Acura Integra Engine Coolant Bypass Hose: A Guide for 1995-2001 Models
Learn how to spot a failing engine coolant bypass hose on your 1995-2001 Acura Integra and choose the right replacement part.
- Failure is due to age; symptoms include leaks, sweet smells, and overheating.
- Always use a pre-molded aftermarket hose from a quality brand like Gates, Continental, or Dayco; generic hoses will kink.
- The OEM part (19508-P72-000) is discontinued, making aftermarket your primary choice.
- After replacement, you must bleed all air from the cooling system to prevent overheating.
Symptoms of a Failing Engine Coolant Bypass Hose
After decades of exposure to heat and pressure, the original rubber hoses on a 1995-2001 Integra will degrade. Failure of the coolant bypass hose is a common issue due to age. Watch for these clear warning signs:
- Coolant Leaks: This is the most common symptom. You may find puddles of green or blue coolant on the ground, often near the back of the engine. The hose itself may look cracked, swollen, or feel mushy.
- Sweet Smell: Leaking coolant has a distinct, sweet smell. If you notice this odor around the engine bay, a hose is likely the culprit.
- Steam from Engine: If leaking coolant drips onto hot engine components, it will turn into white steam or smoke, which you might see rising from under the hood.
- Engine Overheating: A significant leak will cause the coolant level to drop, leading to your engine overheating. This is a serious condition for any Integra; do not ignore the temperature gauge. Driving an overheating engine can lead to a blown head gasket or other permanent damage.
Do Not Drive with a Major Coolant Leak
A small seep might allow a short trip to a repair shop, but a steady drip or stream means the car should not be driven. Sudden hose failure can cause rapid coolant loss and lead to catastrophic engine damage in minutes.
Choosing the Right Aftermarket Bypass Hose
The original OEM bypass hose for the GS-R, part number 19508-P72-000, is now discontinued by Acura. This makes high-quality aftermarket parts the only option for a new replacement. For a vehicle of this age, reputable aftermarket brands offer excellent quality, often meeting or exceeding original specifications.
Molded vs. Generic Hose: Always use a pre-molded hose specifically designed for your Integra model. The bypass hose has specific bends to fit in a tight space. Using a generic straight hose will cause it to kink, blocking coolant flow and leading to overheating.
Aftermarket Brand Quality
For the 1995-2001 Acura Integra, several well-regarded brands produce this hose. Based on general reputation and owner experiences in forums, here is an honest assessment:
- Tier 1 (Excellent Quality): Gates and Continental are widely seen as top-tier choices for belts and hoses. They are known for using high-quality EPDM rubber that resists degradation and for manufacturing hoses that fit correctly without modification.
- Tier 2 (Good Quality): Dayco is another established OEM supplier and a reliable choice. While most users find their products to be good, occasional forum posts mention that the shape of some molded hoses may be slightly less precise than Gates or OEM. However, for a simple bypass hose, it is generally considered a dependable option.
Estimated Replacement Costs
The cost to replace the engine coolant bypass hose is relatively low. The part itself is inexpensive, and labor is minimal for an experienced mechanic.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Bypass Hose | $19.48 - $29.85 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions (FAQ)
Is replacing the coolant bypass hose a DIY job?
Yes, for those with basic mechanical skills and tools, this is a very feasible DIY project. It involves draining a small amount of coolant, using pliers to release the hose clamps, and swapping the hose. The most important part of the job is properly bleeding the air out of the cooling system afterward.
Why is my engine overheating after replacing the hose?
You most likely have air trapped in the cooling system. Air pockets can prevent coolant from circulating properly. To fix this, you need to "burp" the system. With the engine cool, remove the radiator cap, start the car with the heater on high, and let it idle. As it warms up, squeeze the upper and lower radiator hoses to help push air bubbles toward the radiator opening. Top off the coolant as the level drops and continue until no more bubbles appear.
Should I replace the hose clamps too?
Yes, it is highly recommended. The original spring-style clamps can lose tension over time and may not seal properly on a new hose. Replacing them with new spring clamps or quality worm-gear style clamps is cheap insurance against future leaks.
Are there any recalls for the Integra coolant bypass hose?
No, there are no recalls or Technical Service Bulletins (TSBs) from Acura or the NHTSA for this specific part on the 1995-2001 Acura Integra. Any failures are considered part of normal wear and tear for a vehicle of this age.
Technical Specifications
OEM Part Numbers: 19508-P72-000
Material: EPDM Rubber Molded: Yes Inside Diameter: Approx. 16mm (5/8 in)
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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