MUZZYS A/C HACK KIT Fits: Ram 2019 2020 2021 2022 1500 2500

The Muzzys A/C Hack Kit bypasses the heater-core blend-door leak, reducing cabin air temperature by about 8°–15° without cutting or replacing the dash.

Many 2019–2022 Ram 1500, 2500 and 3500 trucks suffer from warm air bleeding into the HVAC system because of a factory blend-door/heater-core routing issue. The Muzzys kit provides a reversible heater-supply bypass and inline shutoff valve that redirects heater flow only when needed, letting your air conditioning deliver noticeably cooler air while avoiding costly dash removal or risky warranty repairs.

How does this kit make my truck's A/C colder?

The kit prevents hot coolant from continually passing through the heater core when the A/C is running, so less warm air mixes with the cooled air from the evaporator. By installing the inline shutoff valve and rerouting the heater supply hose, the system minimizes heat transfer into the cabin without altering factory HVAC electronics.

• Installs inline on the heater supply hose to stop continuous coolant flow.
• Redirects the removed hose to a water-pump or turbo-adjacent connection depending on engine.
• Reduces mixed hot air, producing an average 8°–15° drop in vent output.

Where exactly do I install the valve on gas versus diesel models?

Installation points differ by engine: gas V6/V8 Rams use a valve mounted at the front water pump heater-supply hose; diesel models require mounting above the turbo on the heater supply line. The kit includes detailed photos and hoses to make the correct connection without cutting original components.

• Gas trucks: valve installed at the water-pump heater supply, reconnect supplied hose to pump.
• Diesel trucks: valve installed on heater supply line above the turbo, reconnect to black factory tube.
• Top off coolant after installation — expect a small coolant loss during hose removal.

Will this void my warranty or damage the truck?

Designed as a non-destructive, reversible modification, the Muzzys kit installs without permanent changes to the dash or HVAC; it does not trigger engine fault codes. Because it attaches to existing heater hoses with clamps, you can return the truck to stock condition if necessary.

• No dash removal or HVAC replacement required.
• Uses premium components and hose clamps for secure, leak-free connections.
• Reversible installation — removes cleanly if you need to restore factory routing.

How long does installation take and what tools do I need?

Most installations take minutes to an hour depending on accessibility and model; gas trucks are generally quicker than diesel due to routing differences. You’ll need basic hand tools, coolant catch container, and possibly a funnel to top off coolant after reconnecting hoses.

• Typical install time: 15–60 minutes depending on access and experience.
• Tools: pliers, screwdrivers or small socket set, coolant drain pan, funnel.
• Follow included photos for correct hose identification and clamp placement.

Who this is for: The Muzzys A/C Hack Kit is for owners of 2019–2022 Ram 1500, 2500, and 3500 trucks—gas or diesel—who experience weak or warm factory A/C and want a fast, reversible repair that improves vent temperatures without a full HVAC replacement. It suits DIYers and technicians looking for a reliable, non-invasive fix using high-quality parts and clear installation photos.