When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Wow Red, I take it you're very serious about hot air in your 996! I don't bother with it, that's what my wife is for. hahaha Seriously, keep up the good work and for goodness sakes, don't break anything! lol
Wow Red, I take it you're very serious about hot air in your 996! I don't bother with it, that's what my wife is for. hahaha Seriously, keep up the good work and for goodness sakes, don't break anything! lol
It gets cold here in Kentucky. And even on Spring and Fall nights it's a good thing to have. I enjoy driving around with my top down all year long. Heat is needed. Figured that if I fuch things up too bad it won't be worse then what I already have. Worse case scenario I'll divert all water flow from the heat exchange box and only have AC. The GF puts out a lot of heat, and I love it, but she is not always in the car with me. My goal is to finish this project after work tonight. I'll let you guys know if it works.
Also. What if I reached down and put tape on the part of the flap that I can see from the outside? Does the smaller half run the heat and the larger the AC?
I'm in the same boat as you, red. Exact same symptoms.
Coolant was good, burped the system. Replaced thermostat, replaced radiator.
I am ripping my dash out next month to put in a new dash with a glovebox. I'll be taking care of the foam then. I hope that will be the end of the rabbit hole, as there is nothing left to do after that.
Also. What if I reached down and put tape on the part of the flap that I can see from the outside? Does the smaller half run the heat and the larger the AC?
I would give that a shot, I'll probably try the same when I get around to it.
For those who aren't great wrench turners (like me) and a little lazy (definitely me), how much will the dealer charge to repair/replace the flap or an independent for that matter. I have the exact same symptoms; polar cold with the AC on but no heat at all.
The blend doors in the underdash HVAC box are what causes the problem. Really have to take the whole dash apart to fix the foam on the blend doors. That being said, my 99 C2 puked all of the foam out the vents years ago and I still have plenty of heat and AC. Of course now with that being said, for a temporary fix (maybe for those cold winter months), wrap the pollen filter in plastic so NO outside air gets in the cabin. That way there is no outside air blended in the HVAC box and all you will get is heat and AC. Put heat on high and push the recirc button so only inside heated air gets recirculated through the system.
I've never seen an estimate from a dealer for repair to the blend doors....but since it entails pulling the entire dash apart, I would imagine very big bucks. Even the alternate route of pulling out the heater core to access the one door...well, I don't think a dealer would go that route. They probably would say "we have to replace the whole unit with new". Very big $$$$.
The blend doors in the underdash HVAC box are what causes the problem. Really have to take the whole dash apart to fix the foam on the blend doors. That being said, my 99 C2 puked all of the foam out the vents years ago and I still have plenty of heat and AC. Of course now with that being said, for a temporary fix (maybe for those cold winter months), wrap the pollen filter in plastic so NO outside air gets in the cabin. That way there is no outside air blended in the HVAC box and all you will get is heat and AC. Put heat on high and push the recirc button so only inside heated air gets recirculated through the system.
.
I SO wish I had thought of this before tearing into my 911.
The blend doors in the underdash HVAC box are what causes the problem. Really have to take the whole dash apart to fix the foam on the blend doors. That being said, my 99 C2 puked all of the foam out the vents years ago and I still have plenty of heat and AC. Of course now with that being said, for a temporary fix (maybe for those cold winter months), wrap the pollen filter in plastic so NO outside air gets in the cabin. That way there is no outside air blended in the HVAC box and all you will get is heat and AC. Put heat on high and push the recirc button so only inside heated air gets recirculated through the system.
I've never seen an estimate from a dealer for repair to the blend doors....but since it entails pulling the entire dash apart, I would imagine very big bucks. Even the alternate route of pulling out the heater core to access the one door...well, I don't think a dealer would go that route. They probably would say "we have to replace the whole unit with new". Very big $$$$.
To be clear - LOL. Are you saying the filter that's in the frunk near the battery -
1. wrap it plastic
2. heat control on high
3. turn on recirc button
And presto - Heat in the cabin
It can't be this simple LOL - super curious how you discovered this.
To be clear - LOL. Are you saying the filter that's in the frunk near the battery -
1. wrap it plastic
2. heat control on high
3. turn on recirc button
And presto - Heat in the cabin
It can't be this simple LOL - super curious how you discovered this.
Ummmm....yes. The problem with the deteriorating foam on the internal flap doors is that the blend doors no longer provide adequate flow control from outside air getting into the cabin. The entire mix within the HVAC box is uncontrolled. By blocking the pollen filter, the only source of outside air to the HVAC box, putting the heat on high and recirc will only allow inside cabin air to be recirculated and heated, and not mixed with uncontrolled outside air entering the system.
And it may continue to blow bits of foam into the cabin. Red, you're almost there with this fix. I'm sure you can finish it - you've done most of the hard work already.
Ummmm....yes. The problem with the deteriorating foam on the internal flap doors is that the blend doors no longer provide adequate flow control from outside air getting into the cabin. The entire mix within the HVAC box is uncontrolled. By blocking the pollen filter, the only source of outside air to the HVAC box, putting the heat on high and recirc will only allow inside cabin air to be recirculated and heated, and not mixed with uncontrolled outside air entering the system.
will keep this in mind if I every totally loose heat!
Spent a good amount of time trying to reach the bottom of the flapper. Then I did something..... Wish I had done this to start with. I removed the stereo, HVAC computer thing and the upper vent (7 minute job). Then I took a freaking razor blade and I cut a hole big enough for my hand to fit through in the air chamber. I then reached in and taped it up. Then I taped up where I cut the hole. Problem solved. I now have heat. If I had it to do over again I would do as the previous posted said and plugged the fresh air vent.
From looking at that picture, can we see the hole that you taped up? I don't know the location of the flaps and I'm trying to visualize what you did..I may do the same!
02-19-2019, 10:19 AM
If I had it to do over again I would do as the previous posted said and plugged the fresh air vent.
