Question about 1987 Cadillac Fleetwood

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Air conditioner air flow

My upper vents stopped circulating air. This started after I changed the o2 sensor. Mybe I accidently dislodged a hose from the blower. Is there a diagram of that system available on-line?

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  • Steve DuBose May 30, 2008

    I did what you suggested, and did discover a dislodged vaccum hose. The problem resolved, thanks

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Actually there is a diagraman go to autozone.com and then you can buy the diagramas for that specifici car just look for alldata,
or what i can sujest is to look for a small black disconected hose closed to the area you did work because most of this a/c systems are controled by vacium and if you accidenatlly unplug a hose thats what happend, you can also try to locate this hose with the car runung a look for a noise like air leak

Posted on May 29, 2008

  • fernando arevalo May 31, 2008

    you are very welcome and i will apreciate your feedback to me thanx

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1 Answer

No air coming through vents


There are 3 likely possibilities:

  1. Bad heater motor - a dead heater motor means no air flow
  2. Disconnected or hole in air flow hose - sometimes a vent hose will dislodge just enough to disrupt air flow. Check underneath the inside of the passenger compartment for any loose hose connections. You can also turn the heat (or vent) on HI and check the air flow hose for any pinholes that also could disrupt your air flow
  3. Bad Control Center - if the Control Center is bad, it won't trigger the heater motor to turn on and push air

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My car sounds bad. it smells like gas when started. and it runs bad. also the check engine light is blinking


Check engine light is blinking a code, a auto parts store can read codes for you most the time its free, sound like maybe a few diff things, the EGR valve maybe stuck open or shut, or a O2 sensor, or Mass Air Flow Sensor, they do make a mass air flow cleaner thats the only thing you can use on it, the mass air sensor is just after your air filter on the tube that runs to the motor, the O2 sensors are on the pipes before and after the converter. Egr vents the non burnt gas back in your motor to re burn it the pipe coming off the manifold back up to the top of motor should see a egr would have a round diaphram looking thing on it. start with the codes being read at auto zone or O''rillys. i know on that that Rodeo you have to change the PCV valve about every 15,000 mi it vents the air out of the motor, run about $3, worst case senario it jumped time,

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Just quit running...start and idel 3-4- sec. then dies. Ive changed fuel filter, plugs and wires, and new fuel pump... does the same thing. My check engine light has been on for some time now. (o2 sensor)...


It definitely sounds like the O2 sensors. See if you can get them replaced and see what happens. Remember that there are 2 O2 sensors; an upper and a lower. The upper one will probably be on the top of the engine where the air flow breather goes into the engine. The lower one will probably be on the bottom of the engine actually on the tailpipe itself close to the firewall. I had to replace my O2 sensors in my car, whenever I would stop at a red light it died. I hope this works, it stinks not having a ride, I know.

Sep 19, 2010 | 1995 Toyota Pickup

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04 vw passat,1.8l.changed rear o2 sensor,now engine stumbles,is there a reset sequence?


remove the battery for half an hour, then reconnect it and the ecu should reset. After turning on ignition wait till all clicking and whirring stops before starting it, and check you havent dislodged the airflow meter connector on the airfilter when you did the o2 sensor, as this, or an intake air leak, is more likely to cause a stumble than the o2 sensor.

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2002 vw passat....starts fine and drives fine....periodically stalls when braking for stop..this happens after a few miles of driving and is hard to get going again but will start and if reved up a bit I...


It appears that your brake booster system has a major vacuum leak which is causing the engine to go lean and stall. Check the hose between the intake manifold and the brake booster. It may be cracked or loose causing outside air to enter the hose when the brake is applied.

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The heat did not work when i got my 98 ford taurus i changed the thermastat, and theres no water in my floor so what could it be?


Heater core could have build up in it and have a restricted flow....thus your heater would not be blowing as hot of air. You should do a pressure test on your cooling system to see if you are loosing any coolant...and where (if your water pump is loosing then you would not be getting the proper circulation).

You can also do a check by starting the engine cold. Grab the upper hose and you should not feel any coolant flowing through it. When the engine begins to get uo to temp the properly working thermostat will open and you will begin to fell coolant flow through the upper hose. When the engine is up to temp your upper and lower hoses should feel hot.

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1999 ford E150 starts and runs fine, after warm up at idle, rpms varry. will stall at stops but starts and runs fine at high idle and on highway. Trouble codes are 02s bank 1 and bank 2, both lean. also...


I had same problems w/ my 99 Chateau 5.4L. EGR-Ensure port into intake and pipe from exhaust are clear using low pressure compressed air. Pull vacuum on EGR diaphram and ensure it opens and closes smoothly. If this checks out then problem is probably in the EGR sensor (mine had both ports and hoses clogged w/ aluminum corrosion from the sensor, cleaned out hoses and lines to exhaust pipe w/ compressed air, ended up having to change the sensor). IDLE AND O2 SENSOR- Caused by vacuum leaks in the PCV line (line is plastic wrapped w/foam insulation; was cracked under the insulation; both rubber end connectors at manifold and pcv valve were softened, collapsed and leaking; allowing excess air into the manifold after the mass air flow sensor which throws off the O2 sensors. engine computer does not read O2 sensors until after engine is warmed up which is why idle is fine until then).

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1 Answer

Location of sensors


IAT SENSOR IS MOUNTED INSIDE INTAKE AIR HOSE TO THE AIR CLEANER ASSEMBLY. THE MASS AIR FLOW SENSOR IS ALSO MOUNTED TO THE INTAKE AIR HOSE OF THE AIR CLEANER ASSEMBLY. O2 SENSORS LOCATION.YOU HAVE 2 # O2 SENSORS.YOU HAVE ONE THE EXHAUST MANIFOLD.THE OTHER SENSOR LOCATED DOWN AT THE CATALYTIC CONVERTER.

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1 Answer

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