Virtual Technician

What's Wrong With Your Cooler?

Answer a few simple questions to diagnose the problem and get a verified fix (DIY or Pro).

Virtual Technician

What seems to be the main problem?

Common Swamp Cooler Problems

Blowing Warm Air

Usually caused by dry pads, low water, or a failed pump. Check water supply first.

Water Leaks

Often a stuck float valve, cracked pan, or clogged drain. Address quickly to prevent roof damage.

Strange Noises

Squealing = worn belt. Grinding = bad bearings. Rattling = loose parts or debris.

Weak Airflow

Clogged pads, blocked vents, or a failing motor. Clean or replace pads first.

Won't Turn On

Check breaker, thermostat, and motor. Could be electrical or a burned-out motor.

Musty Smell

Mold or algae in pads/pan. Deep clean with vinegar solution or replace pads entirely.

DIY-Friendly Fixes

Replacing cooler pads
Adjusting or replacing float valve
Cleaning mineral buildup
Replacing or tightening belt
Cleaning/unclogging water lines
Replacing water pump

Most homeowners can handle these with basic tools and YouTube tutorials.

Call a Professional

Motor replacement
Electrical issues or wiring
Roof leaks from unit
Ductwork problems
Severe rust or structural damage
Full unit installation/replacement

These involve heights, electricity, or specialized skills. Stay safe.

Prevent Problems: Seasonal Maintenance

Spring Startup Checklist

✓ Remove winter cover (if used)
✓ Inspect pads—replace if stiff, cracked, or smelly
✓ Clean pan and remove mineral deposits
✓ Check belt tension and condition
✓ Test pump and float valve
✓ Oil motor bearings (if applicable)
✓ Run water for 15 min before turning on blower

Fall Winterization Checklist

✓ Turn off water supply at the valve
✓ Drain all water from pan and lines
✓ Disconnect and store pump (prevents freeze damage)
✓ Cover unit or close damper to prevent cold air entry
✓ Inspect for rust—touch up with paint if needed
✓ Turn off breaker to prevent accidental operation
✓ Schedule professional tune-up if needed

Pro tip: Set calendar reminders for the first week of April (startup) and the last week of October (shutdown) to never miss seasonal maintenance.

Safety First

Always turn off power at the breaker before opening your unit or touching any components.
Roof-mounted units require proper ladder safety—never work alone on heights.
If you smell burning or see sparks, shut off power immediately and call a professional.
Water and electricity don't mix—ensure all electrical connections are dry before restoring power.

Frequently Asked Questions

Why is my cooler blowing warm air?

The most common causes: 1) Water isn't reaching the pads (check pump and float valve), 2) Pads are dry or clogged with minerals, 3) High humidity outside (evap coolers can't cool humid air), or 4) Exhaust windows aren't open (hot air can't escape).

How often should I replace the pads?

Aspen pads: Once per season (or twice if you have hard water). Rigid media pads: Every 3-5 years with proper cleaning. Signs you need new pads: stiff texture, visible mineral crust, musty smell, or reduced airflow.

Why does my cooler smell bad?

Musty or fishy smells usually indicate mold or algae growth in the pads or pan. Fix: drain the pan, scrub with a 50/50 vinegar-water solution, and replace pads if the smell persists. Adding cooler tablets to the water can prevent future growth.

My cooler is making a loud squealing noise. What is it?

Squealing is almost always a worn or loose belt. Turn off the unit, check belt tension (should deflect about 1 inch when pressed), and look for cracks or glazing. Replace belts that are worn—they're inexpensive ($10-25) and easy to swap.

Water is dripping inside my house. Is that normal?

No—this is a serious issue. Possible causes: cracked pan, overflow from stuck float valve, or condensation in ducts. Address immediately to prevent ceiling/roof damage. Check float valve adjustment first, then inspect pan for rust holes.

Can I run just the fan without water (vent mode)?

Yes! Most coolers have a "vent" or "fan only" setting. This is useful for circulating fresh air without adding humidity—great for cool mornings or when outdoor temps are comfortable. Just don't run water through dry pads, as this can damage them.