Every driver at least once faced with a situation when during a downpour had to lower the window to wipe the foggy glass or just take a breath of fresh air, but instead in the cabin immediately flew streams of water. The solution to this problem is becoming window-deflectorsThese are often called raincoats. These simple devices allow you to open the glass a few centimeters even in a heavy rain, keeping the microclimate in the cabin dry and comfortable.
In addition to protecting against moisture, these accessories serve as wind protection, reducing noise when driving at high speeds and preventing dust and small insects from entering the car. However, the market is full of offers, and choosing a really high-quality model that will not fall off in a week and will not whistle on the track, it can be difficult. In this article, we will analyze all the nuances of the choice, compare the methods of attachment and give instructions for the correct installation.
It is important to understand that deflector - it is not just a piece of plastic, but an aerodynamic element that affects the streamlined body. Incorrectly selected or installed part can become a source of irritating whistles or even damage the paintwork. Therefore, before buying, you need to study the design features of various models and decide on the type of mounting that is suitable for your car.
The main functions and advantages of installing deflectors
The main task that the raincoat solves is the organization of proper air exchange without direct precipitation into the cabin. The design of the product is designed to redirect the air flow over the open window opening. This allows you to ventilate the cabin, expel tobacco smoke or food odors, without opening the window completely. In rainy weather, this is the only way to let in fresh air without wetting the upholstery of the seats and mats.
Another important aspect is protection from dirt. On a wet road in the warmer season, other cars raise fountains of dirty water. If the window is closed completely, it is not scary, but it is worth opening it a little as the spray will be inside. Deflector Takes the blow on itself, leaving the glass and interior of the door clean. This is especially true for rear passengers, who often cannot calculate the distance to the jet as accurately as the driver.
⚠️ Caution: Cheap models made of soft plastic can deform over time under the influence of ultraviolet light and temperature changes, which will lead to the appearance of gaps and a decrease in the effectiveness of protection.
Do not forget about the aesthetic component. Chrome edging or tinted inserts can significantly change the appearance of the car, making it more modern and sporty. Many car owners say that after installing high-quality cars denifier The car looks more “assembled.” In addition, when smoking in the cabin (if allowed and safe), the smoke is drawn out much more effectively, without being pulled back through the rear windows.
- 🌧️ Protect the cabin from rain and snow with windows ajar.
- 💨 Reduced noise and wind vortices at speed.
- 🛡️ Preventing road dirt and small stones.
- 🌬️ Improved ventilation and quick removal of odors from the cabin.
Types of Automotive Deflectors
The range of models available on the market is huge, and they are all divided into several main categories depending on the material of manufacture and installation method. Understanding these differences will help you avoid buying a low-quality item that you’ll have to throw away in a month. The main materials are acrylic, polycarbonate and plastic, each of which has its pros and cons.
By the method of fastening, deflectors are divided into insert and adhesive. Fold-in models mounted directly in the upper part of the window opening, going in the edge under the sealing rubber of the door. They are considered more reliable in terms of fixation, but require accuracy during installation so as not to damage the seal. Adhesive options are fixed on bilateral tape on the outside of the door, which is easier to install, but depends on the quality of adhesion.
It is also worth paying attention to the presence of chrome edging. Chromium gives the product its shine and durability, but over time it can begin to climb, especially if cheap paint or spraying was used. Toned deflectors without chromium look more strict and sporty, better hide small scratches. When choosing a model, it is important to consider not only the appearance, but also the geometry of your car, since there are almost no universal solutions.
Manufacturing materials: acrylic, polycarbonate or plastic
Material selection is a matter of balance between cost, durability and appearance. The most budget option is ordinary plastic. It is often matte, easily scratched by sinks and under the influence of the sun can lose shape or color. These products are short-lived and usually require replacement after a year or two. If you plan to drive a car for a long time, it is better to consider more expensive analogues.
Acrylic deflectors They are more expensive, but they have excellent transparency and resistance to ultraviolet light. They do not turn yellow over time and retain elasticity even in severe frosts. However, acrylic is afraid of aggressive chemistry, so you need to be careful when washing the engine or using strong solvents. Polycarbonate is the “middle ground”: it is stronger than acrylic, cheaper, but can be slightly less transparent.
The Myth of Bulletproof Polycarbonate
It is believed that polycarbonate deflectors do not break down at all. It's not. With a strong hail or branch impact, they can crack, although they withstand the load better than acrylic. The main advantage of polycarbonate is high heat resistance, which allows you to wash the car on high pressure washers without the risk of deformation.
When buying, pay attention to the smell of the product. The high-quality material should not exude a sharp chemical aroma, which can persist in the cabin for weeks. Also check for flexibility: a good deflector should spring slightly rather than break down with a slight bending. Wall thickness also matters – too thin products will vibrate at speed.
Fixing methods: insertion or scotch
The choice of the method of fastening often arises before car owners. Fold deflectors In-channels are considered more aesthetic because they do not stand outside the contour of the door. They are inserted into the groove between the glass and the door frame. Their installation often requires a little bend the top seal, which can be difficult on new cars with tight rubber bands. The main advantage is the lack of adhesive base that can fall off.
Tape-on models are fixed on the outside of the door using a special double-sided tape, usually 3M. This method is easier to implement, but requires a perfectly clean and fat-free surface. If the tape is poor quality or the surface is poorly prepared, the deflector can fly off at high speed. However, modern adhesive models often have additional fixers or a wider contact area.
| Characteristics | In-channel (In-channel) | Plug-on (Tape-on) |
|---|---|---|
| Complexity of installation | Medium/High | Low. |
| Risk of damage | Possible seal damage | The risk of glue detachment |
| Aerodynamics | Best (not performing) | Worse (outside the contour) |
| Compatibility | It requires accurate selection. | More universal. |
There are also combined models that have both a landing groove for insertion, and adhesive base for reliability. This is the best option for those who want to get the maximum confidence in fixation. When choosing, take into account the climatic conditions of your region: in severe frosts, glue can lose its properties, and hard plastic becomes brittle.
☑️ Preparation for deflector installation
Step-by-step instructions for installing deflectors
The installation process requires accuracy and compliance with the temperature regime. It is best to work in the garage at a temperature not lower than +15 ° C, since in the cold the adhesive layer is not activated properly, and the plastic becomes brittle. For insert models, a technical hair dryer may be required to warm up the sealing rubber bands and make them softer.
If you install the adhesive option, the first thing you need to carefully degrease the surface of the door at the point of contact with the tape. Use alcohol or a special degreaser, but not gasoline or acetone, which can damage the paint. After degreasing, do not touch the surface with your hands. Remove the protective film from the tape immediately before gluing, in stages, pressing the deflector with force.
⚠️ Warning: Do not wash your car or drive to the highway for at least 24-48 hours after installing adhesive deflectors. The glue takes time to fully polymerize and gain maximum strength.
For insert models, the algorithm is as follows: try on the deflector without removing protection to understand how it lands. Then carefully insert the front part into the groove between the glass and the frame. Act gradually, moving to the back. If the deflector is tight, you can slightly warm up the edge with a hairdryer. The main thing is not to overdo it and not to tear the sealing rubber from the door.
Care, maintenance and typical problems
After installation, deflectors require minimal but regular maintenance. When automatic washing high pressure try not to direct the jet of water at an acute angle directly under the edge of the deflector, especially if it is on tape. This can lead to gradual detachment. Periodically check the condition of the adhesive layer: if you notice the beginning of the retreat, it is better to immediately reglue the part using a new 3M tape.
One of the common problems is the appearance of a whistle or hum at high speeds. This indicates a violation of aerodynamics or the presence of a gap between the deflector and the body. In some cases, additional fixation of the edge with a small amount of sealant or replacement of the sealant helps. Also, a whistle can occur if the deflector is installed with a skew.
Scratches on the surface can be polished with special polyres for plastic, but if the damage is deep, it is easier to replace the element. Remember that surface defect Not only do they spoil the view, but they can also gleam in the sun, distracting the driver. Regular washing with the use of wax will help to maintain the transparency and smoothness of the material.
Timely check of fastening and neat washing will extend the service life of deflectors 2-3 times, preserving their appearance and functionality.
How to choose a high-quality model and not overpay
When choosing raincoats for the car on the windows, you should not chase the lowest price. Cheap "universal" kits that are sold in markets often require trimming and fitting, which does not guarantee tightness. It is better to buy a specialized model designed specifically for your make and model of car, taking into account the year of release, as the geometry of the doors can change even within one generation.
Pay attention to the packaging and equipment. Quality brands (e.g., Heko, Cobra, Sim) always provide the products with instructions, additional tape and sometimes even alcohol wipes for degreasing. Having a quality certificate and a manufacturer’s guarantee is also a good sign. Avoid products with a pungent smell and a cloudy, heterogeneous structure of plastic.
- ✅ Choose models that are sharpened under a specific brand of car.
- ✅ Give preference to well-known brands with a guarantee.
- ✅ Check the elasticity of the material before buying.
- ✅ Make sure you have a good quality adhesive layer (if applicable).
The final choice should be based on your priorities: if maximum reliability is important and you are ready to spend time on installation, take insert models from top manufacturers. If you need a quick result and you are ready to update Scotch every couple of years, high-quality adhesive options will be suitable. In any case, the presence of deflectors will significantly increase the comfort of operating the car in any weather.
Can I wash my car with automatic deflectors?
Yes, you can, but with caution. Avoid direct hitting of a powerful jet of water under the edge of the deflector, especially if it is glue-based. Wash brushes can also hook protruding parts, so it is better to choose washers with soft brushes or contactless options.
Why did the deflector start to whistle at speed?
The whistle occurs due to a violation of aerodynamics. Possible reasons: the deflector is set curved, the adhesive layer has moved away and a gap has formed, or the model itself does not fit in geometry to your car. Sometimes it helps to glue the joint with a transparent sealant.
How to remove the deflector without damaging the paint?
It is necessary to warm the adhesive layer with a building hair dryer (carefully so as not to overheat the varnish). Then use a fishing line or a special thread to "re-saw" the layer of glue. The residues of the glue are removed with a special solvent for bitumen stains or alcohol.
Do deflectors affect fuel consumption?
Theoretically, any protruding elements worsen aerodynamics, but in the case of modern deflectors, which have a streamlined shape, the effect on fuel consumption is so minimal that it cannot be seen in real operating conditions.