Thread: No HEAT!! Getting cold in the North East...

I put the car in the air just to check out the "other side". Yes, there is nothing there. ;-) I went thru the whole climate control system and I can't find the cause of the problem. I'll have to take it in and try out service @ Premier Lotus in Branford, CT. I believe it has to be either the rheostat (sp?) or one of the actuators. Thanks for all the help folks! AK

Here is a diagram of the two flap valves. There is a stepper motor that directly drives the top one and a belt to the lower. Cheers, Michael

it neither of those are it, could be a bad rheostat on your temp control knob?

No need to put it on the lift, there is nothing to access from the bottom of the car.

i'm also having those exact same symptoms. guess i'm gonna have to take out my center vents. what do i do if the flap isn't flapping? also, more on the rheostat thingy... is that something i can take care of myself with my basic/general car maintenance knowledge? thanks in advance for any help!

If you have absolutely no heat it's not the reostat. If there's heat but not enough of it then I'd check the reostat.

I know this is a really basic thing, but did you check to make sure the heater matrix is actually getting hot and doesn't have air trapped in it? Just get the engine up to full operating temperature and feel the heater hoses going in and out of the heater box. If the inlet is hot, but the oulet is cold, you have a heater core full of air and that would be the reason you have no heat.