Autopapyrus · UAZ Patriot (1st generation)
https://autopapyrus.com/guides/uaz/patriot/eliminating-hvac-and-a-c-odor-replacing-the-cabin-air-filter/
https://autopapyrus.com/guides/uaz/patriot/eliminating-hvac-and-a-c-odor-replacing-the-cabin-air-filter/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.
UAZ Patriot (1st generation): Eliminating HVAC and A/C Odor, Replacing the Cabin Air Filter
Odor in the cabin is usually caused by a dirty cabin air filter and bacterial buildup on the evaporator, where condensation collects. The procedure is: replace the filter, treat the evaporator and air ducts, check the condensate drain, and dry the system. The exact panel removal sequence depends on the interior trim level, so follow the actual location of the fasteners on your vehicle.
Parts
3| № | Part | Alternatives |
|---|---|---|
| 01 | Cabin air filter for UAZ Patriot | Big Filter, Filtron, Mann |
| 02 | A/C evaporator cleaner spray with long application tube | |
| 03 | Antibacterial disinfectant spray for ventilation system |
Tools
5- screwdriver set (Phillips, flat)
- 8-10 mm sockets
- vacuum cleaner
- flashlight
- plastic trim removal tool
Step by step
11 steps- Shut off the engine and park the vehicle on level ground. It is best to keep the ignition off while working inside the cabin.
- Locate the cabin air filter housing. It sits in the heater/HVAC unit under the dashboard on the passenger side, behind the glove box or the lower side trim panel. Empty the glove box, then remove it or the lower trim panel: remove the screws and carefully pry off the plastic clips with the trim tool.
- Remove the filter housing cover. It is held by latches or small screws. Note the position of the old filter and the direction of the airflow arrow on it.
- Pull out the old filter. It will be dirty and may be damp or moldy. Vacuum leaves and dust out of the housing. Wipe the seat with a damp cloth or wipe, then let it dry.
- Treat the housing and the inlet air duct with the antibacterial product. Do not install the new filter yet.
- Evaporator treatment. Option A: if you have access, insert the aerosol tube through the filter opening or the drain opening and spray the product as directed on the can. Option B: start the engine, set the fan to maximum, set the mode to fresh air intake, turn the A/C off, and spray the disinfectant into the air intake at the base of the windshield (the grille under the hood). Do not spray liquid onto electronic modules or connectors.
- Let the product work for the time stated on the can (usually 5-15 minutes). Dirty liquid should drain out through the drain under the vehicle. Check that the condensate drain tube on the firewall is not clogged or pinched. If the drain is clogged, push soft wire through it or blow it out with compressed air, otherwise the odor will return.
- Dry the system: run the fan at maximum with heated air (heater on) for 10-15 minutes with the windows open. Do not turn on the A/C at this stage.
- Install the new cabin air filter with the airflow arrow oriented the same way as on the old one, seating the edges snugly without twisting or gaps. Install the housing cover, the trim panel and the glove box. If the fasteners are plastic, tighten the screws without excessive force.
- Clean the cabin: vacuum the floor mats and the air intake grille under the hood, and treat the upholstery for odor if needed. Make sure there are no leaves or debris in the air intake area under the hood.
- Check the result: turn on the A/C, recirculation and the defrost/vent settings in different modes. The odor should be gone. If cooling is weak, take the vehicle to a repair shop to have the refrigerant pressure checked.
Common mistakes and warnings
- Replace the cabin air filter on the Patriot about every 30,000 km or 2 years, and more often if you drive on unpaved roads
- To keep the odor from coming back, turn the A/C off 3-5 minutes before you stop and leave the fan running so the evaporator dries out
- If the smell is sweetish and the windows fog up, the heater core may be leaking
- If the odor persists after cleaning, or there are traces of oil in the A/C system, take the vehicle to a repair shop: working with refrigerant requires special equipment