A/C REPAIR
RV Air Conditioner Repair — Mobile Service in Stockton & the San Joaquin Valley
When your rooftop A/C starts blowing warm in 105° Stockton heat, the trip you planned is over until it's fixed. I'm a mobile RV tech — I come to your motorhome, camper or travel trailer wherever it sits, diagnose the unit on the spot, and quote you the price before I turn a wrench. Most A/C jobs finish the same day, in your driveway, storage lot, campground or marina. No towing, no service bay, no waiting three weeks for an appointment.
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Coleman Mach rooftop units — start and run capacitors, fan motors, control boards
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Furrion, Advent and Airxcel units
What I Repair...
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Compressor relays and hard-start / soft-start installs
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Thermostats, mechanical and digital
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Evaporator and condenser coil cleaning
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Gaskets and shrouds — UV-brittled shrouds crack and let the condenser fan pull wrong
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Dometic rooftop and ducted systems
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Soft start installs so a generator or 30-amp shore power can run the A/C
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Full unit replacement when the compressor is genuinely dead
RV AC Blowing Warm or Cold Air?
Why Is My RV Air Conditioner Blowing Warm Air?
Fan runs, air isn't cold. Nine times out of ten that's a failed run capacitor or a compressor that's drawing too much. I test capacitor and compressor draw before recommending anything — sometimes it's a $40 part, not a $1,500 unit.
RV A/C Cools in the Morning But Not the Afternoon
Cools in the morning, quits by afternoon. Out here that's almost always coils packed with ag-field dust and cottonwood. A deep coil clean fixes it without parts more often than not.
Frozen Evaporator Coil on an RV Air Conditioner
Frozen evaporator coil. Low airflow, a clogged filter, leaking ducts, or a slightly low charge. Thawing it doesn't fix it — finding the airflow restriction does.
Common Problems I See
Blowing warm air, fan still runs
Usually a failed run capacitor or a compressor that won't start. I test the capacitor and compressor draw before recommending anything; sometimes it's a $40 part, not a $1,500 unit.
Trips the breaker the second it starts
Compressor short to ground, or a failed soft start. I isolate whether it's the unit or your shore power first.
Runs but barely cools in the afternoon
Coils packed with ag-field dust and cottonwood is the number one cause out here. A deep coil clean often fixes it without parts.
Frozen evaporator coil
Low airflow from a dirty filter or duct leak, or a slightly low charge. Freezing is a symptom, not the problem.
Thermostat does nothing
Failed control board, bad thermostat, or a broken comms wire. I test the board before selling you a thermostat.
Shroud cracked and rattling
UV-brittled shrouds let the condenser fan pull wrong. Quick replace before it damages the coil fins.
RV AC Blowing Warm or Cold Air?
Central Valley–Specific Notes
Central Valley summer heat is brutal on rooftop units — 100°+ days mean a marginal A/C fails fast. Add the dust off the ag fields around Lodi, Manteca, and Stockton and condenser coils clog weeks faster than they do in cooler climates. Storage-lot rigs sit in full sun with no shade, so the units cycle harder and capacitors cook. I clean coils down to bare metal and check capacitor values, not just 'does it run.' A soft start install is worth it out here if you run on a generator or 30-amp pedestal.
Can you fix my A/C the same day?
Same-day service is available most days, especially if you call or text early. If I need to order a compressor or full unit, I'll tell you up front and quote the timeline before you commit.
Should I replace the whole unit or just the capacitor?
I test first and quote before I turn a wrench. If the compressor's dead, a new unit makes sense. If it's a capacitor or control board, you're looking at a fraction of that.
Will a soft start let me run two A/Cs on 30-amp power?
A soft start drops the startup surge on one unit so a 30-amp pedestal or smaller generator can handle it. Running two at once on 30 amps still isn't safe, but one with a soft start is realistic.
Do you work on basement (basement-air) systems?
Yes, ducted basement systems and standard rooftop units both.
How the On-Site Visit Works
You Call or Text
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You call or text, we pick a time, and I drive to where the RV is parked: driveway, storage lot, campground, marina, or roadside.
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I diagnose and quote on the spot
the real diagnosis, the real price, before any work begins. No surprise line items.
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I repair, usually in one visit
I carry the common parts, so most A/C jobs finish the same day where the rig sits
Serving Stockton & the Central Valley
I'm based in Stockton and cover roughly 50 miles out. I serve Stockton, Lodi, Manteca, Tracy, Modesto, Lathrop, French Camp, Mountain House, Brentwood, Discovery Bay, and Livermore.
Phone: (209) 901-7667 | Email: rob@on-site-rv.com | Hours: 7:00 AM – 9:00 PM daily | Service area: Stockton and roughly 50 miles out.
INCLUDED:
House-side RV systems
Mobile — I come to you
NOT INCLUDED:
Engines / drivetrain
Towing