4.3

2000 GMC Sonoma

Tiny

skipel23

November, 19, 2010 AT 10:32 PM

Enter your question.I DON'T HAVE ANY HEAT, I replaced the therm. And all. Switches seem to be working. There dosen't seem to be any water circulating thru heater core. The engin isn't overheating. Could this still be the water pump.

FOUND 3446 RELATED QUESTIONS

12 Answers

Tiny

BMRFIXIT

November, 19, 2010 AT 11:04 PM

Does it run at operating temp?
Run engine and check heater hoses by the fire wall if both hot and no hot air inside
problem is in the heater box and blend door or blend door actuator

Tiny

rasmataz

November, 19, 2010 AT 11:11 PM

Also check if it has a heater control valve

Tiny

skipel23

November, 20, 2010 AT 7:33 PM

The engin runs at operating temp. The inlet hose gets warm, but not hot and the exit hose stays cool. It is like there isn't enought pressure in the line. Does the blend box stop the flow of the water.

Tiny

BMRFIXIT

November, 20, 2010 AT 7:48 PM

They do not use a valve in this system and blend system was used
as they direct the air thro and over the heater core and or the AC system and fresh air

heater core need to be isolated and flushed

Tiny

skipel23

November, 20, 2010 AT 7:59 PM

I did that and water runs thru it freely.

Tiny

BMRFIXIT

November, 20, 2010 AT 8:03 PM

If water running thru freely and no heat on the inside, engine reaching operating temp,
check blend door operation and I would suspect the actuator on the door

Tiny

skipel23

November, 20, 2010 AT 8:11 PM

When I say water is rinning freely, It is with the hoses disconnected. How do I get to the actuator.

Tiny

BMRFIXIT

November, 20, 2010 AT 8:13 PM

Under the dash on the heater box
i will try to find a picture for you

Tiny

skipel23

November, 20, 2010 AT 8:16 PM

Thanks

Tiny

BMRFIXIT

November, 20, 2010 AT 8:17 PM

This a picture of the part and what it look like
let me know

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