At the perfect time of year, my 99 Regal LS started something naughty this
It was around 50 degrees this morning and I set it at auto for 73 degrees.
about 5 minutes I noticed it wasn't getting warmer. I noticed it was set for 3
out of 6 to the Floor so I bent down and felt cold air coming out (unwarmed).
"That's not right." I then manually set it for 90 degrees to the floor at full
and it was putting out cold air.
Later today, I did some testing and found this. If I turn off the system for
minutes, then go back to auto or manual mode, warm air will come out for about
seconds (it seems longer if the system has been off for longer, like it's
or something) and then it turns cooler or cold again (not conditioned).
Does anybody have an idea as to what part(s) is/are going? Hopefully it's
quick and inexpensive.. :)
Thank you for your help!
First question is does your Temperature display flash? If so, take the car
to a dealer and they can retrieve the codes that will tell you what is
Second thing is does it ever blow out hot air? Perhaps your thermostat is
Third thing is what happened to my '96 Bonneville, though opposite (I get
cold air that switches to hot very fast). It turns out that there is a
little door down behind the dash (over the heater core) that switches around
depending on whether you want cold air or hot. There is a small motor and
small rod connected to this little door and your climate control tells the
door to open or close depending on if you want cold or hot. If the door is
not closing or opening properly then you will get hot or cold air or perhaps
Anyhow, check to see if the Temperature display flashes first and make sure
you're car does warm up. That is a good start.
Be aware that the Buick computer that controls these functions may be
and it an expensive part.. Runs in the neighborhood of $600 to replace,
It is not a part that you replace HOPING that it might cure the problem.
If you take the car to a dealership, be sure you discuss your problems,
Actually, I was not talking about the computer, I was meaning the rods and
what not under the dash. Quite often they come loose or fall off thus giving
you no heat, or no cold, or a combination of the two. Now, to fix the
problem is quite the task, but it usually does not require parts, depending
on what is wrong.
Yes, I am aware of that, and understand how the system works. My comments
were meant in addition to yours, not to supplant them.
If your vacuum system is not working properly, that mechanical system will
work either. But working with all that little crap under the dash can be a
The temperature display does not flash, even though it has been very
light for a year or so now, but I've learned to live with it as the
whole climate 'thing' would have to be replaced for a lot of money and
a lot of time direct with GM.
It does blow out hot air. Per below, if I wait about 5 minutes with
the system off, then put it back to 90 degrees, it puts out hot air for
about 20 seconds, then it turns cool again.
I'll have to take it to a dealership.
80 Knight wrote:
Hmm, if you mean the climate control center (the one you press buttons on)
then you could pick one up at a scrap yard for about $20, however, if you do
indeed have a problem with it, like you said, then that could be causing
your heating problems. That little box controls all the gizmo's and gadgets
under your dash that provide heat or cold air.
.... It does blow out hot air;if I wait about 5 minutes
with the system off, then put it back to 90 degrees,
it puts out hot air for about 20 seconds, then it
turns cool again.
I had an older car that did this. I discovered that
the control valve for the heater water supply in the
engine compartment was jammed almost closed.
With the heater fan off, enough water flowed to warm
up the heater core and turning on the heater fan
provided warm air for a short time, until it cooled down.
A new valve fixed it for me.
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