Two months ago I purchased this product (Comstar A/C Zero Leak, 4 oz.) and an A/C repair kit that includes a vacuum pump, manifold gauges, vacuum pump oil, hoses, and accessories ( https://www.desertcart.com/gp/product/B077PY6NHR/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1 ), I also purchased 4 Oz PAG oil and enough pure R134-a refrigerant to refill the system, all for less than $170. I took the SUV to my mechanic to have the A/C evacuated using the proper equipment ( most A/C shops do this for free around here), then I added a approximately 2 ounces of this product by pouring it directly into the hose connected to the low pressure port before opening any valves, and proceeded to recharge the system with some PAG oil (2 Oz in my case) and the amount of R134-a as specified in the owner's manual. SUCCESS! It's been two months since I did this, and my A/C remains so cold that I rarely have to bring the controls above the minimum fan speed on this sweltering Florida summer. I use a bluetooth OBD II reader with a mobile app to keep an eye on my A/C internal pressure (reported by the high pressure sensor) along with the engine and transmission temperatures, my A/C high pressure hasn't dropped at all during this time. I don't know if this will keep my A/C working months or years, but so far so good.
Review: good part - works good

## Features

- Is a specially developed product for preventing minor leaks in evaporators, condensers, gaskets, and seals
- Environmentally safe & suitable for use in automotive, commercial, and residential A/C applications
- Designed to not harm A/C systems with non-hardening, polymer-free characteristics
- Compatible with POE-based, PAG-based, and mineral-oil-based mobile AC lubricants
- Used for preventive maintenance and left in an operating system

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01C40JEH8 |
| Best Sellers Rank | #234,152 in Automotive ( See Top 100 in Automotive ) #31 in Refrigerants |
| Brand | ComStar |
| Customer Reviews | 4.1 4.1 out of 5 stars (160) |
| Date First Available | February 22, 2016 |
| Global Trade Identification Number | 00024924907009 |
| Item Form | Liquid |
| Item Weight | 4 ounces |
| Item model number | 90-700 |
| Liquid Volume | 4 Fluid Ounces |
| Manufacturer | ComStar International, Inc. |
| Manufacturer Part Number | 90-700 |
| Material | Silicone |
| Model | 90-700 |
| Number of Items | 1 |
| Package Information | plastic container |
| Product Dimensions | 1.68 x 1.68 x 4.68 inches |
| SAE J300 Viscosity Grade | 5W-20 |
| UPC | 024924907009 |
| Unit Count | 4.0 Ounce |

## Product Details

- **Brand:** ComStar
- **Item Weight:** 4 Ounces
- **Liquid Volume:** 4 Fluid Ounces
- **Material:** Silicone
- **Package Information:** plastic container

## Images

![ComStar A/C Zero Leak, Fluorescent Yellow 4 Oz, Permanent "Stop Leak", Non-Polymer Formula for Automotive, Commercial & Residential HVAC, Prevents Clogs, Compatible with All AC Lubricants (90-700) - Image 1](https://m.media-amazon.com/images/I/71fXGI+e6XL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: I have a 4 ton system how many OZ will needed ?**
A: A/C Zero Leak, as well as other types, uses the amount of refrigerant in a system to determine how much stop leak should be used, not by the size (Tons) of a system.  The rule of thumb is 2 to 4 lbs of refrigerant per ton.  Therefore, you need to find out how much refrigerant your system operates on.  The minimum refrigerant in a 4-ton system would be 8 lb and the maximum would be 16 lbs.   A/C Zero Leak dosage is 1 ounce per each lb of refrigerant.

**Q: Is this a 4 oz or 2 oz product? Both figures are listed on the same product page.**
A: My bottles contained 4 oz. Not sure if there is a smaller size available.

**Q: It says compatible with poe systems.  is this compatible with high voltage compressors in hybrids and electric cars?**
A: A/C Zero Leak is compatible with POE oils and A/C systems in hybrids and EVs.

**Q: How bad is too bad of a leak ,for it not to work,mine leaks out in about a day n a half**
A: It will not work on that leak.

## Customer Reviews

### ⭐⭐⭐⭐⭐ It fixed a leak on my evaporator core where other products failed completely. It saved me a bundle
*by A***A on July 23, 2021*

This product worked for me, it fixed what appeared to be a large leak on the A/C evaporator core on my 2008 Trailblazer. It was my last ditch effort before having to chose between paying over $1,000 in labor + parts, or to spend 2+ days and approx. $300 in parts replacing the evap core myself. No A/C while sitting in traffic at temperatures consistently above 88F year-round (rarely dipping below 70F even during "winter") here in South Florida is not really an option. Like in most vehicles, to replace the evap core on a Trailblazer you have to remove the entire dashboard, center console, steering wheel, radio, sound amplifier, and all sorts of wiring and connectors just to be able to get to and remove the plastic enclosure that houses the evaporator core, definitively not a short weekend project unless you are a professional who does this for a living. Long story short, none of the other highly rated stop-leak products I tried before Comstar A/C Zero Leak worked. I recharged the A/C system three times (4-8Oz or more of the stop-leak product plus pure R134-a refrigerant) each time using a different product and following the manufacturer's directions. I was careful to use only products that claimed not to ruin your compressor, accumulator, orifice tube, or to clog your A/C system, every time, the A/C would go from freezing cold right after recharging it back to blowing hot air within 2-3 days max. This SUV is a retired undercover unit I bought at a Police surplus auction, I'm pretty sure their maintenance crew tried to fix the issue before decommissioning the vehicle, everything else on it works just fine. Two months ago I purchased this product (Comstar A/C Zero Leak, 4 oz.) and an A/C repair kit that includes a vacuum pump, manifold gauges, vacuum pump oil, hoses, and accessories ( https://www.amazon.com/gp/product/B077PY6NHR/ref=ppx_yo_dt_b_asin_title_o01_s01?ie=UTF8&psc=1 ), I also purchased 4 Oz PAG oil and enough pure R134-a refrigerant to refill the system, all for less than $170. I took the SUV to my mechanic to have the A/C evacuated using the proper equipment ( most A/C shops do this for free around here), then I added a approximately 2 ounces of this product by pouring it directly into the hose connected to the low pressure port before opening any valves, and proceeded to recharge the system with some PAG oil (2 Oz in my case) and the amount of R134-a as specified in the owner's manual. SUCCESS! It's been two months since I did this, and my A/C remains so cold that I rarely have to bring the controls above the minimum fan speed on this sweltering Florida summer. I use a bluetooth OBD II reader with a mobile app to keep an eye on my A/C internal pressure (reported by the high pressure sensor) along with the engine and transmission temperatures, my A/C high pressure hasn't dropped at all during this time. I don't know if this will keep my A/C working months or years, but so far so good.

### ⭐⭐⭐⭐⭐ good part
*by B***S on August 7, 2025*

works good

### ⭐⭐⭐⭐⭐ It Stopped The Leak
*by M***L on January 30, 2024*

So I am a home mechanic. And that means I save money. When you save money you can afford to spend a little to save a lot and that is what I did. 2009 Toyota Avalon started to leak at 200,000 miles. I would put in a partial can about once every 6 month and then a month and then a week. Each time doing what I did car after car before. Finally I bought a vacuum pump and gauges. I got a deal locally and see even a better deal on Amazon for a combo at about $119.00, get it and be happy. I am not a pro and I do or did not need a mega expensive system. I bought this stop leak and some dye along with a detector light and glasses (glasses useless) turned out after this goo stop stuff those glasses and dye were not needed since there was no leak after. Anyway stick with me here because the following is important. I put the A/C Zero leak into the yellow tube from the gauge manifold. It does not mater from which side just keep both sides up to keep it in and then connect the can and hose back up in a mater that keeps it in the tube. Yes it is messy. What is IMPORTANT is this. "Once the can is opened and freon has gone into your system and enough freon is in to start the A/C pump and another can or partial is put in to get the Gauges at Low side 30PSI and high side at 145PSI or a little less for my car. Keep the car running. Did you catch the last part KEEP THE CAR RUNNING. That pump in your A/C system likely flows very very slow and it has many feet of tubing...what maybe 100 feet when you figure the side to side to side in the evaporator and condenser and then the dryer and the delivery and return tubes. My point is leave it running for an hour or two so the leak stuff can get in the entire system and find the leak. Even if it is cold outside , leave the A/C on with the heat. A/C draws moisture out of your car and the pump can circulate that even when the heat is on. That is how the defrost works you know. DRY AIR blowing heat using the A/C and the heater core at the same time. Anyway. My A/C is ice cold and hanging in there. I expect to put the other half of the A/C Zero-Leak in if needed and will update if I do. I planned to pay $2000 for a new A/C if this did not work because it is cheaper than a new car , also the Avalon is a sweet fast riding car and it is paid for. Good luck for your first try"

## Frequently Bought Together

- ComStar A/C Zero-Leak, Permanent "Stop Leak" for A/C Systems, Seals Leaks Instantly, Non-Hardening, Polymer-Free, Eco-Friendly, Made in USA, 4 Ounces (90-700)
- X AUTOHAUX Oil and Dye Injectors Kit 30ml/1 Oz Hand Push Compressor Manual AC Oil Dye Injector with Quick Coupler 1/4 SAE Connector Car HVAC Compressor Oil Dye Injector Refrigerant Tool

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*Product available on Desertcart Malaysia*
*Store origin: MY*
*Last updated: 2026-02-20*