Help its freezing and my heater is blowing cold air!

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.

Friday, December 17th, 2010 AT 6:08 AM

6 Replies

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.

Was this

answer

helpful?

Yes

Friday, December 17th, 2010 AT 10:59 AM

BAMF69

MEMBER
13 POSTS

I already replaced the thermostat, that was what I thought at first too.

Was this

answer

helpful?

Yes

-1

Friday, December 17th, 2010 AT 4:21 PM

RASMATAZ

MECHANIC
75,992 POSTS

Check the heater core, if it has a heater control valve that too and the air blend door/actuator

Was this

answer

helpful?

Yes

Friday, December 17th, 2010 AT 6:35 PM

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!

Was this

answer

helpful?

Yes

Saturday, December 18th, 2010 AT 6:05 AM

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!

Was this

answer

helpful?

Yes

Monday, March 11th, 2019 AT 11:23 AM (Merged)

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.

Image (Click to make bigger)