Guest imported_barra Posted May 2, 2003 Share Posted May 2, 2003 I recently had the A/C in my '89 converted to the 134A system. The technician told me that the everything in the air conditioning was fine. He found, however, a "blockage" in the ducting/hosing( my term, not his)in the lower dash area that prevented the cold air from entering the passenger compartment. This similar lack of air flow from the heater was also an issue prior to the conversion. The bcm was changed but the problem continued. Is there some pressure regulating switch that controls the flow of air into the car's interior? The defroster works very well and the heat that it provides is considerable. Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted May 2, 2003 Share Posted May 2, 2003 you have a "diverter" problem do a search and find many solutions. Link to comment Share on other sites More sharing options...
harry yarnell Posted May 2, 2003 Share Posted May 2, 2003 You also may have a leaking evaporator that is oil soaked and covered with lint/dirt to the point that air can't pass thru it. Seen it may times. Remove the blower controller from the plenum and with a good light, inspect the fins of the evaporator. Link to comment Share on other sites More sharing options...
padgett Posted May 2, 2003 Share Posted May 2, 2003 Need more information. Does air come out of defroster duct all of the time and nowhere else or only when you select defroster ? Do you get flow only when set to MAX HEAT and not at MAX COOL ? Is the fan allways running or again do you need to select defrost ? Need to try all settings but first would want to make certain fan is turning when have no flow. Link to comment Share on other sites More sharing options...
Guest BREH Posted May 3, 2003 Share Posted May 3, 2003 Mine did the same thing after I cleaned the engine, I found the problem to bea vacuum line was disconected,located just in front of the firewall.Hope your is that easy. Link to comment Share on other sites More sharing options...
Shelby Posted May 3, 2003 Share Posted May 3, 2003 Do you check to see if the A/C coil is plugged with "crud" Pretty common Link to comment Share on other sites More sharing options...
bcrdoc Posted May 17, 2003 Share Posted May 17, 2003 How hard is it to check the a/c coil?Paul Link to comment Share on other sites More sharing options...
Shelby Posted May 17, 2003 Share Posted May 17, 2003 It take a couple of hours to take the blower motor and Sencor(can't remember the real Name) and wash the crug out. them putever thing back together and clean the drive. That crud that come out of there is BAD loooking stuff.Take as much time almost to look as fix it. Link to comment Share on other sites More sharing options...
bcrdoc Posted May 18, 2003 Share Posted May 18, 2003 where is the a/c coil and what does it look like?Iv'e already had my mechanic remove and check the evaporator( the part on the firewall) and it was clean. Link to comment Share on other sites More sharing options...
padgett Posted May 18, 2003 Share Posted May 18, 2003 Coil - evaporator same-same (I can never remember which is the evaporator and which is the condenser but is on on the firewall.Just realized you said the defroster worked well. That does confine the situation a bit. Does it come out there all of the time or when somewhere else the def stops also ? Link to comment Share on other sites More sharing options...
Guest wally888 Posted May 19, 2003 Share Posted May 19, 2003 You may have 2 problems. Up/Down door or actuator failure will cause A/C (cold air) to come only from Def. vents. You need a Manual! You can check vacum and for movement of actuator arms with your hands once you identify actuators. You can also hear doors as they open close with all turned off except low fan. Diagnostics will tell you the commanded functions and the % of various door openings. Need Manual! Link to comment Share on other sites More sharing options...
Guest imported_barra Posted May 19, 2003 Share Posted May 19, 2003 The heat pours out of the defroster when I select the defroster. Otherwise there is only "passive" heat coming through the floor vents with any fan setting. I drove with the windows down the other day and there seemed to be more cool air flowing through the car. I have never felt any significant air flow on any setting coming through the dash vents with the lever set at the on position. I hope I have described the situation accurately enough for a diagnosis. Link to comment Share on other sites More sharing options...
Guest imported_barra Posted May 19, 2003 Share Posted May 19, 2003 I responded to one person who had a manual for sale on the site but got no response. I also read the requests that one of the contributers has made of GM for permission to provide the information on line. I have thought about trying to buy the manuals from the local dealership. They have said that other owners from the surrounding area bring their cars here so I doubt they'll part with them. Thank you for reading and responding to my post. Link to comment Share on other sites More sharing options...
Guest wally888 Posted May 19, 2003 Share Posted May 19, 2003 I thought you had cold air from defroster! If not, it is not the up/dowm door, probably, if it is a door, it is the (what I call the Main door) It is driven by a small elec. motor. May be stuck in heat position. Wife's caddy was stuck in Cold position-no heat. You can remove glove box , see, disconnect the arm to door and manually change positions w/ A/C on to see if that is problem. Link to comment Share on other sites More sharing options...
Guest imported_barra Posted May 19, 2003 Share Posted May 19, 2003 Thank you. I'm orderng the complete system from Mr. Finn- programmer, servos, conecting hoses/tubes. If it's going to be in the car, it should be functional. Link to comment Share on other sites More sharing options...
padgett Posted May 19, 2003 Share Posted May 19, 2003 Sounds like the fan is working only in the defrost position. With windows open you are getting some airflow through the vents because the base of the windshield at the air inlet is a high pressure area when moving.The circuit that feeds the blower motor should be in section 8A-66 of the FSM and the signal starts in the BCM, goes through the HVAC controller to the blower power module. There is also feedback involved so is not a simple thing.Suppose it would be a good idea to swap the controllr first and see what happens. Link to comment Share on other sites More sharing options...
charlie1 Posted May 19, 2003 Share Posted May 19, 2003 the 1989 gm products have a reputation for having leaking evaporators.had mine replaced.boy was it dirty as well !good luckcharlie Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now