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Old 10-10-2017, 02:16 PM   #1
Racer99'1.9DOHC
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Default Heater core removal

Hello everyone.
I am still in the process of tearing down my 98 SL2 and I am working on the AC/HVAC system. Iíve seen some things about moving the heater core hoses once the heater core is removed. My question is where do they go and what I need to do after I remove the core. Tried find a step-by-step but no luck or possibly missed it.
Thanks!

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Old 10-10-2017, 08:32 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Heater core removal

Are you removing the heater core and evaporator coils, including the hvac box?

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Old 10-10-2017, 10:48 PM   #3
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2001 SC2
Default Re: Heater core removal

The heater core lines are "in-line" with the cooling system, you have to loop the lines coming off the engine instead of blocking them off.
Quote:
1. Disconnect battery ground cable, then drain coolant.
2. Raise and support vehicle.
3. Move heater hose clamps upward.
4. Lower vehicle.
5. On DOHC models, remove air cleaner housing cover and air induction at intake manifold.
6. On SOHC models, remove air cleaner housing.
7. On all models, remove heater hoses at core, then blow coolant from heater core with suitable air hose.
8. Disconnect left and right center instrument panel trim panel Velcro tabs, then pull outward to unclip.
9. Remove lower heater duct attaching screws, then drop straight down and slide out sideways (Do not damage heater dust to rear floor heater duct seal)
10. Release temperature cable hold down clip from lower heater core cover by lifting upward on plastic tab while down on top of cable
11. Depress temperature valve pin, then pull temperature cable straight out.
12. Remove heater core cover attaching screws, then remove.
13. Remove lower heater core cover.
14. Remove heater core pipe clamp attaching screw.
15. Disconnect heater core electrical connector, then remove lower heater core retainer attaching screws.
16. Remove heater core.
17. Reverse procedure to install.
18. On models equipped with airbag, rearm airbag system.

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Old 10-11-2017, 06:15 AM   #4
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Default Re: Heater core removal

I plan on removing anything and everything I donít need for racing to eliminate any extra weight. Would their happen to be a video of this removal to go off of? I havenít done much work with the hvac system before. This isnít covered in the Haynes book is it?

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Old 10-11-2017, 08:58 AM   #5
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2001 SC2
Default Re: Heater core removal

IIRC the Haynes manual doesn't even cover oil changes so I'd be surprised if they covered heater core removal. The harder-to-find '91-98 Chiltons may have it, had to put something in the extra 150-200 pages over the '91-'02 Haynes that's only 120 pages (and yet with the "extra" info I still ended up tearing it to piece's and using it for kindling, was about as useful as a self-help book).

3rd gen video, 1st gen should be the same but compare with the guide I posted to be sure: https://www.youtube.com/watch?v=vCZorrWXGv4

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Old 10-11-2017, 09:41 AM   #6
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Default Re: Heater core removal

Under normal circumstances, heater core or ac evaporator coil replacement follows specific steps so parts aren't broken - facia covers, HVAC control panel, radio, etc.. Services manuals are written for careful step by step procedures. Since you're gutting the car to lighten it from excess weight, you don't need a service manual. Presuming you're removing all HVAC parts from the engine bay and interior and removing the radio, the one or two HVAC hoses and heater core hoses are simply disconnected by the firewall. The heater hoses are joined together with an inline coupler inserted into each hose end and clamped so the cooling system bypasses the heater core. Gutting the interior is simply a matter of removing panels, screws and clamps to remove part or all of the HVAC box, evaporator coil and heater core. The hvac control panel, presumed no longer needed, is disconnected and control cables removed, electrical connections to the blower are disconnected, blower motor left in place or removed. Gutting the interior and not reusing parts makes this easier, not worrying about breaking parts not used anymore unless you're selling them.

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Old 10-11-2017, 12:21 PM   #7
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Default Re: Heater core removal

So itís as simple as connecting the two hoses that go into the firewall together so it keeps circulating? Any other hoses I should worry about or look for or does everything else just come out?

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Old 10-11-2017, 05:09 PM   #8
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Default Re: Heater core removal

Yes, as posted previously, disconnecting both heater hoses from the firewall simply needs a metal tube or barbed connector to fit the inside diameter of the hoses, press each hose end onto the metal coupler and two hose clamps. The entire heating system is bypassed with coolant circulating back to the coolant container and cooling system. No more heater function. The same for the a/c system. Gut the entire a/c system from the engine bay and disconnect the ac fitting(s) on the same firewall area as the two heater hose connections except the ac hoses/fittings connect to the thermal expansion valve directly. You can either leave the txv there or remove it to allow removal of the evaporator core inside the car. The heater hoses are the only hoses that must be joined together. Below are two examples. One from plumbing supply, the other may be plumbing or auto parts.

The heater hoses being connected and the starting circuit wiring mod are the only two thing I can think of that are required. Everything else is simply removed.
Attached Images
File Type: jpg download.jpg (5.2 KB, 0 views)
File Type: jpg fittings.jpg (88.5 KB, 0 views)

Last edited by fdryer; 10-11-2017 at 05:21 PM..

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Old 10-11-2017, 07:26 PM   #9
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Default Re: Heater core removal

Appreciate all the help fdryer. One last thing, how much coolant (water) should I drain out before removing these hoses? Better to go ahead and drain it all?

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Old 10-11-2017, 08:49 PM   #10
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Default Re: Heater core removal

Yes, drain as much as possible and if you're reusing coolant, filter it before putting it back in. The highest point of the cooling system (car on a level surface) is the coolant surge tank, designed to allow automatic purging of air in the system. To lose as little coolant as possible, use the radiator petcock to drain the radiator and engine before disconnecting the heater hoses. what drains out heater hoses will be coolant in both hoses and heater core.

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Old 11-14-2017, 12:27 PM   #11
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Default Re: Heater core removal

Hey guys!
Itís an older post and a little late to get back on here but the heater core was removed successfully! Went to advance auto parts and they had the exact fitting for the hoses (3/4Ē ID to 5/8Ē ID). Just had to cut the hoses a little bit to get it straight but fit perfectly and no leaks! Thanks again!

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