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💨 Flush like a pro — clean systems, zero downtime!
Mastercool 91049-128-4 is a professional-grade A/C flush solvent designed to thoroughly clean automotive and HVAC/R systems by removing refrigerant oil, debris, and sludge. Its non-flammable, non-corrosive formula evaporates quickly without leaving residue, protecting O-rings and seals while supporting multiple refrigerants. Available in convenient 1-gallon 4-packs, it’s made in the USA by a trusted brand with over 40 years of industry expertise.

| Asin | B015MXFVBC |
| Best Sellers Rank | #29,420 in Automotive (See Top 100 in Automotive) #38 in Air Conditioning Oils |
| Brand Name | Mastercool |
| Customer Reviews | 4.6 4.6 out of 5 stars (181) 4.6 out of 5 stars |
| Global Trade Identification Number | 00700376112177 |
| Included Components | 4 - 1 gal plastic bottles |
| Item Form | Wipe |
| Item Volume | 512 fluid ounces |
| Manufacturer | Mastercool |
| Material Features | Unscented |
| Model Number | 91049-128-4 |
| Number Of Items | 4 |
| Part Number | 91049-128-4 |
| Scent | Unscented |
| Size | 128 Fl Oz (Pack of 4) |
| Special Features | Residue Free |
| Specific Uses For Product | Air Conditioner |
| Surface Recommendation | Metal |
| Unit Count | 512 Fluid Ounces |
| Upc | 700376112177 |
| Warranty Description | 1 year |
User
Made to do the job correctly.
This was a good choice to flush my evaporator coil with the flush kit I bought. Some say it is oily, but after flushing with a third of the bottle each time it came out clear and dried fairly quickly when blowing air through to help dry it out. If yoy are going to flush out lines and condensor you may need to buy the gallon size as you can use alot flush quickly, but, it is cheaper than using the cans if you have or get a flush kit with the canister to spray it through the system.
User
Cleans line set well
Used this on a new install from r22 to r32 and worked great. Left no residue and evaporated completely with vacuum.
User
Excellent fast dry flush!
Great flush! Best wat to buy!
User
But again!!
Works just as advertised
User
Llegó bien
Buen
User
Ac flush
Arrived on time in excellent condition and worked great
User
Great quality
Would recommend
User
Works well but does leave some residue
It works but it does leave some residue. Smell is not strong. Wear gloves as it will turn your skin white. Did a good job of cleaning out the old pag oil. Prefer this to the stuff in the pressurized can because you can run this as used through a couple times to get most oil out then new clean flush through for the final pass which saves flush.
User
Don’t buy
Item came with no product labels. Can’t risk putting this into my ac system. No returns. Do t buy
User
This is a detergent NOT a flush solvent ..!
This is a detergent NOT a flush solventIt kills a two ton ac in less than 10 minutesAnd the item is even NOT RETURNABLE!!angry
User
no de suivis inutile, ne donnes pas d’information de suivis
Un no de suivis qui ne donne rien
Trustpilot
1 week ago
1 month ago