How Long Does a Coolant Vacuum Valve Switch Last?

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The coolant vacuum valve switch opens when the heater is turned on, and allows coolant from the engine to enter the heater core. This warm air coming off of the engine is what provides you with heat to the interior of your car. The air blows through the vents and can be controlled by switches near the driver and passenger seats.

The vacuum part of the switch helps to regulate the flow of the air coming through the vents. Over time, the coolant vacuum valve switch can become clogged with old coolant or debris. If this happens, the switch may not work properly, which means you may have a very uncomfortable ride if it is not replaced quickly.

There are three parts to the coolant vacuum valve switch. One is attached to the manifold vacuum, a second to the carburetor vacuum, and the third is attached to the vacuum advance on the distributor. While the engine is operating at a normal temperature, the distributor gets ported vacuum, which is zero psi. On hot days when the temperature of the engine can rise really fast, the switch converts the distributor from ported to manifold vacuum. This increases the timing and the engine RPM increases as well.

Once this happens, the coolant flows through the engine and radiator, and the radiator fan speed is increased. The engine temperature immediately goes down to a safe level. After the engine is at the right level, everything returns back to normal until it starts getting too hot or too cold again.

The switch can go bad over time, so if it does, have your coolant vacuum valve switch replaced as soon as possible by an experienced mechanic. You should also be aware of the symptoms the switch gives off before it goes bad so you can be prepared and replace it before it completely fails.

Signs your coolant vacuum valve switch needs to be replaced include:

  • The heat does not warm up like it is supposed to
  • The coolant is leaking inside the vehicle or underneath the vehicle
  • Cold air blows through the vents even if the knob is indicating to blow warm air

If you are experiencing any of the issues above, it may be time to have your car checked. Set up an appointment with a certified mechanic in order to have your problem diagnosed and repaired.


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Arturo

25 years of experience
42 reviews
Arturo
25 years of experience
Volkswagen Tiguan - Brake Pads Replacement (Rear) - La Jolla, California
Arturo was efficient and extremely professional. I'll refer him to friends and family and call him for any issues related to my car. I am very happy with the service!
Kia Forte - Brake Pads Replacement (Front) - San Diego, California
ARTURO is great! very professional , fast, replaced my front brake pads and oil an filter change. everything now works and works well. Brakes have much improved stopping power and engine is smooth and quiet.Arturo is also kind and thoughtful. "Your mechanic" is very fortunate to have Arturo Lopez represent your company. I enthusiastically recommend him and "Your mechanic> as a fine operation Best regards to the Team Peter Marto

Travis

11 years of experience
312 reviews
Travis
11 years of experience
Ford Explorer Sport Trac - Brake Pads Replacement (Rear) - Minneapolis, Minnesota
Travis is great! This is the second time he has come and serviced our truck. I recommend Travis for any service ned you may have!
Subaru Forester - Brake Pads Replacement (Front, Rear) - Rosemount, Minnesota
Thank you Travis for your fast, easy, honest work on my vehicle today!! The first thing you did upon arrival to my home was find me a discount coupon for $50 off my service estimate. You did only what needed to be done in record time. You not only saved me lots of money, but did things in a profession manner. I've been looking for an honest auto mechanic for my whole life and would love for you to be it!! Thank you, thank you, thank you!! You're the best!!!

Scott

32 years of experience
346 reviews
Scott
32 years of experience
Hyundai Sonata - Brake Pads Replacement (Front, Rear) - Denver, Colorado
Arrived on time and worked quickly. Gave me detailed information on his completed work and the details of my car. Answered all of my questions thoroughly.
Lexus IS250 - Brake Pads Replacement (Rear) - Denver, Colorado
Always on time, speedy, professional, and pleasant to interact with. The work is always consistent and we'll done. I can't reccomend Scott highly enough!

Nicholas

9 years of experience
251 reviews
Nicholas
9 years of experience
Lexus GX470 - Brake Pads Replacement (Rear) - Clayton, North Carolina
Nicholas texted me 30 minutes prior to arrival. Showed up on time as scheduled. He confirmed the work that I requested be performed. He completed the work, performed the road tested, and delivered my keys along with recommendations of other work that might be in my best interest. Was very pleasant, professional, and cleaned up after he was done. I was so impressed with the service he performed and the speed at which the services were completed. I have already scheduled a future service with Nicholas and will schedule any and all future repairs with him if he is available.

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