Cold Weather, Warm Shop: How to Prep Your Equipment for Winter Before It Costs You

Texas shops don't winterize the way Minnesota shops do — but they still see 25°F mornings in December and January, and equipment that runs fine in July can behave very differently in cold ambient temperatures. The shops that handle winter cleanly are the ones who did one hour of preparation in October. The ones who don't spend January troubleshooting compressors, sluggish lifts, and DEF handling problems they didn't see coming.

Air Compressors

Cold weather is hard on compressors for one primary reason: moisture. Warm air holds more water vapor than cold air, and as temperature drops, that moisture condenses inside the tank and lines. In summer, you might drain your tank once a week and see minimal water. In winter, especially during temperature swings, moisture buildup accelerates.

Before cold weather sets in, do the following:

• Drain the tank completely: Open the drain valve at the bottom of the tank and let it empty fully. Do this after a run so the pressure pushes all moisture out.
• Check and test the auto-drain valve: If your compressor has an automatic drain timer, verify it's functioning and set to drain frequently enough for winter conditions. A failed auto-drain is one of the leading causes of tank corrosion.
• Inspect the intake filter: Cold-morning starts are already hard on a compressor, with thick oil and a cold pump. A clogged intake filter that was barely noticeable in summer adds strain right when the machine can least afford it. Replace if there's any doubt. (We stock air treatment maintenance kits and filters.)
• Check oil viscosity: Oil-lubricated compressors require oil that flows at low temperatures. If your current oil has a high pour point, it may not lubricate adequately during cold morning startups. Check manufacturer specs and swap if needed.

One more thing: if your compressor is in an unheated bay or storage area, verify that its minimum operating temperature is rated for the coldest conditions you expect. Running a compressor below its rated minimum can cause startup failure and accelerated wear.

Vehicle Lifts

Hydraulic lifts slow down in cold weather — that's normal. But a lift that cycles noticeably slower in January than it did in June may have hydraulic fluid that's past its service interval or not rated for the temperature range you're in.

• Check hydraulic fluid level and condition: Low fluid makes cold-weather sluggishness worse. Contaminated fluid — milky or dark — should be flushed and replaced before winter. A full flush in October is cheaper than a hydraulic failure in December.
• Verify fluid viscosity rating: Most lift manufacturers specify a hydraulic fluid with an ISO 32 or ISO 46 viscosity grade. AW-32 (anti-wear, ISO 32) performs better at lower temperatures than AW-46. If you're running AW-46 and see slow cycling in cold mornings, consider switching. Browse our vehicle lifts if a unit is past saving.
• Inspect safety locks and cable/chain: Cold temperatures make rubber seals stiffer and cables less flexible. Test safety lock engagement at full lift height. If a safety lock hesitates or doesn't click cleanly, address it before the season changes.
• Annual safety inspection: If your lift hasn't been inspected this year, schedule it now. ALI recommends annual inspections by a qualified inspector. Running an unserviced lift through a high-demand winter season is a liability you don't need.

A/C Recovery Machines

AC machine usage drops in winter, but cold ambient temperatures affect how the machines behave when you do need them. Refrigerant recovery rates slow significantly in cold conditions because refrigerant vapor pressure is lower. Expect a recovery that runs quickly in July to take noticeably longer in a cold bay.

• Store in a heated area if possible: Check your machine's manual for its storage and operating temperature range. If your shop has a heated storage bay or service room, keep the machines there during winter months.
• Check refrigerant charge level: If the machine has been sitting since summer, verify internal refrigerant charge before the first winter service call. Low internal charge affects recovery efficiency.
• Run a recovery cycle on a known-good system: Before your first customer A/C service of the season, do a test run. (Replacement machines and parts: A/C service equipment.) A machine that sat through a cold storage period occasionally needs one cycle to normalize.

Fluid Dispensing and DEF Handling

DEF (diesel exhaust fluid) freezes at 12°F. In most parts of Texas that's not a routine concern, but it can happen during hard cold snaps in January and February. Freezing itself doesn't ruin DEF. It thaws back to normal. The bigger risks are cracked containers and frozen dispensing lines, and on the other end of the calendar, drums left in a hot bay all summer. Heat and contamination are what break DEF down, and off-spec DEF can trigger SCR fault codes in customer vehicles.

• Check where your DEF lives: Most suppliers recommend storing DEF between about 12°F and 86°F, out of direct sun. Make sure drums and totes are sealed, and that dispensing lines and nozzles won't freeze in an unheated bay.
• Don't store DEF in metal containers: DEF is corrosive to carbon steel. Use only HDPE or stainless steel containers. Winter is a good time to audit what you're storing it in.
• Check all hose reels and dispensing pumps for cold-weather operation: Rubber hoses stiffen in cold temperatures. Inspect for cracking at connection points, and verify that pump operation hasn't slowed from cold grease in the motor.

A Simple October Walkthrough

• Compressor: Drain tank. Test auto-drain. Replace intake filter. Check oil viscosity. Verify minimum operating temp rating.
• Vehicle lifts: Check hydraulic fluid level and condition. Verify viscosity grade. Inspect cables/chains and safety locks. Schedule annual inspection if not yet done.
• A/C machines: Move to heated storage. Check refrigerant charge. Run one test cycle before first service call of the season.
• Fluid/DEF system: Check DEF storage location and seals. Inspect hose reels and pump operation. Confirm container material is compatible.
• Shop environment: Verify heating is operational and set appropriately for equipment minimum temps. Address any door seal gaps that let cold air pool near compressors or lift cylinders.

Need help with a pre-winter PM visit, hydraulic fluid service, or any equipment inspection before the season changes? Call Alamo at (817) 865-3707 or visit our preventative maintenance page. We'd rather catch the problem in October than get a call in January.