Heat not working

K

kane2o13

Member

:

2003 Mazdaspeed Protege

• Sep 20, 2014

• #1

Ok so my heart isn't working on my 03 msp and was wondering if there are common problems to look for. I plan on trying to fix it today so any advice would help a lot

 

P

Preferio

I break stuff.

Contributor

:

2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6

• Sep 20, 2014

• #2

kane2o13 said:

Ok so my heart isn't working on my 03 msp and was wondering if there are common problems to look for. I plan on trying to fix it today so any advice would help a lot

Click to expand...

Does the car take an excessive length of time to reach operating temperature?

Does the temperature control knob still have resistance when turning, or does it move freely?

Are both the inlet and outlet hoses on the heater core hot?

 

K

kane2o13

Member

:

2003 Mazdaspeed Protege

• Sep 22, 2014

• #3

The Knob has a good amount of resistance when trying to turn to heat

 

K

kane2o13

Member

:

2003 Mazdaspeed Protege

• Sep 22, 2014

• #4

And no takes normal time to warm up and don't know bout hoses

 

P

Preferio

I break stuff.

Contributor

:

2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6

• Sep 22, 2014

• #5

Get the car up to operating temperature and see if both the hoses going into the firewall are hot and relatively the same temperature. If one is hot and the other is cold, that means you don't have flow across your heater core.


Though it's unlikely, remove the glovebox, and make sure that your temperature control cable is still attached to the blend door.

 

P

Preferio

I break stuff.

Contributor

:

2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6

• Sep 22, 2014

• #6

There are really only 3 possibilities- failed thermostat (stuck open), disconnected/broken/inop blend door/hvac cable, or restricted heater core.

 

G

gmck

Member

:

Black Mica 02 P5

• Oct 23, 2014

• #7

Preferio said:

Does the car take an excessive length of time to reach operating temperature?

Does the temperature control knob still have resistance when turning, or does it move freely?

Are both the inlet and outlet hoses on the heater core hot?

Click to expand...

My heat also does not work and my temperature dial is stiff just as you said. How do I fix this? Also my A/C light only comes on for fan speed settings 1 and 4.

 

H

hornsfan10609

Certified Mazda Tech

:

2003.5 Mazdaspeed Protege x2

• Oct 24, 2014

• #8

You need a new fan switch for the a/c, and the wiring/connector may be damaged. It may work for a while if you repair the connector on the back.