Heat Problem HELP

[ChrisP911]

Ok I looked on here for my heat problem with no luck.

1982 911 SC

I pull the two levers up I get very little heat that comes out on the side of drivers dash and passengers side dash. Very little comes out of defrosters. I move the top leaver on the controls for the fan and cold air comes out of defrosters stronger then before. nothing comes out to warm up my feet

its cold out and I love driving this beast.

[pete3799]

Top dash lever is for fresh air......leave it all the way left (off).
Both floor mounted levers up, middle dash lever to the right = defrost to the left = floor.
You'll need to get under the car and verify that both heater flappers are closing fully to get max heat.

[ChrisP911]

Ok cool thanks pete

[86 911 Targa]

^^^^^
Here you go.
Good luck,
Gerry

[wrxnofx]

In addition to verifying that the flappers are closing, verify that the tubing is properly connected from the heat exchangers to the flappers. When my heat dropped in intensity, I noticed that the drivers tubing had become disconnected from the heat exchanger.

[wwest]

Originally Posted by ChrisP911

Ok I looked on here for my heat problem with no luck.

1982 911 SC

I pull the two levers up I get very little heat that comes out on the side of drivers dash and passengers side dash. Very little comes out of defrosters. I move the top leaver on the controls for the fan and cold air comes out of defrosters stronger then before. nothing comes out to warm up my feet

its cold out and I love driving this beast.

With the engine idling there is very little flow provided via the engine cooling fan, the flow at that time is "boosted" by the cabin heat blower in the engine compartment.

That blower is highly prone to fail.

As a general rule iof you do not feel resistance in lifting the control levers then you are likely not opening the flapper valves under the car forward of the engine.

"...very little...defrosters..."

Pretty much SOP for cars build before the footwell blowers were added for just that reason, BOOST the defrost/defog/demist airflow.

If you encounter windshield fogging your best bet is to lower, crack, the windows open slightly, turn the fresh air fan full on, (both will help to lower cabin Rh) and get as much engine heat to the windshield airflow ducts as is possible.

Has anyone ever retrofitted footwell blowers to an older car?

With regards to defogging he windshield and/or preventing windshield fogging the footwell blowers in my '88 make a world of difference vs my '78.

[pmax]

+1 on the engine compartment blower. I just replaced mine.
Chances are it's broken especially when you don't get heat at idle. However, it does not run if the engine's not started but should fire up when you lift the levers with the engine running.

The alternative is to always keep the rpm's up when driving so the cooling fan pushes enough heat into the cabin for you.

Good tips on closing the fresh (cold) air vents, top lever to the left. That should work unless you have a targa

[ChrisP911]

no its a coupe, not use to the air cool motor yet. I was use to my 02 turbo had plenty of heat even heated seats.

[Bob Kontak]

Originally Posted by ChrisP911

I was use to my 02 turbo had plenty of heat even heated seats.

Heated seats? Pffft.

Here's the deal.

Your motor kicks out enough therms to set your toes on fire. If you ain't getting it to your toes, it's a simple mechanical malady, even with no blower assist.

1. Blower (engine) should kick on when you lift one of the two levers.
2. Levers should open and close heater boxes nice and clean
3. Array of air hoses behind the front trunk cover (remove it - for inspection) should all be intact
4. Levers on dash should robustly operate the open close mechanisms in the cluster eff of hardware/tubes behind the cover in the front trunk.

[ChrisP911]

Thanks guys im off tomorrow so I will take a look and see what is wrong.

[DRACO A5OG]

+1 Flapper Boxes the cables stretch over time and will not properly seal the boxes or a dislodged hoses but both at the same time seems unlikely unless P/O or wrench forgot to connect them on a engine drop. Either you can inspect both while you are under there.

A helper working the levers will really help :-) just make sure she is on jack stands for safety.

[Jack Stands]

Also, dropping down a gear so the engine is at a higher RPM will always help increase the airflow into the heat exchangers and help. I still think that my old SSI system in my old Targa worked just as well without all the fans and relays of tmy current Carrera's system.

[ChrisP911]

I think this might be my problem.....

[frosty2]

Hi Guys not trying to hi-jack a thread but seeing as your discussing heaters I am currently running expossed headers with no heat.
North of the border a little heat would be nice so I thought I would try fastening a piece of pipe to the outside of the header and let the header warm it up and the air that passed through the pipe, i've seen this done somewere.
My flex pipes are all in place from the cabin fans back to the flapper valves under the car but nothing from there to the header pipes or engine yet.
Anyway before I started to hook everything up thought I would see what happens when I open the valve under the drivers side and turn on the fan via the dash slider controls and the air blows out the valve blowing back towards the
headers or engine compartment.
I expected the air would be sucked in the valve like going from the header to the cabin.
What am I missing here I did not bother hooking any thing up as to me the air seems to be traveling the wrong direction.

Thanks
Mike

[ChrisP911]

Well fixed the one problem, I still get hot air from the two side vents. warm to cool air at defrosters and cold air on my feet. please help its cold ........

[Jack Stands]

Is your engine blower motor working? It should be blowing air through the heat exchangers when the levers are raised. On my '84 Carrera, there is also a relay for the entire system on the left side of the engine compartment, but I don't know if these are on an SC as well.

I assume your heat exchangers are in good shape. Any holes in the system that allow warm air to escape will obviously decrease the cabin heating, so they should be addressed.

[RSBob]

Originally Posted by ChrisP911

Well fixed the one problem, I still get hot air from the two side vents. warm to cool air at defrosters and cold air on my feet. please help its cold ........

Check inside the frunk and make sure when you move the heat lever from left to right that it is moving the wire like assembly from one direction to the other. If you don't have someone to watch for movement, then put some tape on the rods/wires, then put some tape on them and see if they move. These are behind the cardboard piece in the frunk.

[ChrisP911]

Originally Posted by Jack Stands

Is your engine blower motor working? It should be blowing air through the heat exchangers when the levers are raised. On my '84 Carrera, there is also a relay for the entire system on the left side of the engine compartment, but I don't know if these are on an SC as well.

I assume your heat exchangers are in good shape. Any holes in the system that allow warm air to escape will obviously decrease the cabin heating, so they should be addressed.

The prior PO deleted the rear blower motor

I just bought one last night from a local guy... I also have some footwell blowers from my Carrera that I plan on installing.

[RSBob]

I backdated my heat, so tossed the dead heater blower motor and still get tons of heat on my feet even with the temps in the 20s when running at 35+ mph.

[wwest]

Originally Posted by RSBob

I backdated my heat, so tossed the dead heater blower motor and still get tons of heat on my feet even with the temps in the 20s when running at 35+ mph.

Sure, running in lower gear not appropreate for 35+ MPH.

I deleted the engine fan source in favor of a CONSTANT heat flow regardless of RPM.

Also modified the cabin heater blower wheel inlet to get more flow.