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No heat

Tiny
JIM HOLLORAN
  • MEMBER
  • 1998 PLYMOUTH BREEZE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Heat is lukewarm. New thermostat. At operating temperature one heater hose is warm and the other slightly cooler. Where is the heater valve located on the vehicle listed above 2.4 engine? Thanks
Monday, December 9th, 2019 AT 11:01 AM

7 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like you could have a bad thermostat right out of the box, or you may have been sold the wrong thermostat. This wouldn't be the first or last time a thermostat was bad right out of the box. In the diagrams down below I have included the Original Equipment Manufacturer [OEM] part number and the specs for the thermostat for your vehicle. Please go through these guides and get back to us with what you find out.

Thanks,
Alex
2CarPros
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Tuesday, December 10th, 2019 AT 8:08 PM
Tiny
JIM HOLLORAN
  • MEMBER
  • 4 POSTS
I checked the stat seems okay. If the stat was bad I wouldn’t heat through the radiator feed hose. When the stat opens the hose is very hot also does this engine have a heater control valve and if so where is it located thanks for any help Jim Holloran.
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Wednesday, December 11th, 2019 AT 7:46 AM
Tiny
SCGRANTURISMO
  • MECHANIC
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Hello,

No it doesn't have a heater control valve. This is accomplished with the blend door operation. Another thing that you might want to look at is if there is an air pocket in your vehicle's cooling system this would keep your vehicle's coolant from circulating properly and could cause poor heater performance.

Thanks,
Alex
2CarPros
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Wednesday, December 11th, 2019 AT 7:57 AM
Tiny
JIM HOLLORAN
  • MEMBER
  • 4 POSTS
If the blend door wasn’t opening all the way would that cause the heat to be Lukewarm? I checked the thermostat seems okay. If the thermostat was bad I wouldn’t get heat in the feed hose to the radiator it’s very hot when the thermostat opens. Is there a heater control valve with this engine?Thanks for any help.
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Wednesday, December 11th, 2019 AT 8:05 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Okay, In the diagrams down below I have included a guide from the vehicle manufacturer on symptom and diagnosis of your vehicle's cooling system. Please go through this guide and get back to us with what you find out.

Thanks,
Alex
2CarPros
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Wednesday, December 11th, 2019 AT 12:49 PM
Tiny
JIM HOLLORAN
  • MEMBER
  • 4 POSTS
I tried to flush the heater core the best I could when I take the car on the highway the temperature gauge drops to cold and the heat is very cold when I get into city traffic the temp gauge goes up 3 no he’s the heat is Luke warm do you think the thermostat is the problem I replaced the old one but still have the problem could it be defective even though it was new out of the box thanks Jim h
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Monday, December 16th, 2019 AT 10:36 AM
Tiny
SCGRANTURISMO
  • MECHANIC
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Hello again,

I would say yes. This wouldn't be the first or unfortunately the last time a part was bad right out of the box, and all the signs point to a stuck open thermostat.

Thanks,
Alex
2CarPros
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Monday, December 16th, 2019 AT 3:44 PM

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