Start with the records. Repair orders, warranty documents, mileage, and days out of service are more useful than general assumptions about whether a vehicle qualifies.
If your car’s radiator fan runs constantly—even after the engine is off—you’re not imagining things. This can drain the battery, mask deeper cooling-system faults, and turn a new-car experience into a stressful routine of service visits. This article explains how California’s lemon law may relate to a constantly running radiator fan and offers practical steps to document repairs. It is for general information only and is not legal advice; a consultation with an attorney is necessary to get guidance on your specific situation.
Radiator Fan Won’t Stop? CA Lemon Law Firm Insights
A radiator fan that won’t shut off can stem from issues like a faulty coolant temperature sensor, a stuck relay, a failed fan control module, wiring faults, or software problems in the powertrain control module. Drivers often notice the fan roaring at high speed even on cool days, the fan continuing after the ignition is turned off, or repeated battery drain overnight. You may also see warning lights or codes related to the cooling fan circuit and AC system.
Under California’s Song-Beverly Consumer Warranty Act (the California Lemon Law), a vehicle with a defect covered by the manufacturer’s warranty that substantially impairs use, value, or safety—and persists after a reasonable number of repair attempts—may qualify for remedies such as repurchase or replacement. California law includes a “presumption” period during the first 18 months or 18,000 miles: for example, if the vehicle is out of service for a total of 30 or more days, or if the same issue is unsuccessfully repaired multiple times. Even if you’re outside those early benchmarks, the law may still apply, and used or certified pre-owned vehicles can qualify if the manufacturer’s warranty still covers the defect.
In real life, constant fan cases often involve a dealership replacing the fan assembly, then the relay, then the temperature sensor, and later performing a software reflash—yet the fan behavior returns. You might experience secondary symptoms like intermittent overheating warnings, poor AC performance, or recurring check-engine codes tied to the fan circuit. If repeated trips to an authorized dealer haven’t resolved the problem, documenting those attempts and understanding your rights is critical before you discuss any buyback or “cash-and-keep” offer with the manufacturer.
Steps to Document Constant Fan Repairs in California
Start by organizing repair orders from every visit. Each service document should show the date, mileage, your exact complaint (“radiator fan runs at full speed after shutdown”), technician findings, diagnostic codes, and parts or software updates performed. Track days out of service, any tow charges, and whether you were provided a loaner or rental. If the shop lists “no problem found,” ask them to record the conditions you reported, especially if the fan behavior is intermittent; photos or short videos capturing the fan noise after key-off can help.
Review your warranty booklet to confirm coverage for cooling system and electrical components, and present the vehicle to an authorized dealership to preserve warranty rights. Use consistent language when describing the problem each visit, and request a case number from the manufacturer’s customer care line after repeat failures. Keep a simple timeline: dates, mileage, symptom description, repair actions, and results. Check for technical service bulletins (TSBs) or recalls related to fan modules or PCM updates, and avoid aftermarket modifications that could give the manufacturer a reason to blame the issue on non-factory parts.
If the problem persists after multiple repair attempts or your car has been out of service a significant number of days, consult a California lemon law firm like ZapLemon. In a consultation, bring your timeline, repair orders, photos or videos, and any communications with the dealership or manufacturer. Don’t sign a release, accept a quick settlement, or stop seeking repairs without understanding your options; potential outcomes can include repurchase, replacement, or a negotiated cash settlement, but results vary and depend on the facts, warranty status, and repair history.
Need a case-specific review?
Use the case-review form to share the warranty, repair orders, dates, mileage, and supporting facts an attorney would need to evaluate, or call (844) 927-5366.
Attorney advertising. General information is not legal advice and does not create an attorney-client relationship. No result is promised or guaranteed.