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Ask Reggie Whiddon Your Own Question
Reggie Whiddon
Reggie Whiddon,
Category: Chevy
Satisfied Customers: 110
Experience:  Lead tech at river regions auto
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I have a 2005 Chevy venture 3400 engine. My heater

Customer Question

hi i have a 2005 Chevy venture 3400 engine. My heater wasn't getting hot . so I replaced the heater core. And Its still not getting hot can you help?
Submitted: 9 months ago.
Category: Chevy
Expert:  Gary replied 9 months ago.

with it running and warmed up when you turn from hot to cold do you feel any temp difference at all ?

Customer: replied 9 months ago.
just a little, then it immediately goes back too cold.
Expert:  Gary replied 9 months ago.

with the engine hot if you feel both heater hoses at the fire wall are both very hot ?

Customer: replied 9 months ago.
The one on the top is cold. The one on the bottom is hot.
Expert:  Gary replied 9 months ago.

how old is the thermostat in this engine ?

Customer: replied 9 months ago.
The thermostat is new replace it about 3 months ago.
Expert:  Gary replied 9 months ago.

this either is low on coolant or the thermostat is opening way too early or the temp door electric actuator is not operating the temp door to full hot

Customer: replied 9 months ago.
I filled it up with coolant, The hose going from the radiator to the thermostat housing is extremely hot. I looked under the dash the actuator throttle is moving. The hose coming from the engine to the heater core is hot the hose coming out of the heater core to the thermostat is cold or barely warm.
Expert:  Gary replied 9 months ago.

you see the temp actuator moving to hot then cold when you turn the temp setting ?

Customer: replied 9 months ago.
Expert:  Reggie Whiddon replied 9 months ago.

Hi in reggie if I'm understanding you one of your heater core hoses is hot the other is cold? Have you disconnected the cold hose while running to see if you have any flow? I like to keep some clear hose handy for a problem like this I'll take the inlet and outlet hose and replace then with clear that way I can observe while running

Expert:  Reggie Whiddon replied 9 months ago.

hello sir have you checked this

Customer: replied 9 months ago.
Oh, not yet I will check it today, and get back with you.
Expert:  Reggie Whiddon replied 9 months ago.

Thank you