Cooling System Service: What It Does and When You Need It
Your cooling system works hard and asks for very little. A quick look at what it's actually protecting, and when it's worth a service.
Your engine runs hot — hot enough that it needs an entire system dedicated to carrying that heat away. That's the cooling system, and it's working every mile you drive, holding the engine in a temperature range where it runs its best.
It's easy to forget about precisely because it does its job so well. A little attention now and then is really all it asks for, and it pays that back over the life of the car.
Here's what a cooling system service does, and how to know when yours is due for one.
What the service actually does
Coolant isn't just colored water. It's loaded with additives that wear out, and once they're gone the fluid stops doing most of its job. A service swaps out the tired fluid and checks the parts moving it around. Three things come out of that:
Prevents overheating
Fresh coolant moves heat away efficiently, so your engine holds a steady temperature in stop-and-go traffic, on long drives, and through a Murrieta summer.
Stops corrosion
Those additives keep the radiator, water pump, and every passage in between clean and protected. Fresh coolant keeps that protection at full strength.
Protects in extreme temperatures
The right mix boils higher and freezes lower than plain water, so your engine stays comfortable in August heat and on a cold morning alike.
When to bring it in
The good news is that cooling systems tend to give you plenty of warning. Any of these are worth a quick look:
- Temp gauge sitting higher than normal, or creeping up when you stop moving
- A puddle under the car — green, orange, or pink
- That sweet, almost syrupy smell after you park
- Heater blowing cool when it should be blowing hot
- Topping off the reservoir more often than usual
- The temperature warning light coming on
A note on European cars
BMW, Mercedes, Audi, VW — each one specifies its own coolant formulation, engineered for that particular system. Using the fluid your car was built for is the simplest way to keep its corrosion protection working exactly as intended.
These systems also use a fair amount of plastic: expansion tanks, thermostat housings, coolant flanges. They hold up well, and they respond nicely to periodic attention as the miles add up. A seal that's just beginning to weep is a quick, inexpensive fix when it's spotted early — which is one of the better arguments for having someone look the system over now and then.
That's why we go by manufacturer spec. It's the most reliable way to keep everything working the way it was designed to.
We'll tell you if you don't need it
Not every car that comes through the door needs this, and the intervals differ from one make to the next. We'll look the system over, tell you what we found, and if everything's in good shape, we'll say so and send you on your way. That's just how we'd want to be treated.
Frequently asked questions
What does a cooling system service include?
How often should coolant be replaced?
Can I just top off the coolant myself?
Does the cooling system matter in hot weather only?
Is any coolant fine to use?
Not sure where yours stands?
Bring it by and we'll check it out. If it needs service we'll tell you. If it doesn't, we'll tell you that too.
Schedule a VisitQuestions about coolant or anything else on the car? Just ask.