Lack of Heat December 14, 2009, 05:45:16 PM So my 88 thunderbird has never really given off a lot of heat. If i put the fan on high, it blows warm air but for the loud sound of it it seems like there should be more air coming out. When its on floor, its barely enough to keep my feet warm. When its on "mix" the same amount comes to the floor and a little up to the windshield. Never does warm air(any real amount) come out of the vents in the dash. The dash was only taken apart once, when I did the heater core, and none of that stuff was really touched. Just wondering if maybe everyone else heater isn't great also, or if something is wrong. Any ideas?It has pretty much been this way since I bought the car. Even when the car has a v6 in it. Any suggestions? Quote Selected
Lack of Heat Reply #1 – December 14, 2009, 06:42:49 PM Mines kinda like that. It gets pretty warm but the volume isnt there for the noise the blower makes. Quote Selected
Lack of Heat Reply #2 – December 14, 2009, 07:47:11 PM Ditto, my 83's HVAC setup sucks. Quote Selected
Lack of Heat Reply #3 – December 14, 2009, 09:06:42 PM well it seems there isn't a problem with it them. Has anyone improved on this at all? Any modifications that can increase the flow of air or something to improve? Quote Selected
Lack of Heat Reply #4 – December 19, 2009, 01:40:04 PM For any of you, is there a setting where heat will plow out of the cutouts in the dash? When I put it on mix, i feel it should come out through those vents but it doesn't. Quote Selected
Lack of Heat Reply #5 – December 19, 2009, 03:58:08 PM A vacuum leak will make the HVAC default to the defrost vents, so you will lose your dash vents with any HVAC selection. Look for vacuum leaks at the lines on the firewall. When I had my '86 2.3, I rebuilt the entire cooling system (including heater core, rad, pump, lines, etc.) and fixed every vacuum leak I could find. Even after all that work, I never had good heat in the car. It was lukewarm at best, which was very annoying. The heat in the '96 will melt your face. Quote Selected
Lack of Heat Reply #6 – December 19, 2009, 04:19:29 PM Alright. I'll have to check for a vacuum leak. Thanks for the information. Quote Selected
Lack of Heat Reply #8 – December 20, 2009, 09:11:20 AM I've always been happy with the heater in my Birds, I defiantly don't need the high setting to stay warm and toasty. You don't say if you have the EATC but the manual set-up has a "vent" setting in the middle of all the options. (It's not really under the heat section of the controls but it is right beside.) If your not getting hot air out of your heater I would think that would because the coolant in your system is to cool, in other words a thermastat that is stuck in the open position. Just my opinion though. :D Quote Selected
Lack of Heat Reply #9 – December 20, 2009, 03:10:15 PM Well you bring up an interesting point x3. What degree thermostats are you guys using? I think mine is a 195. And I know the coolant gets hot, because I've had problems with the temperature gague acting up in the past and telling me the car is over heating when its clearly not. Quote Selected
Lack of Heat Reply #10 – December 20, 2009, 03:46:30 PM The air should go to the dash vents on: A/C Max, A/C Norm, Vent and Mix. Air should not go to the windshield on any of these settings.See if you have better air flow in the A/C Max setting. This blocks the outside air and recirculates the inside air.All other settings use outside air and it may be blocked with debris.Even with low air flow the air should get warm if the heater core is heating up (feel the heater hoses) and the blend door is in the warm position. The blend door is mechanically operated by a cable to temp control lever. (With manual controls)If you have EATC, all of the HVAC doors are controlled by electric motors. Quote Selected
Lack of Heat Reply #12 – December 20, 2009, 10:46:34 PM Quote from: jpc647;303291Well you bring up an interesting point x3. What degree thermostats are you guys using? I think mine is a 195. And I know the coolant gets hot, because I've had problems with the temperature gague acting up in the past and telling me the car is over heating when its clearly not.I run the 195 also, it is what came factory, just because the factory gauge shows it running hot doesn't mean much, the factory gauges are known for being inaccurate. Alot of thermastats are made that are fail safe so that if they go bad they get stuck in the open positon to prevent you from cooking your engine. I am not saying that this is your problem. But if your air coming out of your heater is lukewarm at best then there is really only one reason for it, which would be the coolant inside the heater core isn't hot enough. Quote Selected
Lack of Heat Reply #13 – December 20, 2009, 11:32:57 PM Alright. I'm not sure what to do. I don't know how to increase the temperature of the coolant. My temp gauges normally rides aroun 3/4. Before the motor swap it never went past 1/2 way. But I tried to figure that out and I never could. The temperature gauge will be 3/4 but the coolant will be cold.. Quote Selected
Lack of Heat Reply #14 – December 21, 2009, 03:48:39 AM go through the EVTM link i sent you.basically you need to verify your internal hvac vac lines are clear. I dont have the colors memorized on what goes where but I will tell you that it would be easy to kink the flexible plastic tubes that are burried in there.the first thing to do is remove the glove box and the hvac control panel. start figuring out what lever opens / closes what door. when you remove the glove box, there is a silver canister off to the left that "I THINK" is the main vac door actuator.My 20th runs me out of the car, the white coug also does the same. Quote Selected
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