Question about Buick Roadmaster

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Replace heater core on 1992 buick roadmaster - Roadmaster Buick Cars & Trucks

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  • markpascal Dec 18, 2008

    thank you...... core is good.

  • Anonymous Jan 13, 2009

    how to replace the heater core

  • Marvin
    Marvin May 11, 2010

    U must remove the dash assembly to replace the heater core.

  • Anonymous Mar 28, 2014

    What does this code mean?



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It appears I was incorrect about removing the dash assembly, here are the instructions from a Buick owners club.

Under the passenger dash is an access panel that will allow you to remove the heater core, it really isn't that hard, there are lots of little dash screws and panel screws to remove before you get where you need to be but at least it is roomy. The AC evaporator is located by the heater core. I will give you a tip. I changed mine last year and the heater core that I ordered for my 92 Roadmaster was not correct, when I took my old one out and matched it in a book at the local part store, the heater core for my vehicle was listed as a 96 Caprice???? The car has been in my family since it was purchased new and the heater core had never been changed!!!! Explain that one!Oh yeah, one more tip, if your heater core is leaking, this access panel lowers towards you, if there is nasty sweet smelling water in there it will pour all over you, be careful! Caprice parts are the same as a Roadmaster,so if you ever need anything just look up caprices

Posted on Dec 16, 2008

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1992 buick lasabre heater core went out need help step bye step would be nice or picture how to take it off thank you

Posted on Aug 03, 2009


6 Suggested Answers

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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Posted on Jan 02, 2017

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SOURCE: How do I change the heater core in my 1995 Buick

  1. Drain anti_freeze low pressure air through the heater core will help empty it)
  2. Disconnect Heater core hoses on the engine compartment side of the firewall.
  3. Remove cover panel under dash.
  4. Remove dash board brace (small support brace that runs from firewall to glove box shroud surround.)
  5. Remove lower air box section. ( Many small screws so be sure you get them all)
  6. Remove air conditioning evaporator (Some times this requires the disconnection of hoses in the engine compartment, But try to work around that first to avoid having to recharge your air conditioner.)
  7. Remove the heater core mounting straps and screws.
  8. Wiggle the heater core towards the glove box to extract the steel hoses from the firewall bushings/seals.
  9. Be careful not to spill any remaining anti-freeze on the carpet.
  10. If you had a leaky heater core be sure to clean the air box the best you can to keep the anti-freeze smell out of the car.
  11. Reverse this procedure to install the new heater core.
I hope that helps someone in some way. It's not complicated but it is a pain in the rump to be upside down for that long. You may need to take several breaks during this process to give your neck and back a break as well as your knuckles... It's not an easy repair but it is pretty straight forward.

If I left any thing out please feel free to add comments to these instructions. Generally these instructions should cover most years of Buick Roadmasters.

Just an additional note:
If you have to disconnect your air you may have to upgrade your entire system to the new R34 system instead of R12 because of the new environmental laws in some areas. Try to avoid this as best you can because R34 is not as effective in an older systems as it is in newer systems simply because the evaporator and condenser are smaller and they need to be large to transfer the heat in the R34. It's not nearly as effective at the transfer of heat as the environmentally unfriendly R12 was.

Posted on Nov 07, 2009

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SOURCE: 1996 buick roadmaster keeps overheating:

A shotgun approach to repairs can really rack up the bills.

If your symptoms are loss of water and you have replaced the thermostat, you more than likely have an issue with steam. And that steam more than often comes from a bad head gasket. Most head gasket gasket failures seem to be confined to the water side initially, but let it go on bigger damage will occur.
You can buy a litmus test strip to dunk in the coolant. It will indicate if there are exhaust residuals in the water and thus a gasket failure.

However it may just be something simple, given that you have just about replaced everything:

have you given the radiator a good hosing inside and out?
is the radiator fan running when it should be?

Posted on Sep 07, 2008

SOURCE: heater core replacement

OK, Ifound the problem with mine. Dont unplug your air dryer. I checked the 2 hoses coming out from the heater core and still one was hot and the other not hot. The top one comes from the radiator fill tank and the bottom one comes out of the core and goes around to the front and into the water pump. I disconnected both close to the core and could runwater through both directions so upon further examination, I disconnected the hose at the water pump and no water flow. The hose was plugged up with something. Once I cleared it with a hanger and reconnected it I had water flowing through the core and great heat. Hope this is your problem too as it is aneasy fix

Posted on Oct 23, 2008

  • 65 Answers

SOURCE: We have a 1992 Buick Roadmaster Sedan. We are

try to flush the heater core this should fix the problem

Posted on Feb 24, 2010

  • 5 Answers

SOURCE: where is the heater motor

The blower motor is responsible for driving the fan that blows air across the heater core. Advice: If the blower motor is not working, first you must determine if the blower motor is at fault or if the problem lies in the speed control circuit and/or wiring. One of the quickest ways (depending on accessibility) to test a blower motor, is to hot wire it. If you disconnect the wiring harness and apply battery voltage to the blower motor terminals and it does not spin, then you know that the motor is bad. If it spins, you know the problem is somewhere else in the system. Most blower motors will have two wires or terminals, a positive and a ground. Check the repair guide's wiring diagrams to determine which is which. If you do get it backwards, don't worry. Reverse polarity will only cause the motor to run backwards. For testing purposes, if the motor spins in either direction, the problem lies elsewhere. The one wire design gets it's ground through the blower motor mounting, so the single wire or terminal is your positive connection.


Posted on Jun 11, 2011

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1 Answer

Replace fuse dashboard 1992 buick roadmaster

press the helpful button and check links below, it is a 1993 manual, should be the same.
one fuse panel on that vehicle. It's on the driver side end of dash, you have to open the driver door to get at it. The box is under the hood, labeled relay center I believe.

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1993 buick roadmaster will not blow hot air what do I need to check for how do I fix it

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Will not blow hot air when heater is on only cold air

You most likely have a blockage in the heater core. This can be blown out, although the replacement of the core is not prohibitively expensive, especially if you do it yourself. The heater core is where I would start looking, although I would only replace it if I wasn't able to flush clean water through it.

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For heater core replacing procedure. I suggest you to go through this related help links.Its all complete step by step procedure: ----How to replace heater core for All car models?

Click the link below: ---

How to Flush Heater Core?

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We have a 1992 Buick Roadmaster Sedan. We are

try to flush the heater core this should fix the problem

Feb 24, 2010 | 1992 Buick Roadmaster

2 Answers

No heat in my 1994 roadmaster wagon i replaced

If you have the Auto temp control; and you have checked the coolant level then you may need to replace the module that is under the dashboard on the right side footwell,. this is a common problem on these cars. When you remove the plastic under dash panel, look up and there is a module in the duct for the heat that determines the temp so the Climate control works correctly. I pulled mine out of a junkyard car and saved about 80 bucks.

Jan 07, 2010 | 1994 Buick Roadmaster

1 Answer

I have a coolant leak coming from the firewall passenger side from a place that looks like a hose goes to but would have no other place to connect?

You either have a heater hose leaking or your heater core is leaking....Looking for a picture for you.

Will post in a minute.

Jun 27, 2009 | 1992 Buick Roadmaster

3 Answers

1995 Buick Roadmaster - Can't get warm air from heater

Could be a problem with the auto system, could be a bad blend door, could be a clogged heater core. Are both heater hoses hot? If so, you have eliminated the heater core. If not, probably the heater core. You wil need a computer to diagnose the other 2.

Mar 18, 2009 | 1995 Buick Roadmaster

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