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Old January 10th, 2010, 03:01 PM   #1 (permalink)
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hot air coming out the bottom vent and cold air out the top vent? 84 delta 88

i replaced my heater core heat works great coming out of the bottom vent that is, for some odd reason cold air blows out the top vents and hot from the bottom vent, i have the a/c/heater controls set to heater and the slider to hot and it does this, i've tried switchin between vent and heater and they both blow at the same time no matter what, before i did the heater core change i used vent so some hot air would come from the top but now nothing, anyone have any ideas to this very weird condition, i dont even know how its possible to be blowing hot and cold from different vents at the same time,
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Old January 10th, 2010, 04:08 PM   #2 (permalink)
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i replaced my heater core heat works great coming out of the bottom vent that is, for some odd reason cold air blows out the top vents and hot from the bottom vent, i have the a/c/heater controls set to heater and the slider to hot and it does this, i've tried switchin between vent and heater and they both blow at the same time no matter what, before i did the heater core change i used vent so some hot air would come from the top but now nothing, anyone have any ideas to this very weird condition, i dont even know how its possible to be blowing hot and cold from different vents at the same time,
It sounds like you have inadvertently knocked off one of the vacuum hoses that controls the HVAC system.
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Old January 10th, 2010, 05:14 PM   #3 (permalink)
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i checked all the vacuum hoses and their all good
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Old January 10th, 2010, 05:37 PM   #4 (permalink)
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Go to main vac line at fire wall Blow cigarette smoke into car & have buddy of yours watch for Smoke while changing modes Guaranteed If vac is problem ( put smokes in tool box 4 next time) HAZARD ! DO Not Buy Lighter or wear shirt with pocket
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Old January 10th, 2010, 10:46 PM   #5 (permalink)
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hmm ill give it a try as im a smoker :-D
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Old January 11th, 2010, 12:04 AM   #6 (permalink)
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Just did a similar repair on my '97 LSS (88) and used the factory repair manual to trouble shoot the problem. (blend door motor) Saved a bundle by not going to the dealer and it works great.
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Old January 11th, 2010, 07:44 AM   #7 (permalink)
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Just did a similar repair on my '97 LSS (88) and used the factory repair manual to trouble shoot the problem. (blend door motor) Saved a bundle by not going to the dealer and it works great.
Glad you fixed your problem, but the 77-90 B-body cars use vacuum diaphragms to switch between floor, dash, and defrost vents. If you lose vacuum, the system defaults to floor and defrost flow. Temperature is controlled by a single heater blend door, located behind the glovebox. A cable actuates this door, except on cars with Tempmatic. In that case the cable sets the temp on the Tempmatic unit and the unit automatically moves the blend door.
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Old January 11th, 2010, 07:48 AM   #8 (permalink)
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A few more thoughts. First, ALL of the vacuum actuators and associated airflow control doors on the HVAC system are on the passenger side of the firewall. The heater core is on the engine side of the firewall. Unless you did something very strange while changing out the heater core, you should not have even been close to the actuators or doors. On the other hand, the vacuum hoses that feed the HVAC system all run right over and around the HVAC box on the engine side of the firewall. There should be a vacuum storage ball strapped to the HVAC box. It is highly likely that one of these was disturbed during heater core changeout.
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Old January 11th, 2010, 08:09 AM   #9 (permalink)
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vacuum storage ball? wow theres a lot of crap i gotta check haha, i did notice that the main vac. line comes from the engine to the heater system maybe i should try replacing all the engine vacuum lines and see what happens
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Old January 11th, 2010, 08:29 AM   #10 (permalink)
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vacuum storage ball? wow theres a lot of crap i gotta check haha, i did notice that the main vac. line comes from the engine to the heater system maybe i should try replacing all the engine vacuum lines and see what happens
Take a breath. If it worked before and doesn't work now, clearly you disturbed something while changing the heater core. If you have money to burn, feel free to replace the lines. I'm cheap, so I like to diagnose the problem before throwing money at it.
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Old January 11th, 2010, 08:35 AM   #11 (permalink)
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Take a breath. If it worked before and doesn't work now, clearly you disturbed something while changing the heater core. If you have money to burn, feel free to replace the lines. I'm cheap, so I like to diagnose the problem before throwing money at it.
haha i dont blame ya i dont like spending money neither, every dollar i save goes in the gas tank tho lol. but the cars old and the vac lines probably havent been replaced in years so its about that time, there is a door behind the heater core against the firewall that opens to let hot air in but thats working fine, so im thinking its a valve door on the inside of the car under the dash somewhere so thats a day job to mess with i just wish someone else has the same prob and figured it out how to fix, but i'll probably fix it without even trying
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Old January 11th, 2010, 12:43 PM   #12 (permalink)
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well i found out the problem, it was the heater core, for one the one i got from advance auto parts is different from the original (a bit wider, no valley between the inlet and outlet on top like my original has) anyway it was blocking one of the doors from opening all the way, and it also was leaking at the fittings found a big puddle underneath the car this morning, store said it might be the wrong heater core and ordered me a new one lets hope its the right one i get it in the morning
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Old January 12th, 2010, 07:37 AM   #13 (permalink)
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just an update got the heater core the store ordered its the right one, fits like a glove, heat works amazing and no more hot and cold air at the same time, the top vent and bottom blow hot like it should thanks for all the help guys
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Old January 12th, 2010, 07:56 AM   #14 (permalink)
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Glad you got it fixed. It stinks that you wated so much time to their mistake.
Moral of the story - always take the old part with you to the store when you buy a new one (or pick it up when it is ordered) to see if it matches up just right, side by side.

On these older cars, I have seen many mixups from the stores - more than I would like. I know we should trust them and their database, but sorry, I cannot any more.
Worse i have seen is the 86 Cutlass Supreme - they often get the little FWD cars confused with the RWDs.
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Old January 12th, 2010, 09:20 AM   #15 (permalink)
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exactly well i usually bring in the old part but since i didnt have a car to borrow to take to the store i had to use mine, yea just like with my heater control valve mine is the metal vacuum activated one i had them look it up and they only had the plastic different kind of control valve, atleast the girl at the register was cute and she drives an olds too
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Old January 12th, 2010, 09:20 AM
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