Coolant Reservoir
The coolant reservoir, also called the overflow or expansion tank, holds extra coolant and lets the system expand and contract as the engine heats and cools. Over time the plastic can crack or the cap can fail, leading to leaks, low coolant, and overheating. We replace the reservoir and cap and top off your coolant to keep the system sealed and working properly.
Find a TechnicianCommon causes
- Cracked or brittle plastic reservoir from age and heat
- Leaking or worn reservoir cap
- Loose or broken hose connection at the tank
- Damaged seal or seam allowing coolant to seep out
- Overpressure from a failing cooling system component
Frequently asked questions
What happens if my coolant reservoir is cracked?
A cracked reservoir lets coolant leak out and air get in, which can cause low coolant levels and engine overheating. You'll often see puddles or stains under the car and may need to refill coolant often.
Can I just use sealant instead of replacing the reservoir?
Sealant is only a temporary fix at best, since the tank is under heat and pressure. Replacing the reservoir is the reliable repair that prevents repeat leaks and overheating.
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