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My heat will not work properly

Tiny
KHIBABY23
  • MEMBER
  • 2004 MAZDA MPV
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 134,678 MILES
My problem started about 2 weeks ago, when it really started to get cold. When I turn the heat on in the car, sometimes it works, sometimes it doesn't. Some days it will start out cold and never heat up or the heat will come on for like 3 minutes and then it sarts to blow cold air. What could be the problem?
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Sunday, January 20th, 2008 AT 6:31 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hey KHIBABY23,

This problem sounds like the cooling system is low on coolant ior the temperature blend door actuator is not working. Please wait until the engine is cold and check the level, also here is a guide that will help you.

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

Please run down this guide and report back.
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Monday, March 13th, 2017 AT 1:02 PM
Tiny
GOLF11527
  • MEMBER
  • 2 POSTS
  • 2000 MAZDA MPV
  • 189,000 MILES
My 2000 mazda mpv will only throw heat from the passenger side of the car, no heat from drivers side only cool to luke warm, what could be the problem?
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Monday, March 13th, 2017 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If it has dual climate control, check the blend air doors. One could be sticking.
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Monday, March 13th, 2017 AT 1:03 PM (Merged)
Tiny
GOLF11527
  • MEMBER
  • 2 POSTS
I had this problem and had to replace the temp blend door motor cost me $121.00
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Monday, March 13th, 2017 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Check for vent doors in the HVAC system that are not opening and check to make sure the plastic duct work is still all attached under the dash.
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Monday, March 13th, 2017 AT 1:03 PM (Merged)
Tiny
PANDOTA
  • MEMBER
  • 1 POST
Did you ever get this fixed. I have the same problem
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Monday, March 13th, 2017 AT 1:03 PM (Merged)
Tiny
DA CHEVY BOI
  • MEMBER
  • 1 POST
Had heat on passenger side at first changed radiator and now no heat
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Monday, March 13th, 2017 AT 1:03 PM (Merged)
Tiny
LOVE69
  • MEMBER
  • 1 POST
  • 2005 MAZDA MPV
  • 123,000 MILES
I have heater on my front vents blow nice warm air out but my back ones blow cold air?
Thank you for your time.
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Monday, March 13th, 2017 AT 1:04 PM (Merged)
Tiny
DARKLO
  • MEMBER
  • 1 POST
  • 2001 MAZDA MPV
  • 110,432 MILES
Lukewarm heat through out van but driver side remains cold.
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Monday, March 13th, 2017 AT 1:04 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try pulling fuse HVAC inside car it may be a stuck actuator and pulling fuse for sixty seconds may reset it. See picture for testing.
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Monday, March 13th, 2017 AT 1:04 PM (Merged)

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