The blend doors in the heater box under the dash are sticking, that's what's causing this.
Thanks for your question,
The blend doors are not allowing coolant flow, just like the old time heater control valves that used to be under the hood, except more complicated. Part of the system is getting FULL coolant though it and part isn't.
That's correct about the air, but the hot air wouldn't be there unless the coolant got there first to BLEND it all together. I don't want to argue sir, I've done hundreds of these, sorry you disagree.
Thanks again for your SUPPORT,
Your car should have independent temp controls for the right and left sides so my question is if the issue happens on the vents and floor the same on both sides.
THe heater inlet should be the lower hose. If working properly, there should be some change in the temp, how much I cannot say.
To talk this issue through, and consider the logic so we can get this figured out let me say this.
Because the issue happens on both sides and there are separate temp doors for each side, I think the issue is not electrical or a problem with the doors.
Let me ask you this, does the engine react proper operating temperature now? Have You changed the thermostat since the overheating issue?
Have you ever changed the cabin air filter?
I cannot and will not comment on death-cool, oops I mean dexcool.
I do want you to try one thing just so we can say we tried it. Take the battery cables off for a minute and then put them back on. Lets force the module to do a relearn and see what happens.
IF we are 100% sure there is proper flow to the heater core, then I fear that is what is required.
I want to explore another area, that of the heater doors. I doubt it is the issue because both are the and chances are strongly against the doors failing at the same time, but given that the heater core is the worst case and checking the doors or even one will take a few minutes, I think wee need to eliminate that.
What I suggest is take the glove box out and find the actuator (picture below). Unplug and remove the actuator. Then with the engine running and hot, turn the shaft all teh way one way and then the other to check this. As I said, for the 15 mins this will take, I think we should check it.
no picture below came thru but i think i know where it is. i will try it.
ps if i wanted to ask you another question for a different car how would i go about it? you have been very helpful and patient. i would rather stick with you if i can. the question will be about a 95 buick lesabre cusXXXXX XXXXXmited with auto heat controls that the blower is not working. i have a long list of stuff i have already tried and diag-ed
Sorry, we try this again.
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I look forward to the results.
I am very sorry, i forgot to accept your answer. please accept my apology. flushing the heater core did infact fix the problem. i am still having intermittent dexa-drool problems hopefully they will work themselves out.