It’s 98 degrees, the steering wheel is too hot to touch, and you turn the key — nothing. Or a weak, grinding crank that never quite catches. In the Houston area, a car that won’t start in summer heat is one of the most common roadside calls we get. Here’s what’s usually going on, how to stay safe and comfortable, and what to do next.
Why Texas heat kills car batteries
Most people think of cold weather as the battery killer, but heat does more of the long-term damage. High temperatures speed up the chemical reactions inside a lead-acid battery, which wears out the internal plates and evaporates the electrolyte faster. A battery can feel fine for months and then fail with almost no warning, often on the first really hot week of the year or after the summer has already done its damage.
Heat also adds load. The A/C works harder, short trips don’t give the alternator time to recharge, and engine bays in a Texas parking lot get far hotter than the air. A tired battery can give out in a grocery store lot on an ordinary afternoon.
Step 1: Get safe and stay cool
Before you troubleshoot anything, take care of yourself and anyone with you.
- If you’re on a road or shoulder, turn on your hazards. On a busy road like I-45, FM 1960 or the Grand Parkway, stay in your car with your seatbelt on if it isn’t safe to get out.
- If you’re in a parking lot or driveway, don’t sit in a closed car in the sun. A parked car can heat up dangerously fast. Wait in shade or inside a nearby store.
- Never leave children, older adults or pets in a car that won’t run its A/C. If anyone is showing signs of heat illness — dizziness, confusion, nausea, heavy sweating or no sweating at all — call 911.
- Drink water if you have it. It’s worth keeping a couple of bottles in the car all summer.
Step 2: Figure out what you’re hearing
What the car does when you turn the key (or push the start button) tells you a lot.
Rapid clicking, dim lights
This is the classic sign of a weak or drained battery. There’s enough power to click the starter relay but not enough to spin the engine. A jump start will usually get you going.
Slow, labored crank
The engine turns over slowly, like it’s struggling. Again, usually a weak battery — sometimes a battery on its last legs that got through the morning but not the afternoon.
Nothing at all — no lights, no sound
Could be a fully dead battery or a loose or corroded battery connection. If you’re comfortable and the engine is off, you can look at the battery terminals for white or green crusty buildup. Don’t touch the terminals with bare hands if they look damaged or if the battery is swollen or leaking.
Normal crank, but it won’t fire
If the engine spins at a normal speed but never starts, the battery is probably fine. The problem is more likely fuel — including simply running out of gas — or an ignition or sensor issue. If there’s any chance the tank is empty, we also offer fuel delivery.
Dash lights up, push-button start does nothing
On push-button cars, a weak key fob battery can stop the car from recognizing the key. Check your owner’s manual: many cars let you hold the fob right against the start button to start it anyway.
Step 3: Things worth trying (and things to avoid)
- Turn everything off — headlights, A/C, radio, phone chargers — then wait a minute and try once more.
- Make sure the car is in Park (or the clutch is fully pressed in a manual). Some cars won’t crank if the shifter isn’t fully seated.
- Don’t keep cranking. Holding the key for long stretches or trying over and over can drain what’s left of the battery and overheat the starter.
- Be careful with jumper cables if you’re not experienced. Connecting them in the wrong order or to the wrong points can damage electronics or cause sparks near the battery.
Step 4: Call for a jump start
If it sounds like the battery, the fastest fix is a jump start where you are. Call or text LaCaze Roadside Assistance at (832) 949-4837. We’re open 24/7 and serve Spring, The Woodlands, Klein, Tomball, Magnolia, Conroe, Cypress, Humble, Aldine, Porter and North Houston.
You’ll get an upfront price and an honest arrival estimate before we roll. When we arrive, we connect safely, get the engine running and stay until you’re back on the road. Text us a map pin, or use the “Use my location” button on our request form, so we can find you quickly — even in a big lot.
Step 5: After the jump — what next?
Getting started is step one. A battery that died once in the heat will often die again.
- Drive for a while — at least 20 to 30 minutes if you can — so the alternator can put some charge back in.
- Avoid shutting the engine off at quick stops until you’ve had a chance to recharge.
- Get the battery and charging system tested soon. Many auto parts stores test batteries for free.
- Check the age. Many batteries have a date sticker. In Texas heat, a battery that’s a few years old may be near the end of its life.
How to prevent a heat-related no-start
- Park in shade or a garage when you can, and use a windshield sunshade.
- Keep battery terminals clean and tight.
- Pay attention to warning signs: slow cranking, dimming headlights at idle, or a battery light on the dash.
- If your car sits for long stretches, drive it regularly or ask a mechanic about a battery maintainer.
Car won’t start right now? Call (832) 949-4837 — a real person answers, 24/7.