Ooops, there are also a couple of flapper doors controled by solinoids under the dash that redirect air to the heater core and also to the different vents, If these solinoids arn't working then they will now allow the hot air to go to the right places, or by pass the fan air around the heater core all together.. There is also a valve in there some place that shuts off the water flow to the heater core like when you've got the a/c on.. I beleve this valve is also controled by a solinoid as well or it may be mechanical. This solinoid or cable is controled by the temp knob.. any of these will also give you no or very little heat..



If your cold and lazy, you can also pull the rubber boot off of the shifter well... You'll get some nice warm air out of there... https://www.nopistons.com/forums/pub...#>/biggrin.png

If you have good heat temps from the florr vents and the defrost vents, but not the main dash vents then there is nothing wrong. I went through this myself quite a while back, after some deep research I found out that mazda did something to the controls so that there will no be full heat out of the dash vents. (I was told this was so you don't fall asleep from all the hot air hitting your face). How true that is I don't know, but I do know many people with fd's that ahve good heat output except for the main dash vents

I get just as much heat out of my dash vents as anywhere else... And every other FD I've been in put out heat like a mofo as well (and that's quite a few FD's).. I think that what ever is broke on your cars is just a common part that breaks on the FD heating system.. If one of you figures out what it is make sure to post it so all the other people here can fix their ****.. https://www.nopistons.com/forums/pub...#>/biggrin.png

I get good heat from the dash vents and the floor vents, but not at the same time. If I try to have heat come out of both the upper and lower vents it seems that the temperature of the air is reduced significantly. I usually just put it on one or the other. Good luck.



Kyle

well... on a 93 touring. heat comes good from up top and below. the only thing that is bad is that the right center vent doesn't give heat. its the same on my moms 93 626. its weird. we thought it was just a problem with mazda's.

Hmm.. just an idea, but if it's really cold where you live you might want to try and block off part to 1/2 of the radiator with some cardboard.. the cars are probably over cooling...

yeah my FD has no t-stat i think. took freaking forever to get heat. froze my ass off LOL