It stirs my ire to talk about Buick A/C systems, because just about everyone
I know has had trouble with them.
I am certainly not an expert at these systems, but you might try the
Make sure you don't have any vacuum leaks or blocked lines, first of all.
all vacuum hoses, vacuum cannister connections, etc. If you lose vacuum to
key point, the AC may not function correctly. I believe the doors within
HVAC plenum are controlled by vacuum in your car.
BUT, Buicks are also notorious about failure in their dammittohell
HVAC computer. Maybe there is a diagnostic tool to wring these out, but I
A new one of these typically runs several hundred dollars ($600 the last
friend took her car to the dealership.) If you are handy and persuasive,
get someone at a wrecking yard to lend you one to try out.
Maybe someone else has the better information for you.
Hmmm...glad you mentioned this.... my girlfriend has a 1994 Buick Regal, no
a/c. I charged it, but never had the time to troubleshoot so she brought it
into a friend who works at a service station. Friend said ....something....I
don't think she understood exactly what, but the end result is he ran a
wire to something under the hood, and put a toggle switch on her dashboard.
Whenever she wants a/c she just has to hit the switch and it works. I haven't
had the time to even look at the thing to describe exactly what he jumpered.
ps...he charged $300.00 for running a wire and a sp toggle switch --- but
she wasn't going to get it fixed any other way.... during the hot summer months
it was more than worth it !!! The cost of the wire and switch was about 4 bucks
the other 296.00 was for knowing what to jumper around.
It sounds as if the Buick AC is a decendent of the auto temp system in
the 76 Pontiac Gran Prix I once had - this 'thing' had an air intake on
the dash that went to a sensor on a chassis behind the glove box that
had several vacumn motors connected to it along with a bunch of vacumn
hoses to move a lever that had a cable attached to it that ran to the
actual temp setting lever on the heater control....talk abt a Rube
Goldberg setup....naturally both the hoses and vacumn motors would go
south - and were hard to get even from the dealer, although at least
10 feet of wire and a switch was not the 300 buck charge! it wuz the
knowledge of finding the correcct green wire.........hopefully the wizard
hooked it upstream of the cutout switches for comp. safety.......im not
downplaying his repair. i have done simular in my youth and may do it
again in my retirement years.......300 does sound pricey for a quickey
Default air flow with no vacuum supplied to the HVAC system is to the
CHeck the rubber hose from the vacuum distributor on the intake plenum
(firewall side of plenum - you'll have to remove the sight shield to
see it) to HVAC system. I'll bet that if that hose is original it is
leaking like a sieve!
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