Maximum heater temperature too low

Tiny
CNYGERMANY
  • MEMBER
  • 1996 CHRYSLER NEW YORKER
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
Hello,

my HVAC is working fine so far but the maximum heater temperature is too low. Depending on the outdoor temperature the heater gives not more than approximately 15° Celsius. Temperature control works fine from hot to cold and reverse, A/C works too.

Ran the auto diagnostic procedure as explained here by KHLOW2008. Error code is 34 - Engine Temperature Message Not Received.

How to proceed?

Thanks!
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Sunday, May 9th, 2021 AT 2:28 AM

3 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

This sounds like it could be a thermostat stuck open not allowing the engine to heat up to the proper temperature. That will give you reduced heat from the system.

The other possibility is the heater core. It may be clogged with debris. You would need to remove both hoses from the firewall and use a garden hose to flush the core back and forth. Then hook the hoses back up and fill the coolant and retest.

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

The intake manifold needs to be removed to access the thermostat. I attached the procedure for you below.

https://www.2carpros.com/articles/replace-intake-manifold-gasket

Roy
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Sunday, May 9th, 2021 AT 8:06 AM
Tiny
CNYGERMANY
  • MEMBER
Thank you for your suggestions! Thermostat is right, engine temperature is proper. Checked it using OBDII diagnostic device. Next step seems to be flushing the core as you suggested. I will report. Regards!
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Tuesday, May 11th, 2021 AT 1:13 AM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome.

Always glad to help.

Roy
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Tuesday, May 11th, 2021 AT 3:10 AM

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