Very little heat

GEORGE RHODES

MEMBER
2000 GMC SONOMA
4.3L
6 CYL
4WD
AUTOMATIC
103,000 MILES

I replaced heater core last year. Had good heat. This year has lukewarm heat.I checked heater core hoses one is hot the other is warm. New thermostat last year also. Antifreeze is full. Thanks

Thursday, September 17th, 2020 AT 4:17 AM

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

Sounds like some dirt or debris got into the heater core.

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

I would remove the hoses from the core and use a garden hose to flush the core back and forth several times until you get a clear even flow from both sides.

https://www.2carpros.com/articles/replace-heater-hoses

Also, make sure the coolant level is good as well.

https://www.2carpros.com/articles/radiator-pressure-test

Roy

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Thursday, September 17th, 2020 AT 4:50 AM

GEORGE RHODES

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21 POSTS

Thank you, I'll try it.

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Thursday, September 17th, 2020 AT 4:54 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

You are welcome.

Always glad to help.

Roy

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Thursday, September 17th, 2020 AT 5:02 AM

GEORGE RHODES

MEMBER
21 POSTS

Hello ACEMASTER6371.I flushed heater core. And replaced thermostat. Heater core was a little dirty. Thermostat housing was right there and easy to get to where I disconnect heater hoses. So I replaced thermostat also.I have great heat. Thank you. Have a Blessed Day!

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Thursday, September 17th, 2020 AT 11:16 AM

ASEMASTER6371