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Heater core replacement

Tiny
CEDDY2_
  • MEMBER
  • 2008 JEEP LIBERTY
  • 80,000 MILES
Hello, I am working on the vehicle listed above it is a 3.7 liter. The issue I am having is no heat. The blower motor is working fine, the blend doors are moving, the engine temperature is at normal temperature range. I checked the inlet and outlet hoses on heater core. The inlet is very hot, the outlet is a lot cooler than inlet so my assumption is the heater core is clogged. I blew air through the core and it got a little better heat, but not good heat. Now what I need from the pros; I have looked everywhere for a how to manual for this job, do I need to pull the whole dash or is the core easy to get to? Do I need to pull the whole heater box for this job and can you send me some information on how to get this job done? I can do it I just need a starting point. Lol
Thanks
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Thursday, October 17th, 2013 AT 5:11 AM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Hello,

You must start by disconnecting the battery and draining the coolant. Next you must vacuum doan and recharge the air condition system. Here is a guide to help you see what I am talking about,

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

This next guide will give you an idea of what you are in for when doing the job.

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

Here are diagrams to show you how to do the job on your car (below)

Check out the diagrams (Below)

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

Cheers
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Thursday, October 17th, 2013 AT 6:13 AM
Tiny
CEDDY2_
  • MEMBER
  • 21 POSTS
Where is the location of this fuse and what actuators am I trying to reset? Thank you.
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Thursday, October 17th, 2013 AT 2:20 PM
Tiny
CEDDY2_
  • MEMBER
  • 21 POSTS
Okay I got it scanned, and received no codes. I checked the blend door actuator and it is working fine, I am getting lukewarm air on both sides of the car. Can you send information on heater core removal please? Thank you.
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Thursday, October 17th, 2013 AT 2:57 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
A couple of things you should to check before removing the heater core because you have to remove the dash first. If the actuators are working check to make sure the vents actually move and are not broken. Also, the hose that is cold attach a water line to that and disconnect the hot hose and put into a suitable container, blow the heater core out with water not air as this will flush it out, then try and see if it gives heat. Also, check for air in system as you could have an air lock in it.

Please let us know what happens
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Thursday, October 17th, 2013 AT 4:07 PM

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