Symptoms of a Bad or Failing Heater Bypass Tube

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Cost of Replacing a Bad or Failing Heater Bypass Tube

If you see coolant leaking under your car or smell coolant from your car, you may need to replace the heater bypass tube. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Car Heater Bypass Tube Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2008 Ford Ranger $112 $42.09 $70.00 25% $149.59
2006 Ford Ranger $112 $42.09 $70.00 25% $149.59
2006 Mercury Montego $102 $32.29 $70.00 26% $139.79
2006 Mercedes-Benz S500 $247 $43.71 $203.00 30% $355.46
2004 Mercedes-Benz S500 $247 $43.71 $203.00 30% $355.46
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How to Diagnose a Bad or Failing Heater Bypass Tube?

heater bypass tube

The heater bypass tube is a cooling system component found on many road going cars and trucks. It’s purpose is to serve as a cooling system passage that bypasses the thermostat, so that there is coolant flow even when the engine thermostat is closed. The coolant bypass tube provides a passage for minimum coolant flow, so that the engine does not overheat from insufficient cooling when the thermostat is closed and restricting coolant flow.

While servicing the bypass tube is not generally considered routine maintenance, it is still prone to the same issues that all cooling system components are susceptible to, and can sometimes require attention. Usually a faulty heater bypass tube will produce a few symptoms that can alert the driver of an issue.

Coolant smell

One symptom of an issue with heater bypass tube is a coolant smell from the engine bay. Most heater bypass tubes use an o-ring or gasket to seal the bypass tube to the engine. If the o-ring or gasket wear out or tear, coolant will begin to leak from the bypass tube. This may produce a coolant smell from the vehicle’s engine bay. Some coolant bypass tubes are located near the top of the engine, and as a result may produce a coolant smell far before any coolant can be visibly detected without opening the hood.

Coolant leak

The most common symptom of an issue with the heater bypass tube is a coolant leak. If the bypass tube gasket or o-ring become damaged, or the bypass tube leaks due to excessive corrosion it may cause a coolant leak. Depending on the severity of the leak, coolant may or not leak onto the floor or underneath the vehicle. A faulty gasket or o-ring may require a simple replacement of the seal, while a corroded tube will usually require replacement.

As the coolant bypass tube is a component of the engine’s cooling system, it’s failure can lead to engine overheating and potential serious engine damage. If your vehicle’s bypass tube is leaking, or has another issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the bypass tube requires replacement.

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Recent Car Heater Bypass Tube Replacement reviews

Excellent Rating


YourMechanic Car Heater Bypass Tube Replacement Service

Average Rating

4.4/5

Number of Reviews

20

Rating Summary
19
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1
19
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1

Juan

7 years of experience
125 reviews
Juan
7 years of experience
Juan is awesome. Very knowledgeable and professional, he is thorough and polite. I'll be getting my services from him. Thanks Juan and take care.
2009 MINI COOPER - HEATER BYPASS TUBE - LONG BEACH, CALIFORNIA

Richard

10 years of experience
334 reviews
Richard
10 years of experience
Richard was also great honest, knowledgeable, hardworking It was very hot out in the driveway where he worked on my car and he went above and beyond I greatly appreciated his hard work and my air conditioner works better than ever Thanks Richard
2007 BUICK LACROSSE - HEATER BYPASS TUBE - LAS VEGAS, NEVADA

Scott

33 years of experience
434 reviews
Scott
33 years of experience
Scott was great! He arrived on time and completed the work sooner than expected. He also found another issue in my car that I had no clue about. I completely would recommend him! Its really hard to find a trust worthy mechanic that doesn't cost a fortune!
2005 BUICK LESABRE - HEATER BYPASS TUBE - CHANDLER, ARIZONA

Scott

33 years of experience
434 reviews
Scott
33 years of experience
Another great job was done by Scott. Completely satisfied exemplary job. Definitely will call again!
1998 LEXUS GS300 - HEATER BYPASS TUBE - GILBERT, ARIZONA

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