I have a coolant leak in my bipass hose

Tiny
ANONYMOUS
  • MEMBER
  • 1997 NISSAN QUEST
  • 190,000 MILES
I have a coolant leak in my bipass hose. What are the steps in replacing it?
Saturday, November 17th, 2012 AT 1:17 PM

1 Reply

Tiny
HMAC300
  • EXPERT
Drain t he clooling system, and replace the hose. Fill with coolant then follow these steps.
1. Loosen┬ engine┬ and┬ radiator┬ air┬ relief┬ plugs.┬ Remove┬ heater┬ pipe┬ air┬ relief┬ cap.┬ See Fig.┬ 4┬.┬ Connect┬ one┬ end┬ of┬ 40"┬ clear, ┬ heat┬ resistant┬ hose┬ to┬ heater┬ pipe┬ relief.┬ Fill┬ coolant┬ reservoir┬ to┬ MAX┬ mark┬ and┬ place┬ hose
from┬ heater┬ pipe┬ air┬ relief┬ into┬ coolant┬ reservoir.┬ Ensure┬ hose┬ is┬ below┬ coolant┬ level┬ at┬ all┬ times.
2. Slowly┬ add┬ coolant┬ through┬ radiator┬ filler┬ neck, ┬ allowing┬ several┬ minutes┬ for┬ air┬ to┬ escape.┬ When┬ coolant┬ starts┬ to┬ drip┬ from┬ radiator┬ air┬ relief┬ plug, ┬ close┬ plug.┬ Tighten┬ plug┬ to┬ 15 19┬ ft.┬ Lbs.┬ (20 26┬ N.M).
3. Continue┬ adding┬ coolant┬ while┬ gently┬ moving┬ upper┬ radiator┬ hose┬ up┬ and┬ down┬ until┬ coolant┬ level┬ no┬ longer┬ drops┬ in┬ filler┬ neck.┬ Place┬ wire┬ under┬ radiator┬ filler┬ cap┬ negative┬ pressure┬ relief┬ valve.┬ See Fig.┬ 6┬.┬ DO
NOT┬ install┬ cap┬ at┬ this┬ time.
4. Start┬ engine┬ and┬ run┬ at┬ 2000┬ RPM┬ for┬ 10 15┬ minutes┬ or┬ until┬ lower┬ radiator┬ hose┬ becomes┬ hot.┬ If┬ coolant┬ comes┬ out┬ of┬ engine┬ air┬ relief┬ plug, ┬ close┬ plug.┬ Tighten┬ plug┬ to┬ 15 19┬ ft.┬ Lbs.┬ (20 26┬ N.M).┬ If┬ coolant┬ in
radiator┬ neck┬ lowers, ┬ add┬ coolant.┬ If┬ coolant┬ overflows┬ filler┬ neck, ┬ install┬ radiator┬ cap┬ (with┬ wire┬ installed).
5. Close┬ engine┬ air┬ relief┬ plug┬ if┬ not┬ already┬ done.┬ Stop┬ engine┬ and┬ allow┬ to┬ cool┬ down┬ completely.┬ Refill┬ radiator┬ and┬ reservoir┬ as┬ necessary.┬ Ensure┬ radiator┬ cap┬ (with┬ wire)┬ is┬ installed.┬ Start┬ engine┬ and┬ warm┬ to
operating┬ temperature.┬ If┬ engine┬ temperature┬ raises┬ above┬ normal, ┬ stop┬ engine┬ and┬ repeat┬ this┬ step.

NOTE: Ensure┬ coolant┬ level┬ in┬ reservoir┬ tank┬ is┬ maintained┬ at┬ MAX┬ mark┬ for┬ the┬ following┬ steps.

6. On┬ vehicles┬ without┬ rear┬ heater, ┬ ensure┬ temperature┬ control┬ lever┬ is┬ in┬ full┬ HOT┬ position.┬ Select┬ any┬ fan┬ speed┬ and┬ mode┬ except┬ OFF.┬ Run┬ engine┬ at┬ 3000┬ RPM┬ for┬ 5┬ minutes┬ or┬ until┬ outlet┬ air┬ is┬ hot.┬ Repeat┬ this
step┬ at┬ least┬ 3┬ times.┬ Ensure┬ no┬ water┬ noise┬ is┬ present┬ in┬ heater┬ core.
7. On┬ vehicles┬ with┬ rear┬ heater, ┬ run┬ engine┬ at┬ 3000┬ RPM┬ with┬ front┬ temperature┬ control┬ lever┬ in┬ full┬ COLD┬ position.┬ Move┬ rear┬ temperature┬ control┬ lever┬ to┬ full┬ HOT┬ position.┬ Select┬ any┬ fan┬ speed┬ except┬ OFF.┬ Run
engine┬ 5┬ minutes┬ or┬ until┬ rear┬ outlet┬ air┬ is┬ hot.
8. Move┬ rear┬ temperature┬ control┬ lever┬ to┬ full┬ COLD┬ position.┬ Move┬ front┬ temperature┬ control┬ lever┬ to┬ full┬ HOT┬ position.┬ Select┬ any┬ fan┬ speed┬ and┬ mode┬ except┬ OFF.┬ Run┬ engine┬ 5┬ minutes┬ or┬ until┬ front┬ outlet┬ air┬ is
hot.┬ Repeat┬ steps┬ 7)┬ and┬ 8)┬ at┬ least┬ 3┬ times.┬ Ensure┬ no┬ water┬ noise┬ is┬ present┬ in┬ front┬ or┬ rear┬ heater┬ core.
9. On┬ models┬ equipped┬ with┬ automatic┬ A/C, ┬ operate┬ engine┬ at┬ 3000┬ RPM┬ with┬ front┬ climate┬ control┬ set┬ at┬ 60┬░F┬ and┬ rear┬ A/C┬ control┬ unit┬ temperature┬ switch┬ to┬ full┬ WARM┬ position┬ with┬ fan┬ on┬ for┬ 5┬ minutes┬ or┬ until
rear┬ outlet┬ air┬ is┬ hot.┬ Turn┬ rear┬ control┬ unit┬ to┬ full┬ COOL┬ position┬ and┬ set┬ front┬ climate┬ control┬ to┬ 90┬░F┬ until┬ front┬ outlet┬ air┬ is┬ hot.┬ Repeat┬ process┬ at┬ least┬ 3┬ times┬ until┬ no┬ water┬ noise┬ is┬ heard┬ at┬ heater┬ core.
10. On┬ all┬ models, ┬ stop┬ engine.┬ Fill┬ coolant┬ reservoir┬ to┬ MAX┬ mark.┬ Let┬ engine┬ cool┬ down.┬ Remove┬ radiator┬ cap┬ and┬ remove┬ wire┬ from┬ negative┬ pressure┬ valve.┬ Fill┬ radiator┬ as┬ necessary┬ and┬ reinstall┬ radiator┬ cap.
Remove┬ hose┬ from┬ heater┬ pipe┬ relief┬ and┬ quickly┬ install┬ cap┬ on┬ pipe.┬ Fill┬ reservoir┬ as┬ necessary┬ and┬ install┬ reservoir┬ cap.
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Saturday, November 17th, 2012 AT 2:02 PM

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