Symptoms of a Bad or Failing Coolant Reservoir

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The coolant reservoir is the plastic reservoir mounted in the engine bay that stores the coolant for the engine. Coolant reservoirs are required because engines go through cycles of expelling and absorbing coolant as they warm up and cool down. When the engine is cold, the pressure of the cooling system is low and more coolant is required, and when the engine is warm the pressure of the cooling system is increased and therefore less coolant is required.

For some vehicles, the coolant reservoir is an integral part of the system, and since it is also pressurized, the coolant reservoir becomes an even more important component to engine safety. Because the coolant reservoir is part of the cooling system, when it has any issues it can quickly lead to issues with the engine. Usually a bad or failing coolant reservoir will produce a few symptoms that can alert the driver that a problem has occurred and should be serviced.

1. Constantly low on coolant

One of the first symptoms commonly associated with a bad or failing coolant reservoir is the need to constantly add coolant. If the reservoir cracks or develops any small leaks it can cause the coolant it is storing to leak or evaporate at a slow rate. The leaks may be small enough that they may not be obvious to the driver, however, over time they will cause the reservoir to empty out. The constant need to add coolant can also be caused by a leak somewhere else on the engine so a proper diagnosis is recommended.

2. Coolant leaks

Another symptom of a potential problem with the coolant reservoir is coolant leaks. If the coolant reservoir cracks or breaks due to old age or overheating it will leak. Small leaks may produce steam and drips, while larger leaks will produce streams and puddles, as well as an obvious coolant odor.

2. Engine overheating

Another more serious symptom of a bad or failing coolant reservoir is the engine overheating. If the coolant reservoir has any issue that prevents it from properly holding coolant, or from properly pressurizing the system it may cause the engine to overheat. Any issue that causes engine overheating should be addressed as soon as possible in order to prevent any possible damage to the engine.

The coolant reservoir is a simple but important component of the cooling system, and when it has issues it can quickly lead to overheating and even engine damage. For this reason, if you suspect that your coolant recovery reservoir may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic. They will be able to determine if the car needs a coolant reservoir replacement.


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Recent Coolant is leaking Inspection reviews

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YourMechanic Coolant is leaking Inspection Service

Average Rating

4.8/5

Number of Reviews

1,134

Rating Summary
1,050
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31
1,050
38
5
10
31

Victor

33 years of experience
97 reviews
Victor
33 years of experience
Ford Edge - Coolant is leaking - Albuquerque, New Mexico
Victor was very thorough and explained everything to me as he went along. He was patient when I didn't understand and took his time to ensure I had a clear picture about how my engine blew. Very friendly, nice and most important....knowledgeable. I would work with him again.
Toyota 4Runner - Coolant is leaking - Albuquerque, New Mexico
Very professional! My truck is running great!! Would definitely call on my mechanic again to fix little red. Awesome Experience... thank you Victor..

Chris

20 years of experience
1610 reviews
Chris
20 years of experience
Saab 9-3 - Coolant is leaking - San Juan Capistrano, California
I appreciated that Chris arrived earlier than appointment time. He was very knowledgeable, professional and personable and provided me with all the information I needed regarding what my car needed to fix the problem. I would highly recommend Chris!

Arturo

25 years of experience
31 reviews
Arturo
25 years of experience
Chevrolet Cruze - Coolant is leaking - San Diego, California
Very knowledgeable with the diagnostic . Friendly and trust he will do a great job on the car repairs.

Andrew

10 years of experience
20 reviews
Andrew
10 years of experience
BMW 323i - Coolant is leaking - Cape Coral, Florida
Andrew is knowledge and performed the diagnosis an presented proposal quickly. He worked to get parts lined up and scheduled the repair for tomorrow. Excellent experience.

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