{"id":1108791,"date":"2026-03-04T14:37:22","date_gmt":"2026-03-04T14:37:22","guid":{"rendered":"https:\/\/sercalia.com\/?p=1108791"},"modified":"2026-08-25T18:36:03","modified_gmt":"2026-08-25T18:36:03","slug":"humidity-in-the-car-and-air-conditioning-desiccants","status":"publish","type":"post","link":"https:\/\/sercalia.com\/en\/humidity-in-the-car-and-air-conditioning-desiccants\/","title":{"rendered":"Moisture in the car and air conditioning desiccants"},"content":{"rendered":"\n<div class=\"et_pb_section_0 et_pb_section et_section_regular et_block_section\"><div class=\"et_pb_row_0 et_pb_row et_block_row\"><div class=\"et_pb_column_0 et_pb_column et_pb_column_4_4 et-last-child et_block_column et_pb_css_mix_blend_mode_passthrough\"><div class=\"et_pb_text_0 et_pb_text et_pb_bg_layout_light et_pb_module et_block_module et_pb_text_align_center\"><div class=\"et_pb_text_inner\"><h1>Moisture in the car: how desiccants influence air conditioning and vehicle protection<\/h1>\n<\/div><\/div><\/div><\/div><\/div><div class=\"et_pb_section_1 et_pb_section et_section_regular et_block_section\"><div class=\"et_pb_row_1 et_pb_row et_block_row\"><div class=\"et_pb_column_1 et_pb_column et_pb_column_3_5 et_block_column et_pb_css_mix_blend_mode_passthrough\"><div class=\"et_pb_image_0 et_pb_image et_pb_module et_block_module\"><a href=\"https:\/\/sercalia.com\/en\/automotive-desiccant-bags\/\"><span class=\"et_pb_image_wrap\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/sercalia.com\/wp-content\/uploads\/2026\/03\/humedad-en-el-coche.jpg\" width=\"400\" height=\"265\" srcset=\"https:\/\/sercalia.com\/wp-content\/uploads\/2026\/03\/humedad-en-el-coche.jpg 400w, https:\/\/sercalia.com\/wp-content\/uploads\/2026\/03\/humedad-en-el-coche-300x199.jpg 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" class=\"wp-image-1108824\" alt=\"Car mositure absorber bags | Moisture in the car - Sercalia\" title=\"Car mositure absorber bags\" \/><\/span><\/a><\/div><div class=\"et_pb_text_1 et_pb_text et_pb_bg_layout_light et_pb_module et_block_module\"><div class=\"et_pb_text_inner\"><p><b>Moisture in the car<\/b><span style=\"font-weight: 400;\"> may seem like a minor issue when it only appears as fogged windows or unpleasant odours. From a technical standpoint, however, its presence directly affects the <\/span><b>air conditioning system<\/b><span style=\"font-weight: 400;\">, metallic components and interior materials of the vehicle.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Controlling moisture not only improves comfort, but also protects the reliability and service life of the car.<\/p>\n<p><\/span><\/p>\n<h2>Why can moisture in the car cause damage?<\/h2>\n<p><span style=\"font-weight: 400;\">Moisture can enter the vehicle through temperature changes, leaks, frequent use of the climate control system or prolonged storage.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">When it accumulates, it may lead to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Corrosion of metal components,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Degradation of plastics and seals,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Persistent odours inside the cabin,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An increased risk of air conditioning system failures.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">For this reason, the automotive industry integrates <\/span><a href=\"https:\/\/sercalia.com\/en\/moisture-absorbents\/\"><b>moisture protection systems <\/b><\/a><span style=\"font-weight: 400;\">at both technical and preventive levels.<\/p>\n<p><\/span><\/p>\n<h2>The key role of desiccants in air conditioning<\/h2>\n<p><span style=\"font-weight: 400;\">Within the air conditioning system, moisture is particularly critical. If not properly controlled, it can react with the refrigerant or lubricant, affecting the performance of the compressor and other components.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">To prevent this, manufacturers use <\/span><a href=\"https:\/\/sercalia.com\/en\/automotive-desiccant-bags\/\"><b>automotive desiccant bags<\/b><\/a><span style=\"font-weight: 400;\"> specifically designed for refrigeration systems.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These bags:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contain <\/span><b>high-capacity molecular sieves<\/b><span style=\"font-weight: 400;\">,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Are manufactured from durable materials compatible with modern refrigerants,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Are integrated into the system\u2019s receiver-drier,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Comply with the stringent quality standards of the automotive industry.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Their primary function is to absorb moisture from the refrigerant and lubricant, maintaining safe levels within the closed circuit.<\/p>\n<p><\/span><\/p>\n<h2>What types of desiccants are used?<\/h2>\n<h3>Molecular sieve<b><br \/><\/b><\/h3>\n<p><span style=\"font-weight: 400;\">This is the most widely used desiccant in internal air conditioning systems.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High selectivity for water molecules,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High adsorption capacity,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compatibility with refrigerants such as R-134a,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Long-term stability.<\/span><\/li>\n<\/ul>\n<p>It is essential for maintaining system stability and preventing internal corrosion<\/p>\n<h3>Silica gel<b><br \/><\/b><\/h3>\n<p><span style=\"font-weight: 400;\">More commonly used for storage or environmental protection.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Good absorption capacity,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cost-effective,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Safe.<\/span><\/li>\n<\/ul>\n<p>It is not usually employed directly within the pressurised circuit, but may form part of auxiliary solutions.<\/p>\n<h3>Activated clay (bentonite)<b><br \/><\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Found in simpler solutions, such as some <\/span><b>anti-moisture bags<\/b><span style=\"font-weight: 400;\"> for the vehicle interior.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Moderate capacity,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Low cost,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use focused more on the cabin than on the technical circuit.\n<p><\/span><\/li>\n<\/ul>\n<h2>What do studies indicate about moisture and stability?<\/h2>\n<p><span style=\"font-weight: 400;\">Laboratory tests and vehicle fleet trials have shown that:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The amount of desiccant directly influences moisture levels,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Less desiccant results in higher moisture content,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">However, moderately higher levels do not always cause immediate degradation of the refrigerant or lubricant.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This means that modern systems tolerate small variations more effectively, but the desiccant remains a key component for long-term stability.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">The current trend is not to eliminate moisture entirely, but to keep it within safe limits.<\/p>\n<p><\/span><\/p>\n<h2>Visible moisture in the car: the issue perceived by the driver<\/h2>\n<p><span style=\"font-weight: 400;\">For drivers, <\/span><b>moisture in the car<\/b><span style=\"font-weight: 400;\"> is typically detected through:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unpleasant smells,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Fogged windows,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A sensation of stale air.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In these situations, the following are commonly used:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\">Products to remove damp odours from the car<span style=\"font-weight: 400;\">,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Car moisture absorbers,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Small reusable anti-moisture bags,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Containers with absorbent salts.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">While <\/span><b>these moisture absorbers <\/b><span style=\"font-weight: 400;\">help improve the interior environment, they do not replace the technical function of the desiccant within the air conditioning system.<\/span><\/p>\n<h4>In CKD manufacturing and assembly<\/h4>\n<p><span style=\"font-weight: 400;\">In CKD (Completely Knocked Down) assembly processes, moisture control is also relevant during the transport and storage of components.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">In such cases, the following are used:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Industrial desiccant bags,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Moisture protection systems during logistics,<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Absorbent materials in technical packaging.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">As a result, the risk of corrosion prior to final vehicle assembly is reduced.<\/span><\/p>\n<p><b>Moisture in the car<\/b><span style=\"font-weight: 400;\"> affects both comfort and the technical durability of the vehicle.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Inside the air conditioning system, molecular sieve desiccant bags play an essential role in maintaining stability and preventing damage, while in the cabin, solutions such as anti-moisture bags complement protection.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The balance between internal technology and preventive maintenance is the most effective strategy for long-lasting moisture protection.<\/span><\/p>\n<p>&nbsp;<\/p>\n<\/div><\/div><\/div><div class=\"et_pb_column_2 et_pb_column et_pb_column_2_5 et-last-child et_block_column et_pb_css_mix_blend_mode_passthrough\"><div 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