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Don 'Mo Lurch'
Don 'Mo Lurch', Pontiac Mechanic
Category: Pontiac
Satisfied Customers: 18576
Experience:  GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
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Is removing the heater core for 2005 Pontiac Grand Prix just

Customer Question

Is removing the heater core for 2005 Pontiac Grand Prix just as extensive as the 2004 model?
Submitted: 4 years ago.
Category: Pontiac
Expert:  Don 'Mo Lurch' replied 4 years ago.

It is the same, as the Heater Case has to be removed to open & remove the Heater Core.
Be sure to feel "both" Heater Hoses at the Firewall, with Engine at operating Temperature & Heater on High Heat, & see if they both feel equal.
If so & the both are hot, then it could be the Air Door, Air Door Actuator or Mode Valve, all located at the Heater Case, behind the dash

Here is repair on air temperature actuator

 

click below

\

AIR ACTUATOR

 

 

Customer: replied 4 years ago.
Could you give me an estimate of what I should expect to pay to have that Actuator diagnosed and replaced? According to the 2004 instructions on the heater core removal it involved removing the front seats..would that be the case with this actuator?
Expert:  Don 'Mo Lurch' replied 4 years ago.

 

Labor calls for apprx 3.5 hours

 

Here is what Book shows

 

graphic

 

 

Customer: replied 4 years ago.

Is it worth trying to replace the Thermostat to make sure that is not affecting it?

I am definitely not over-heating but it does take some time for the engine to warm up to normal temp on cold mornings. IS there any fuse that could affect this as well that I could replace?

Expert:  Don 'Mo Lurch' replied 4 years ago.

 

Prior to replacing Thermostat, you may want to have the Temperature checked at Engine Operating Temperature.
Also, checking ther Heater Hoses for equal Temperature.
The Actuators are powered & controlled thru the Control Module

 

graphic

Don 'Mo Lurch', Pontiac Mechanic
Category: Pontiac
Satisfied Customers: 18576
Experience: GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
Don 'Mo Lurch' and 6 other Pontiac Specialists are ready to help you
Customer: replied 4 years ago.

Well I ended up flushing the heater core and my heat is back in full force.

Thanks for all the info.

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    Don 'Mo Lurch'

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Don 'Mo Lurch'
Don 'Mo Lurch'
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GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.