Question about 1991 Oldsmobile Cutlass Ciera

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I believe that the heater core blew out. Where are the heater hoses on the Achieva? I want to jump them out until I get it repaired.

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  • angel_coy555 Dec 12, 2008

    i can't figure out how to replace the hearter core

  • troybouzek Dec 31, 2008

    smoke came out of the defroster and the guage started to go up and pegged out before I could get off the road.Then there was a puddle under passenger side of car. Are the heater core hoses the same size? Also, I believe this is the problem.? Correct? I put fluid in the Res. but it kept dripping out. It is still dripping after 3 weeks. Where is the anti-freeze coming from to still be dripping after 3 weeks? I need to know that the motor and New radiator are protected until I can fix this issue. So, I want to pull hoses and connect together and run the motor so I know there is fluid in the system. Any suggestions?

    2.4 Liter / 97 Olds Acheiva / 4 cylinder





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If you put coolant(antifreeze) in the coolant resivoir and radiator and it,s been leaking for 3 weeks be careful. The engine should be low on coolant and it can run hot into the red zone and be destroyed and maybe cause a fire.Look under the hood in front of the firewall,by the rear of the engine . You should see one heater hose that enters the fire wall and another that exits the fire wall. Autozone,etc. will sell you a couple of hose clamps and a little piece of plastic pipe that ypou can use to by-pass the heater. Be aware that you ain,t gonna be able to defrost the windshield,etc. after you by pass the heater. BTW - that 4 cylinder engine is plagued with overheat problems. it,s a factory made disaster.

Posted on Feb 16, 2009

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First you`ll have no heat if you do this,but you already know this. Depending on whether you have a 4or6 cylinder really shouldn`t matter, with a 4 you should be able to see the down below the exhaust on the drivers side under the steering arm on the firewall two black hoses these are what you need to block. Now for the the actual work,raise the the car,drain the fluid. Back by the firewall from underneath you should be able to see the hoses,depending on wether you have the original or the normal screw type clamps they will have to be removed,the screw type are a little easier to take off. If you still have the original clamps auto stores usually have a special locking pliers type tool for making the job a little easier cause these clamps have to be kept open to slide them back on the hose. Once the clamps are out of the way you`ll have to gently pry the hoses off the heater core.Wear protective eyeware as the core will still have fluid in it. Now if you can get or bend a piece of 1/2 inch aluminum tubing to put in the open ends of the hose from the top pull the ends of the tubes up where you can get to them fit in the tube and put on the clamps. It is best to use the screw type clamps because these will have to be tight and unfortunately only one off the tubes are 1/2 inch the other is probably 5/8 inch make shure that once you have connected the piece off tubing to the hoses you position it away from the exhaust pipes and secure it. Also you`ll notice a black pastic box looking thing somewhere along the heater hoses DO NOT MESS WITH IT or you`ll be buying a new heater hose.Good luck Ken

Posted on Dec 26, 2008


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Because is nessesary to REMOVE the INstrument panel.
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I recomend Make a BY PASS. On the Heater tubes.
Or using a Hose routing from one outtlet to the other one.

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Aug 08, 2008 | 1998 Oldsmobile Achieva

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Heater hose (inlet) blew and i need to see a diagram to repair

most vehicles you can get at the heater core hoses from the firewall side of engine. just see where the 2 hoses connect too. but drain cooling system, so you do not have a mess ! good-day !

Dec 06, 2011 | 1998 Ford Expedition

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Can i by pass the heater core

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Oct 31, 2011 | 1998 Cadillac DeVille

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If you can cut the heater hoses off from the heater core at the fire-wall, and then use a piece of pipe or a hose adapter and hose clamps to join or connect the two heater hoses together, then you can actually drive the vehicle until you require heat from the heater core inside the passenger compartment of the vehicle.


Oct 04, 2010 | 2001 Audi A4

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The coolant leaks right back out from a rubber elbow hose on firewall by the heater core. should it be conected somewhere or have a clamp?

if that elbow is very low on the firewall it is a condensation drain for A/C if coolant pours out of there I believe your heater core may be leaking. Do you smell coolant in the cabin? feel free to reply, I should be around most of the day...MK

Oct 02, 2010 | 1996 Oldsmobile Achieva

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Repair heater core

how to installed a heater core on a 97 achieva

May 13, 2010 | 1997 Oldsmobile Achieva

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Is there a bypass on the heater core

Hello bijtj.
There are no bypass hoses on the heater core. Flow of coolant out of the engine and into the core and back to the engine is flowing at all times. The heat inside your car is adjusted by means of a door inside the heater box.
If your intent is to bypass the core because it is leaking you would need to pull the hoses off at the firewall and install a joiner.

Jan 24, 2010 | 1997 Oldsmobile Achieva

1 Answer

My heater doesn't work!

Check operation of the heater core coolant control valve and associated remote control mechanism.
Chech heater coolant hoses are not kinked or crushed,
Check that both inlet and return heater hose is equally warm, as this indicates coolant flow through the heater core.
If no coolant flow:-
Check cooling system is correctly filled, taking care to bleed off any air locks from the system as necessary (with heater coolant valve open);
Check heater core is not blocked- if blocked you may be able to backflush.

Try this link for a free manual:-

Oct 19, 2009 | 1998 Oldsmobile Achieva

1 Answer

Replacing a heater core in a 1994 olds. achieva.

  1. Disconnect the negative battery cable.
  2. Drain and recycle the engine coolant.
  3. Raise and safely support the front of the vehicle.
  4. If necessary, remove the rear lateral transaxle strut mount.
  5. Detach the drain tube, then disconnect the heater hoses from the core tubes.
  6. Carefully lower the vehicle.
  7. Remove the console if equipped.
  8. Unfasten and remove the sound insulators, console extensions and/or steering column filler, as required.
0900c152800a93fc.jpgFig. 1: Unfasten the sound insulator retaining bolts ... 0900c152800a93fd.jpgFig. 2: ... then remove the sound insulator
  1. On some models it may be necessary to remove the steering column opening filler.
  2. Remove the floor or console outlet ductwork and hoses.
  3. Remove the heater core access cover.
0900c152800a93fe.jpgFig. 3: Remove the heater core access cover
  1. Unfasten the heater core mounting clamps/bolts, then extract the heater core from the vehicle.
0900c152800a93ff.jpgFig. 4: Unfasten the heater core retaining bolts; most later models are secured with clamps 0900c152800a9400.jpgFig. 5: Remove the heater core from the vehicleTo install:
  1. Install the heater core, then secure using the clamps/bolts.
  2. Fasten the heater core cover.
  3. Connect the outlet hoses and ducts.
  4. Install the sound insulators, console extensions and/or steering column filler.
  5. Raise and safely support the vehicle.
  6. Install the drain tube and connect the heater hoses to the core tubes.
  7. If removed, install the rear lateral transaxle strut mount, if removed.
  8. Carefully lower the vehicle.
  9. Connect the negative battery cable.
  10. Fill cooling system and check for leaks. Start the engine and allow to come to normal operating temperature. Recheck for leaks and check coolant level. Add if necessary.6d0c523.jpg182943c.jpg164cdd5.jpg8032c04.jpg18be863.jpg

Oct 21, 2008 | 1994 Oldsmobile Achieva Special Edition

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