No heat

Tiny
HAWAII
  • MEMBER
  • 2003 CHEVROLET IMPALA
The blower works but no heat. I can hear a water in the dash if I rock the car or go over a bump. I replaced the water pump 6 monthes ago.
Monday, November 26th, 2007 AT 9:18 AM

21 Replies

Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
You have air in the cooling system.remove a heater hose and fill the system,then reconnect the heater hose.this should purge the air from the system.

This guide will help you fix it

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

Please run down this guide and report back.

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Monday, October 29th, 2018 AT 11:33 AM
Tiny
LNR7477
  • MEMBER
  • 0 POST
I had to flash the heater core to make my heater start working again FYI thanks for the guide
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Monday, January 13th, 2020 AT 6:51 PM
Tiny
JENBIG99
  • MEMBER
  • 2 POSTS
  • 2003 CHEVROLET IMPALA
Heater problem
2003 Chevy Impala V8 Wheel Drive Type unknown Automatic 101200 miles

Heater and defrost is not working
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Heater and defrost is not working

Do you hear the blower motor running?-If not try direct power to the motor-if it works-find the blower motor resistor and test it.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
JENBIG99
  • MEMBER
  • 2 POSTS
The blower is working, it is blowing out cold air for both the heat and A/C.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Replace the thermostat and also check heater hose/heater core for clogging
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
DANAJEAN
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 45,000 MILES
When I have the heat on it's only hot on drivers side and cold on passenger side. During the summer if I had the air on it would blow cold air on driver side and hot air out on passenger side. Any ideas what is causing this?
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
RENAUDTN
  • MECHANIC
  • 636 POSTS
Your temp actuator may be bad.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Pull your havc fues and put it back in after 30 secs. Turn the key on and let it rest the actuator positions. See if that works
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
MZWEST
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET IMPALA
Heater problem
2003 Chevy Impala 6 cyl 112000 miles

My Heat in my car is not working it only blows out cold air whats wrong
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
RENAUDTN
  • MECHANIC
  • 636 POSTS
It could be one of the following:

*Thermostat stuck open
*clogged heater core
*defective control valve
*low coolant
*problem w/ actuator

It could also be a vacuum leak.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
AUSTINCR
  • MEMBER
  • 6 POSTS
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
The heater for the drivers seat stopped working sometime during the summer.
Passenger side works fine. Both worked last spring.
I have 12 volts to the switch and the switchis ok.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Most likely it is the heater element it self that went bad
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
DSTEEN10975
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 85,518 MILES
My car had been running for approximately 15 mins and was producing heat. There was a strange smell and the blower started blowing cool air. The next day it was blowing warm air but not hot air still with a strange smell. What can it be?
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,788 POSTS
Hi:
It sounds like a problem with the heater core. If may be leaking coolant and that is what you smell. Check the carpet on the passanger side to see if it is at all wet.

Let me know what you find.

Joe
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
DANAJEAN615
  • MEMBER
  • 3 POSTS
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 67,000 MILES
When I go to put air on it only blows cold on drivers side and blows hot on the passenger side. It takes a few days then it starts working properly. Then reverse when I turn heat on it blows hot on driver side and cold on passenger side. After a few days it starts working properly. Any ideas what would cause this?
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
One of the "blend doors" in the heater control module is malfunctioning.

Depending on if you have a vacuum or electronically controlled blend door will determine the repair procedure. If you are handy with a wrench, then purchase a subscription from "All Data" or "Mitchell". They only cost $25.00.

This will give you all of the repair data you need. And it will also come in handy when you encounter other problems, which all vehicles do eventually.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
SONNYSCH123
  • MEMBER
  • 2 POSTS
Where is "blend doors" in the heater control module?
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

Procedure below and picture attached. You can get these at any parts store.

Roy

REMOVAL PROCEDURE
1. Remove the right side instrument panel (IP) insulator.
2. Remove the IP compartment.

ImageZoom/Print

3. Disconnect the electrical connector from the right air temperature actuator.

ImageZoom/Print

4. Remove the screws retaining the right air temperature actuator.
5. Remove the right air temperature actuator.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2003 CHEVROLET IMPALA
  • 65,000 MILES
I just noticed today that we could not get any hot air even though the water temperature was quite hot. We live in Wisconsin and the outside temperature was around 20 degrees. We have owned the car for 8 years and this is the first time this has happened.
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Monday, January 13th, 2020 AT 6:52 PM (Merged)

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