Maya Ellison
Plastic heater core lines are notorious for becoming brittle and cracking or breaking due to heat cycles. This is a common issue, and there are a few ways to reinforce or replace these lines. One method is to cut the line and splice it with a heater hose, while another involves using a metal disconnect tool to remove the old plastic connector and replace it with a new one. Additionally, some people choose to use stainless steel braided hoses or regular heater hoses to replace the plastic lines, which can be more durable and long-lasting. Reinforcing plastic heater core lines can be a complex task, and it is important to carefully follow instructions to avoid causing further damage or creating leaks in the system.
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What You'll Learn
Cutting and splicing with a heater hose
To reinforce plastic heater core lines, you can cut and splice with a heater hose. This process involves removing the damaged section of the hose and replacing it with a new piece. Here's a step-by-step guide:
Step 1: Gather the Necessary Tools and Materials
You will need a sharp utility knife or hose cutter, hose clamps or couplings, and a screwdriver or wrench. You may also want to wear protective gloves and eyewear to avoid any accidents when working with sharp tools.
Step 2: Cut the Hose
Use the utility knife or hose cutter to make a clean and straight cut through the hose. Remove the damaged section of the hose, ensuring that the cuts are perpendicular to the fibers and free from any jagged edges.
Step 3: Insert the Coupling or Hose Mender
Take the coupling or hose mender and insert it into both ends of the cut hose. Ensure that the coupling is compatible with the size of your hose for a secure connection. Push the hose all the way onto the coupling to ensure a tight fit.
Step 4: Secure with Hose Clamps
Slide a hose clamp onto each cut end of the hose, over the coupling. Tighten the hose clamps securely using a screwdriver or wrench. This will help to create a strong and reliable connection.
Step 5: Test the Connection
Once the hose clamps are tightened, test the splice by turning on the water and checking for any leaks. If you notice any leaks, simply tighten the hose clamps further until the leak is stopped.
Additionally, there are some alternative methods to reinforce plastic heater core lines. One option is to use glue or cement, such as PVC pipe glue, tire patch glue, or Gorilla Glue. However, it is important to note that glue may not work well with the rubber material of the hose and could potentially cause leaks. Another option is to use clamps, such as small CV joint boot clamps or crimp clamps, without gluing.
Furthermore, when dealing with plastic fittings in heater hoses, it may be necessary to drain the cooling system and remove the plastic piece before attaching the heater hose directly to the heater core. This can be done using a quick disconnect removal tool or by making your own tool with a cheap plastic 3/4" quick disconnect tool from an auto parts store.
By following these steps and considering the alternative methods, you can effectively reinforce plastic heater core lines by cutting and splicing with a heater hose.
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Using a disconnect tool
Plastic heater hose connectors are used in many vehicles, including GM trucks, vans, and SUVs. While these connectors are great on the General Motors assembly line, they tend to become brittle and break off over time. When this happens, you will need to use a disconnect tool to remove the broken connector and replace it with a new one.
A special heater hose disconnect tool can be used to remove the plastic heater hose connectors. This tool works by releasing the spring fingers on the inside of the connector. The small plastic tool folds around the backside of the tube and is slid into the connector until the fingers are released. Then, the connector can simply be slid off the pipe.
Another option is to use a set of Lisle AC disconnect tools, which are available at most parts stores for less than $10. These tools can hold the catch open while you pull the connector off the pipe or vice versa, depending on which end of the hose you are working on. However, in some cases, the tool may not be able to release the fitting, and you may need to cut off the connector.
If you need to cut off the connector, it is important to use the right tools and techniques. You can use a hand saw with a hacksaw blade or a small air-powered or electric reciprocating saw. Make one straight cut across the top and another slice across the bottom, splitting the connector in half. Do not cut the pipe itself. You can also try to split the connector with a flat blade screwdriver if it doesn't come apart easily.
In some cases, you may need to remove the plastic fitting that sits in front of the firewall that the heater core coolant hose goes into. This can be done using a quick disconnect removal tool, which can be purchased or made from a cheap plastic 3/4" quick disconnect tool found at most auto parts stores. File the tool down until it fits into the back of the fitting, and then disconnect it from the heater core pipes.
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Replacing plastic with metal parts
Plastic parts in a heater core line can be reinforced by replacing them with metal parts. This can be done by purchasing a few extra pieces, such as a PEX 1" x 3/4" x 1" tee and a Dayco 80416 premolded 90-degree 3/4" hose. The first step is to drain the cooling system, which can be done by removing any skids or fairings and using a large Phillips-head screwdriver to remove the drain on the bottom of the passenger side of the radiator.
Next, the plastic tee can be removed and replaced with a metal alternative, such as the metal Dorman part (626-589). The hose can then be attached directly to the heater core. It is important to note that the pipe will be loose, so it is recommended to split the hose going into the heater core tube to make it easier to remove. A light twist with a pair of channel locks can help to free it up after removing the clamps.
When replacing plastic with metal parts, it is important to consider the advantages and disadvantages of each material. Plastic parts can offer cost savings, improved design flexibility, weight reduction, corrosion resistance, reduced assembly, and enhanced safety. On the other hand, metal parts may have better structural integrity and higher melt points. Additionally, the ability to replace multiple metal parts with a single plastic part can simplify the assembly process and reduce costs.
In terms of specific metal parts that can be replaced with plastic, aluminum, stainless steel, and brass are commonly substituted with polymers. For example, Carbon PA, a nylon-based filament, can replace aluminum jigs and fixtures due to its high tensile strength. PEEK and Carbon PEEK can replace stainless steel in applications requiring chemical resistance and weight reduction. In the marine industry, brass can be replaced with plastic alternatives that offer similar seawater resistance and antibacterial properties.
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Using a hose coupler
If you are repairing a plastic heater core line, you may need to replace the hose coupler. This is because the plastic can become brittle and crack over time, causing leaks.
To reinforce plastic heater core lines using a hose coupler, you will need to first cut the hoses close to the bottom, leaving enough length for the heater hose to slide over. You will need around 2cm of length. An angle cutter can be used for this step. Once cut, remove the two torx screws holding the coupler in place on the engine side. With the screws removed, use a flathead screwdriver to wiggle the metal plate off. You can then remove the coupler from the cabin side, along with any pieces of metal hose that are still attached.
The next step is to gut the coupler so that the new hose can pass through. Unclip the metal hoses and remove them, then pull the plastic connectors straight out, twisting and turning as you do so. Now, you can insert the new hose. It may be helpful to cut the coupler's ends off for extra clearance later on. You do not need any plastic sticking out past the metal cover plate on the engine side. The hose may not seal perfectly inside the coupler, so you may want to use a piece of silicone vacuum hose, cut to the right length, and wrap it around the hose. Twist the hose through the coupler while applying pressure to the seal.
Finally, wiggle the coupler with the hoses attached back into its original hole. You may need to bend the plastic to get it to snap back into place. Then, slide the heater hose over the metal hoses.
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Removing the intake manifold
To reinforce plastic heater core lines, you may need to remove the intake manifold first. This process can be complex and vary depending on your vehicle's specific make and model. Here is a step-by-step guide on removing the intake manifold, which should be done only after discharging the refrigerant from the A/C system and draining the engine cooling system:
Begin by disconnecting the instrument panel wire harness and the fuse block electrical connectors. Carefully detach the steering member from each side of the vehicle body. Remove the front heater and cooling unit assembly, being cautious not to damage the seats and interior trim panels. Take out the blower motor side cover, followed by the front blower motor itself. Remove the heater core and evaporator case bottom cover, and then the blower motor case. Now, you can proceed to remove the front heater core.
In some cases, you may need to remove additional components for better access. These can include the wiper arms, cowl top cover, cowl top seal, windshield washer nozzles, and hoses from the cowl top cover. Ensure you have the necessary tools and refer to vehicle-specific repair manuals or seek guidance from experienced mechanics for a more detailed understanding of the process.
Once the intake manifold is removed, you can access the heater hose and its connections. Inspect the hose for any signs of damage, leaks, or deterioration. Depending on the condition of the hose and your vehicle's requirements, you may need to replace or reinforce the plastic heater core lines. It is crucial to follow manufacturer recommendations or seek professional assistance if you are unsure about the procedure.
During the reassembly process, ensure that all components are securely connected and fastened. Refer to the vehicle's repair manual for torque specifications and specific instructions related to your particular model. Remember to always exercise caution and follow safety protocols when working on your vehicle.
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Frequently asked questions
Reinforcing plastic heater core lines may involve replacing plastic parts with metal alternatives, such as stainless steel braided hoses, or using a metal disconnect tool.
You can use a disconnect tool to remove plastic fittings. You can also make your own tool by taking a cheap plastic 3/4" quick disconnect tool and filing it down so that it fits into the back of the fitting.
To remove plastic tees, simply cut the tee off the pipe just past the first bend. You can then use a flaring tool to put a little bubble at the end of the tube to help retain the hose under pressure.
It is recommended to drain the cooling system before replacing a plastic tee. However, some people have chosen to forgo this step and only lost a couple of cups of antifreeze in the process.
You will need to purchase a PEX 1" x 3/4" x 1" tee and a 90-degree hose. The hose should be 3/4" and you will have some spare length for your toolbox.
