[fezcabdriver]

So what is the real point of this thing? Mine was missing and after much searching on the forum I still don't have a clear indication as to the point of this.

Is it so that I'll be able to fine tune my cabin temperature? As in, does it pass cabin temp back to a sensor and the sensor does some sort of adjusting?

Or does it fix the always hot air blowing issue? I'm not sure as it fixed it as it is no longer 90+ degrees. I sense a difference in temperature???

 

[uberwasser]

It does move cabin air over a temp sensor, this is what your climate control uses to determine how much hot or cold air to blow to get the cabin temp to match what you've selected on your temp wheel.

 

[cooljjay]

That strange, I wasn't aware an 1985 had it behind the glove box....I thought it was more in the center of the dash on a 85.....the evil acc has it right behind the glove box liner.....its a easy cheap fix, just go to the plumbing section of the hard ware store and but a 10ft piece of the hose insulation you put around water hoses.....I warped the ends of mine with electric tape to hold on the connectors sunger

 

[fezcabdriver]

yes.. it is more towards the left. You are correct.

 

[rocky raccoon]

replaced mine

with thick wall clear plastic tubing. Good, precise temperature control and will last much longer than the foam.

I always wondered why they used that stuff in the first place.

 

[Cycobilly]

I did this in my '83 and '85.

Get a foot of 3/4" i.d. vinyl tube at a hardware store, cut it about 7"-9" and install where the foam was (measure the gap between the end of sensor outlet and end of fan housing inlet and add 1/2" to 1" to ensure fit). The tube remains secure on its own.

I always wondered why they used that stuff in the first place.

I think it was a financial decision. The foam is cheaper and easier to install by comparison.

 

[sethwm2]

I am interested in this tube I have issues with my climate control not being accurate all the time.. I have replaced the CCU and mono valve in both cars. Can someone post pictures of where this tube should be behind the glove box and how to take the liner out? Thanks

 

[sethwm2]

Also, how many temp sensors are there? I would like to replace them. How easy is it to get to the heater box temp sensor?

 

[fezcabdriver]

Liner is easy.. 7 push pins in the glovebox. Once you pull it out it will look like the link that cycobilly posted above. ..at least this was the case in my 85.

 

[Cycobilly]

Liner is easy.. 7 push pins in the glovebox. Once you pull it out it will look like the link that cycobilly posted above. ..at least this was the case in my 85.

I did that keeping the glove box in place, from underneath the dash after removing the kick panel. It's easy enough to reach past the glove box to remove the deteriorated foam and install the tube.

Eventually I'll get out to a salvage yard and do the same thing after removing the glove box to get better photos of the repair and component location.

Also, how many temp sensors are there? I would like to replace them. How easy is it to get to the heater box temp sensor?

Only one, located about the center of the dash. You should see a small vent for it.

 

[sethwm2]

I did that keeping the glove box in place, from underneath the dash after removing the kick panel. It's easy enough to reach past the glove box to remove the deteriorated foam and install the tube.

Eventually I'll get out to a salvage yard and do the same thing after removing the glove box to get better photos of the repair and component location.



Only one, located about the center of the dash. You should see a small vent for it.

I can't really tell in any of the photos.. whee does this tube start and end? I have pulled the sensor out of the dash on both cars, cleaned them out and plugged them back in and put them back in the dash. but I have seen no tubes. Does it just go to the general location under the sensor?

 

[Rmac58]

It may be just a link between two hard lines, attached is the FSM on the sensor, maybe that pic will help.

 

[sethwm2]

It may be just a link between two hard lines, attached is the FSM on the sensor, maybe that pic will help.

Ahhhh... Okay, so I am guessing that the white plastic tube connector has dropped deep down into the dash a long time ago. Because I have pulled the temp sensor out of the dash a few times and I had no idea that plastic air nipple was there around the sensor..

You think this would still be connected to the end of the foam tube and maybe I could retrieve it? or am I going to have to get new ones?

 

[sethwm2]

Also, would this FSM apply to my 81 and 85?

 

[FratBoy]

I replaced this tube once with a section of pipe insulation with the opening glued shut.

Works great, and looks kinda like the OEM.

And yes, you CCU's problems controlling the temperature were probably related to not getting airflow over the sensor due to a broken tube (assuming everything else was working).

FB

 

[preese47]

Is air somehow pulled across the temp sensor?

 

[Rmac58]

Also, would this FSM apply to my 81 and 85?

Sorry for the tardy response, more than likely, yet there were many changes made in 1985.

preese47, the fsm only states the sensor "feels" the temp, but there is a foam tube that must be in place, so bottom line, not sure.

 

[uberwasser]

Is air somehow pulled across the temp sensor?

The way it's configured, I'd say yes. The foam tube is connected to a portion of the climate control air box I believe. When the blower fan "blows" it pushes are out of the vents. This creates a vacuum inside the box. This causes air to be drawn through the foam tube and as a result across the sensor.

When the foam tube is missing, air is instead just drawn in from behind the dash, and it doesn't pass over the sensor in that route. Therefore the sensor doesn't get a flow of air and so it doesn't read cabin temp correctly. This leads to unexpected and inappropriate function of the automatic temp control

 

[preese47]

THanks. As I suspected. What if the temp sensor if bad, what would the symptoms be?

Pat

 

[Noah Way]

The 'need' for heat is determined by the amount of resistance measured at the sensor. The hotter the sensor, the more resistance, the less heat is called for. Unplug the contact (maximum resistance) and you won't get any heat (in my 280e there's another sensor in the heater core). Also corrosion on the contacts creates resistance. Intermittent heat can be the result of this.