Question about 1990 Oldsmobile Cutlass Ciera

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Heater core burned out and I want to bypass the coolant hoses.

My oldsmobile cutlass ciera is leaking coolant into the passanger and drivers floor. I believe it is because the heater core is burned out. I cant afford to fix the core. A mechanic told me I could clamp or connect the coolant hoses and bypass the heater core. How would I go about doing this?

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  • Anonymous Mar 17, 2014

    Bypass the coolant sensor

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Use a short length of 15mm copper pipe and join the heater pipes together where ther connect to teh heater feed pipes in the engine compartment

Posted on May 09, 2009

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Without knowing your car specifically I can suggest the generic way to do it. Locate the two heater hoses going into the firewall, probably on the passenger side. They're the ones that get hot and are about an inch + in diameter. Disconnect. Measure the inside diameter of the hose and purchase a short piece of galvanized or copper pipe (6 inches) at Home Depot. Connect both ends of the hoses to the pipe to form a loop. Secure the hoses so they don't land some place that would cause a problem.

I had this problem on an 85 Tbird. I had heard about a product called Bars Leak and tried it. It worked. No leaks and I kept my heater. You should be able to find it at any parts place at less than $10. Ground black pepper also has worked for me.

Posted on May 09, 2009

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1 Answer

Only warm air comes out of heater on 89 cutlass ciera core blew out, new thermostat what controls air temp in heater system. Lever moves from cold to hot easily but can't tell if it moves anything under...


#1 Listen if you hear the blend door flap open and close if you do then working good.

#2 run car to normal temp and touch both heater hoses and make sure temp is similar if one is hot and the other warm then your heater core is clogged and most likely that can be the problem it build lime from having tap or well water in coolant system distilled water is recommended but who uses that.

#3 run car when cold with cap off @ 2k rpm and top off radiator. Then close cap and continue to rev @2k until normal temp if heater hoses are not equal in temp heater core clogged.

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  1. Disconnect the negative battery cable and drain the cooling system.
  2. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
  3. Allowing residual coolant from the heater core to drain. Cap the openings.
  4. Working inside the vehicle, remove the lower instrument panel sound insulator and look for where the air blows to your feet.
  5. Remove the heater floor outlet duct screws or clips and remove the duct.
  6. Remove the heater core cover by removing the attaching screws and clips.
  7. Remove the heater core cover.
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I need a simple way to change the heater core in a cutlass supreme.


If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
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When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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1 Answer

I need to install a heatercore on a 92 olds cutlass 3.3 engine not sure howto install need instructions on removal and replacement.


  1. Disconnect the negative battery cable and drain the cooling system.
  2. Disconnect the heater hoses from the heater core inlet and outlet connections in the engine compartment.
  3. Allowing residual coolant from the heater core to drain. Cap the openings.
  4. Working inside the vehicle, remove the lower instrument panel sound insulator and look for where the air blows to your feet.
  5. Remove the heater floor outlet duct screws or clips and remove the duct.
  6. Remove the heater core cover by removing the attaching screws and clips.
  7. Remove the heater core cover.
  8. Remove the heater core retainers and remove the heater core
  9. Reverse order to install leaving the covers off at first then connect all hoses, refill and check for leaks before putting covers back.

Jan 17, 2010 | 1992 Oldsmobile Cutlass Ciera

1 Answer

How do you replace the heater core of a 1996 cierra wagon 6 cyl


  1. Remove air cleaner and duct assembly.
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  3. Rotate engine forward on 3100 only.
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Dec 26, 2009 | 1996 Oldsmobile Cutlass Ciera

1 Answer

How do you replace heater core in a 1993 olds cutlass ciera 3.3 L


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2 Answers

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