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Help its freezing and my heater is blowing cold air!

Tiny
BAMF69
  • MEMBER
  • 2003 MITSUBISHI LANCER
  • 4 CYL
  • FWD
  • 97,000 MILES
Hi, I turn the knob to the heat but to no luck it stay cold, I tried replacing the fuse and it was luke warm and then went back to being cold after about five minutes. Any ideas or suggestions also which symbol is it for the heater I replaced a couple and can't figure it out.
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Friday, December 17th, 2010 AT 6:08 AM

6 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
It sounds like the heater core could be plugged and needs to be flushed here is a guide to help us get started.

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.
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Friday, December 17th, 2010 AT 10:59 AM
Tiny
BAMF69
  • MEMBER
  • 13 POSTS
I already replaced the thermostat, that was what I thought at first too.
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Friday, December 17th, 2010 AT 4:21 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the heater core, if it has a heater control valve that too and the air blend door/actuator
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Friday, December 17th, 2010 AT 6:35 PM
Tiny
BAMF69
  • MEMBER
  • 13 POSTS
I found the problem, the blend door actuator for the temperature was not working, the guide helped me find it. Got a new one for $87.00 all fixed!
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Saturday, December 18th, 2010 AT 6:05 AM
Tiny
KVON8391
  • MEMBER
  • 1 POST
  • 2002 MITSUBISHI LANCER
2002 lancer heater won't work. The thermostat won't even move to the heat (red) side. It's like the vents won't open after I had my radio replaced. Help!
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Monday, March 11th, 2019 AT 11:23 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The air-mix has been installed incorrectly or restricted during the radio replacement. Recheck the installation and readjust cable if necessary.

AIR MIX DOOR CABLE CONNECTION
1. Turn the heater control assembly's temperature adjustment **** all the way to the HOT side.

2. Set the heater unit's air mix door lever to the MAX HOT position (turn the damper lever as the left illustration) and attach the cable.

3. Set the mold locator to the heater unit case and secure with a clip.
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Monday, March 11th, 2019 AT 11:23 AM (Merged)

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