1995 Mazda Protege Temp guage goes up at and heater temp ge

Tiny
TVH2CARPROS
  • MEMBER
  • 1995 MAZDA PROTEGE
  • 4 CYL
  • FWD
  • MANUAL
  • 83,600 MILES
The temp guage goes up and the heater temp get hotter only at idle. When I drive it the temp guage goes down all the way and the heater temp goes down. I put in a new thermostat. It doesn't appear to be losing any coolant. Please help. Is it the heater core?
Thursday, December 3rd, 2009 AT 10:33 PM

5 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Check to see that your cooling fan(s) come on properly. Let me know if they are working.
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Thursday, December 3rd, 2009 AT 10:40 PM
Tiny
TVH2CARPROS
  • MEMBER
  • 2 POSTS
Do you mean to make sure the cooling fan is on at idle? Actually I think the thermostat was bad or it has a problem with the install. It has to be the thermostat. It acts like the coolant is continually flowing.
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Thursday, December 3rd, 2009 AT 10:53 PM
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
They come on when engine reaches certain temperature. Not always at idle, you can hear them kick in while driving as well.
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Friday, December 4th, 2009 AT 6:58 PM
Tiny
RAINALLDAY
  • MEMBER
  • 5 POSTS
I have the exact same problem, did you find a solution yet?
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Saturday, January 2nd, 2010 AT 12:31 AM
Tiny
RAINALLDAY
  • MEMBER
  • 5 POSTS
I have the exact same problem, heats at idle, no heat when moving.
I'm thinking its a clogged heater core.
I see that getting to the heater core is alot of work.
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Friday, January 8th, 2010 AT 1:35 PM

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