A split like this tells you something useful. If the driver vent is cold and the passenger vent is warm, the compressor is probably doing its job and the refrigerant is getting cold. The trouble is in how the air gets mixed and sent to each side.

Inside the dash, a door called the blend door mixes cold air from the evaporator with warm air from the heater core. Cars with dual-zone climate control have one for each side, each moved by a small electric motor. If that motor fails or loses its position, one side can get stuck on heat. A low refrigerant charge can also cause uneven cooling, since part of the evaporator stops getting cold.

We check both possibilities before anything gets replaced, right in your driveway in Keller. You get cold air back without giving up your car for a day.

How it works

Call or text

Tell us the year, make and model and what the vehicle is doing.

Get a price

You hear the price before any work starts.

We come to you

The repair happens where the vehicle is parked. Bigger jobs get scheduled.

Warning signs

Signs the problem is behind the dash

Clicking or tapping behind the glove box

A blend door motor that has stripped its gear or lost its place.

One side cold, one side warm

The blend door on the warm side may be stuck toward heat.

Temperature knob does nothing on one side

An electrical fault or a failed door motor on that side.

Both sides lukewarm and slowly getting worse

More likely a low charge from a slow leak than a door problem.

Warm side switches after a restart

A door motor resetting itself, or a loose electrical connection behind the dash.

How it works

How we sort out a one-sided AC problem

Text or call and tell us which side blows warm, whether it happens all the time, and if you hear clicking from the dash. Those details narrow things down before we even arrive.

At your car, we compare vent temperatures side to side, check how the system is cooling, and command each blend door through its range to see which one refuses to move. We also scan for stored codes, since many climate systems log one when a door motor fails. Once we know the cause, we give you a price, and nothing gets done until you agree to it. Plenty of dash-side repairs happen right there in the driveway. If the job means taking the dash apart, we schedule a time that works for you.

Around Keller

When to call about uneven cooling

A one-sided AC problem is safe to drive with. It is uncomfortable for whoever sits on the warm side, and a clicking door motor can strip further over time, but nothing else on the car is at risk. Call when it starts bothering you. When you text, mention whether the problem changes with the temperature setting or the fan speed.

We cover all of Keller

Your driveway, your work lot or the roadside, anywhere in Keller. Call or text with the year, make and model and what the vehicle is doing.

Call 817-709-1357

Why Day's

Shop-level work, where you park.

We bring dealer-level diagnostic tools, including a lab scope and a thermal camera, to wherever your vehicle is parked.

Fords are our specialty, built on years of maintaining a construction company's fleet, from cars and light trucks to heavy-duty work trucks.

About Day's

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Questions

Car AC questions from Keller.

Why does my car AC blow cold on the driver side only?

On dual-zone systems, each side has its own blend door and motor. If the passenger door sticks toward heat, that side stays warm while yours stays cold. A low refrigerant charge can do something similar. We test for both so you pay for the right repair. Text us what you are noticing.

Can a blend door problem be fixed in my driveway in Keller?

Often it can. Some door motors are reachable behind the glove box or under the dash, and we handle those where the car sits. Others are buried deep in the dash and take longer, so those get scheduled. We will tell you which kind you have and the price before starting. Call or text to set it up.

What is that clicking sound behind my dashboard?

A steady clicking or tapping that comes and goes with the AC or heat is often a blend door motor with broken teeth on its gear. It keeps trying to reach a position it cannot hold. It does no harm to the engine, but it is annoying and usually comes with uneven air. Send us a text describing it.

Will both sides match again after the repair?

That is the goal. Once the door and its motor work again, the system can recalibrate and each side should follow its own setting. If a low charge was part of the problem, we will tell you that as well, since a leak would need its own attention. Request a work order and we will check it.