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2009 thermostate thermostat. Cts. Bot

2009 thermostate thermostat Mechanic's...

2009 thermostate thermostat

Mechanic's Assistant: What is the model of your '09 Cadillac?

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Mechanic's Assistant: Are you fixing your CTS yourself? What have you tried so far?

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1/19/2018
Gm Tech (Cam)
Gm Tech (Cam), Cadillac Mechanic
Category: Cadillac
Satisfied Customers: 29,830
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified

Hello there, I am Cam.

I am Licensed technician at a GM dealership with more than 16 years experience. 
Like you, I am a user of this website and as such, any billing questions should be sent to customer service.

I ask that you please provide details and communicate with me so we can make your experience here worth 5 stars! I am around most days but not every minute of every day. If you reply while I am offline, I will respond when I am next online.

Good morning, what question can I answer about your thermostat?

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Customer reply replied 29 days ago
Howdy, I have a 2009 Cadillac CTS - not the V. GM 3.6l. It's starting to blow lukewarm air. I'm assuming this is the thermostat. Seem likely?

No, usually if the thermostat was to be opening soon you would get a check engine light with a code P0128.
"
Blowing luke warm usually is a flow issue through the thermostat, low coolant condition or the heater door/actuator that changes the temperature has failed or is failing.

you can tell for sure by checking the temperature of the heater hoses. One should be hot, the other only warm. IF both hot then you have a coating inside the heater core that needs a coolant flush to fix. If the temperature is good on the hoses then its a heater door issue.

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Customer reply replied 29 days ago
OK! I will check collant level.
Heater door is something a reasonably competent mechanic can do? My understanding is that if it was a thermostat issue it would be throwing a diagnostic code and it's not so that's most likely not the issue, correct?
It does seem if I'm not getting much air flow from the heater vents that face forward and the air flow through the vent by my knees seems lukewarm - not hot.

Minimal air flow could be the result of a plugged cabin air filter. That you can change, it is located under the air inlet grill (under the wiper blade area).
The temperature door actuator, one thing to remember is that if that is the issue, it would affect only the one side. So with that, is the passengers side also not hot?

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Customer reply replied 29 days ago
I have not checked the cabin air filter in a very long time. I can check that. I rarely have anyone else in the car and often don't use the passenger side but it seemed to me that when I checked it, it also was not getting hot. To provide a bit more information, I live in Wisconsin where it is very cold. I generally "Crank" the heat up to 85 and then modulate it down when it gets too hot. The other day I noticed it never was getting "hot" in the cabin - just luke-warm. Getting very little to no air flow out of the dash vents which seemed odd but with my control panel I wasn't clear when air should flow out of those vents and when it should come out of the floor vent by my knees.

Understood. So check/change the cabin air filter,
Verify the passengers side reacts the same, and if so then flush your heater core. To do that, take the heater hoses off then use a pressure washer (lower pressure setting) or garden hose inside the ports that the hoses went onto. Flush into both ends to dislodge and flush out any debris, then try it again.

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Customer reply replied 29 days ago
Thank you very much! I think that's a good start. How do I conclude this?

You would select a rating and it is closed. That would not prevent you from replying after the fact should you have follow up questions.

Gm Tech (Cam)
Gm Tech (Cam), Cadillac Mechanic
Category: Cadillac
Satisfied Customers: 29,830
Experience: GM Grand Master Technician 2007. 14 years experience.
Verified
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Gm Tech (Cam)
Gm Tech (Cam)
Gm Tech (Cam), Cadillac Mechanic
Category: Cadillac
Satisfied Customers: 29,830
29,830 Satisfied Customers
Experience: GM Grand Master Technician 2007. 14 years experience.

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