Information and fuel systems just show numbers and I can't change them when they come on. The blower is on high. Replaced blower control module.
Blower works on high or not? not told at all.
blowers do not blow outside,but the recirc damper does decide the blowers input port path , outside fresh air or INSIDE air RECIRC.
then there is hot and cold
is hot air dead set to hot.>?
if not the engine must be hot, 180 to 200f . scanned. PID ECT sensor.
if hot there I put hands on both heater core tubes, both are hot.
180f , hand flies off hot. if yes core is hot and blend doors or is controller are bad. (i bet this is horror vacuum controls, right??
35 year old car, when did all this work right before.?
the service manuals for old cars are super hard to find.
only in print books, old as heck.
to test vacuum servo's we use 2 tools
a vacuum gauge
and a hand vacuum pump.
we do leak down tests on servo's back then. we wish to forget it .
it is not hard, to do ,tools in hand, and pocket full of vacuum Tee fittings; to tap hoses.
on my car last month I even removed all electric servo's and
operated all blend doors by hand to be sure they are not jammed.
I had a bad blend door servo, (motor actuator a $15 part)
we did the same back then only we used the vacuum pump
the MightyVac tool or the like.
SOURCE: 1998 cadillac deville reads service ac system
Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1
SOURCE: No heat in 91 Cadillac Sedan Deville
I would beleive more that you have build up in the heater core. Try taking loose the heater hoses from the block and use a water hose to spray into one of the hoses letting it come out the other hose then switch hoses with the water hose and keep reverseing for 2/3 times each hose. sounds like stop leak may have been used in a prior time and may be blocking water flow.
Good luck,
Lugnut61
SOURCE: 2006 Ford Crown Victoria HVAC only blows thru windshield defrost
You have a vacuum leak. Defrost is the default postion(no Vacuum). Start by finding the small black vacuum line near the heater hoses at the fire wall under the hood.Trace it back, it should go to a square black reservoir . Not totally sure exactly where it is located on this model,shop manual doesn't show a very good pic, but it states to remove wiper arm and pivot shaft to remove it. You will see a second line going from here to intake manifold vacuum port. Make sure you don't have a leak there somewhere.
SOURCE: ac blows from defrost and not front vents on 2002
I'm pretty sure the door that directs the air between the defroster and front vents is vacuum actuated. Check the vacuum lines in the engine compartment that go to the firewall. Find an approx 1/4" rubber hose that goes into the firewall around the center of the firewall and trace it back to the motor and make sure it hasn't come loose.
If not that, then it may have come loose at the a/c control panel. That will be much more difficult to get at to check. You may be able to access it through the front of the dash.
Good luck.
SOURCE: LOCATE AND TAKE OUT GMC ENVOYS BLOWER CONTROL MODULE
should be on the passenger side under the dash. Remove the lower dash panel and look up under the dash. you will see the blower motor and then to the left a little you will see a plug attached to a relay/resistor switch. It is held on by two screws. The Envoy is the Trailblazers sister so you may have the same issue I had. Seems like the ground is not sufficient enough causing the ground wire to get hot melting the plugs together. I had a very hard time getting them apart but did. Purchased a new relay/resistor switch and repaired the wiring myself. GM wants $100.00 bucks for the plug. Hopefully you don't have a G/F or wife like mine that thought kicking the fan speed control switch would make it work. I had to also replace that due to her breaking the switch.
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