HEATER CORE

Tiny
SS193329
  • 1998 CHEVROLET LUMINA

Heater problem 6 cyl Two Wheel Drive Automatic

HOW TO INSTALL A HEATER CORE?

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Wednesday, December 2nd, 2009 AT 1:06 PM

15 Replies

Tiny
2CARPROS KEN
  • ADMIN
  • 12,124 POSTS

Hello,

You must start by letting the charge out of the air conditioner.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

then get started under the dash removing the heater box along with the heater and ac hoses.

Here is a guide hat will show you what you are in for when doing the job.

https://www.2carpros.com/articles/replace-heater-core

Your car will be a little different but you get the idea.

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

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Monday, May 22nd, 2017 AT 1:52 PM
Tiny
ALSMITH872
  • 1998 CHEVROLET LUMINA

Engine Cooling problem
1998 Chevy Lumina 6 cyl Front Wheel Drive Automatic 188020 miles

I have a water leak on the hose or tube going through the firewall going to the heater core I assume this is the hose going to the heater core. The hose is in the middle of the firewall under the intake manifold. My question is, is this the hose going to the heater core? Also I can smell antifreeze coming out the heater vents. I also have a wet spot in the car floor under the heater core but I can not see the water leaking in the car, it leaks out side at the fire wall hose a lot. So can you tell me what that hosa is and do you think I need to replace the heater core? Thank you for your time.

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,496 POSTS

Hi:
Yes that is the heater core. If you are getting coolant in the car, it is leaking inside too. If you smell coolant through the heater vents, that is the problem. It will need replaced.

Let me know if you have other questions.

Joe

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
BBICKERS
  • 1992 CHEVROLET LUMINA

Heater problem
1992 Chevy Lumina 6 cyl Two Wheel Drive Automatic 94000 miles

how do I replace the heater core myself?

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
  • 16,912 POSTS

Is this the Lumina Van or Lumina Sedan?

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
SLYCAT422
  • 1995 CHEVROLET LUMINA

Shakes or Wobbles problem
1995 Chevy Lumina 6 cyl Front Wheel Drive Automatic 110000 miles

Hi. I replaced & correctly installed a new Waterpump & Thermostat. Checked "All 3 Relays", Fuses, checked heater control switch for fluctuating resistance w/ meter while turning knob back & 4th. It checked out ok. I flushed system 4-6 times, filled full "WATER". There's NO OBSTRUCTIONS in cooling system, yet only cold air comes out of heater core. I removed Kickpanel & Core Shroud. If the problem IS in The Heater Cont. Valve, where exactly is it located, & or what else could it be except it? Please let me know ASAP I need to get some antifreeze in it before block freezes up. Thanks Scott S. - Kennewick, WA. 99336

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
RENAUDTN
  • MEMBER

I can't remember if your car has a heater control valve but if it does it should be in the heater core inlet hose. Also, your heater core could be plugged. When your car is idling at normal operating temp and the heat is turned on all the way, are both heater core hoses really hot? If so your core is fine; if one is cooler than the other, your heater core is clogged.
Another possibility is your vent door or your vent door actuator. When you switch from cold to hot do you hear the vent door moving behind the dash? If not look there.

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
LGOODLYW
  • 1999 CHEVROLET LUMINA

Heater problem
1999 Chevy Lumina 6 cyl Two Wheel Drive Automatic 99902 miles

how to replace heater core 1999 chevy lumina

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,496 POSTS

Hi:
Replacing the heater core is an involved process which requires removing part of the dashboard. I recommend purchasing a repair manual (Haynes, Mitchell, Chiltor) before starting. The manual will provide step by step instructions and pictures for part identification.

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Monday, May 22nd, 2017 AT 1:53 PM (Merged)
Tiny
KATERI
  • 1995 CHEVROLET LUMINA

Heater problem
1995 Chevy Lumina 6 cyl Front Wheel Drive Automatic 235000 miles

I've been having issues with my heating. I did a flush and changed my thermostat but my heat is not as hot as it should be and my rear heating is not working. Could my rear heater core be the problem?

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Monday, May 22nd, 2017 AT 1:54 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,496 POSTS

With the engine running, rear heat on high, and the engine at normal operating temp, feel both heater core hoses. THey both should be hot. If one is cold, there is no circulation to the heater core, thus no heat.

Let me know what you find.

Joe

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Monday, May 22nd, 2017 AT 1:54 PM (Merged)
Tiny
LGOODLYW
  • 1999 CHEVROLET LUMINA

Heater problem
1999 Chevy Lumina 6 cyl Front Wheel Drive Automatic 99970 miles

how much trouble to change the heater core. Thank you, when I get back to work I will make a dontation.

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Monday, May 22nd, 2017 AT 1:54 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
  • 18,982 POSTS

Not much on your car. Remove hoses the sound panels on pass side. Then floor duct to rear then cover to core. Then remove core.
At bottom of reply you can get manual via internet click on bottom site ie. Manuals.

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Monday, May 22nd, 2017 AT 1:54 PM (Merged)
Tiny
RORYTHUNE
  • 1995 CHEVROLET LUMINA

Heater problem
1995 Chevy Lumina 6 cyl Front Wheel Drive Automatic

I have a 1995 lumina and the heater doesnt work. I replaced the thermostat and that didnt fix my problem. The car also overheats and it blows cold air into the cab. Once and great while I get a smell of antifreeze. What could it be im kind of thinking the heater core but not to sure

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Monday, May 22nd, 2017 AT 1:54 PM (Merged)
Tiny
RENAUDTN
  • MEMBER

One way to find out if it's your heater core, is to leave the car idling at normal operating temp, and turn the heat on high; if both heater hoses are burning hot, your heater is probably fine (although it could be leaky which could explain the smell); if one of the hoses is cold or luke warm, your heater core is probably clogged. If there's a heater control valve in your system, make sure it's not stuck closed (the inlet hose will be hot up until the valve, and cold after the valve).

From what you're describing, it sounds like you need to flush your cooling system/heater core, and you may even have to replace the core depending if it's leaking or not. Again, if you have a heater control valve, make sure it's not the culprit. I can't remember if you have one or not.

Good luck

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Monday, May 22nd, 2017 AT 1:54 PM (Merged)

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