Question about 1993 Oldsmobile Cutlass Ciera

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

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  • Oldsmobile Master
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First off, you want to drain the coolant until it is at a level below the heater core. Then you want to remove your glovebox screws and the entire assembly. It may be necessary to remove the far right passenger side kneepad retaining bolt/nut.Disconnect all vacuum and electricle connections.It's a very good idea to take some digital pix during the process to assure proper reassembly.Remove both heater hoses keeping track of which went where. Back inside look around for all the housing bolts for the heater/ airflow control box.If you have AC it is not necessary to discharge the system.Remove all the housing bolts(some may be attached from the outside. I cannot, from here explain the location of each bolt, you'll have to keep looking until you find them all.I did neglect to mention to remove any cable driven door connectors also, if it is so equipt. Put an old towel on the floor of the vehicle because there is inevitably going to be a spill of coolant. When the housing is completely free "roll" it out from under the dash as far as posible and you'll see the heater core opening cover. It will have the two hose tubes sticking out, you couldn't miss it if you closed your eyes...lol Remove the 5-6 screws and slide the core upwards. You'll know how to reassemble the unit by using your pix as a reference. Good luck my friend, I hope this was as helpful as needed. Dana

Posted on Sep 12, 2009

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SOURCE: how do i replace the heater core on 1989 olds

If you dont have the experience and you are a beginer dont do it,go to a auto shop that is qualify.

Posted on Oct 21, 2010

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


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  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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  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

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I have a 92 oldsmobile cutlass which I have changed the thermostat on but still have very little heat what could the problem be?


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Feb 22, 2009 | 1993 Oldsmobile Cutlass Ciera

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You can get a Chilton Manual from your Library. The Chilton has Better Instructions than the Haynes Manual. Please Rate my Solution, I need all the Help that I can Get! Thanks!

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