Discussion
I took my V8 97 Esprit to the garage recently ot have the heatign looked at, as there was none. It seems that some bright spark disconnected much of the hosing some time back. This garage managed to direct heat to the car but only to the front window vents, and while this is hot it still blows very cold air out of the binnacle etc.
I was wondering if anything could tell me what the standard heatign controls should do, and also whether the hot air should be coming out of the binnacle as well?
Thanks ever so much lads!!
Mark
I was wondering if anything could tell me what the standard heatign controls should do, and also whether the hot air should be coming out of the binnacle as well?
Thanks ever so much lads!!
Mark
I remember seeing that someone found a way to mod the controls/hoses etc so that it works like a normal system and allows you to direct warm or cooled air to all vents. I, for one, would love to get that working. Anyone have any suggestions?
John
94 S4
http://skynetworks.gotdns.com
John
94 S4
http://skynetworks.gotdns.com
I once drove an Europa from TX to CA through a snow storm in Central Texas. There seemed to be a permanent vent right over the gas pedal. I found the best approach was to put on 2 pairs of thermal socks and a plastic bag over that. Couldn't drive the car with shoes on anyway.
Dr.Hess
Dr.Hess
This is from one of my previous posts on HVAC from a year or 2 ago to the turbo list when someone was having heater problems. A heater is a must in the frozen north of Minnesota. KFM was going to edit, clip, and paste it into the EFF when he had a chance.
Okay I will try and explain the heater controls and function.
The right knob controls the air distribution. It controls a series of flaps to divert air to the correct vents. Full clockwise of this knob
will recirculate cabin air this is handy if going for max A/C cooling. As you move this knob closer to the 1 o'clock position the external air flap opens until full outside air is drawn in. These positions are used in the A/C mode or for straight cabin air exchange and air is directed through all dash vents. As you move the knob to the 11 o'clock position the flaps will close the two dash vents closest to the center backbone, it re-routes the air flow through the heater core instead of A/C core and the air flow will be diverted to the footwell tube ducts and a touch to the front windscreen vents. As you turn the knob towards full counter clockwise more of the air
flow will be diverted from the footwells to the windscreen till all of the air flow is directed to the windscreen defroster. The two small center knobs you know about already the A/C and fan speed.
The left knob is temperature control for the heater core, full clockwise the core is not open to the hot water. Full counter clockwise and it's full heater flow of hot water. A cable connected the temperature knob (left knob) attaches to the water flow valve to control coolant flow through the heater core.
The right knob is connected to a control cam that rotates to press down two plungers on air valves that the vacumm lines are attached to with a variety of T's and rubber elbows. The left air valve by regulating the amount of vacumm, controls the air intake flap actuator mounted on the blower box under the front bonnet. The right air valve controls the mode flap actuator that diverts air through either the heater core or A/C and also enables/disables the two vents closest the backbone. A steel rod connected to the cam controls the air flow between the footwell
plastic tube ducts and the windscreen vents. The two outside dash vents should be closed off with the thumbwheels when heating or defrosting as they continue to pump cold air as they bypass the
heater core. At no time will they ever pump warm air. It is not nessesary to close off the two center dash vents with the thumbwheels as when the heat is on they will be automatically closed.
Also a vac lines and a T are in cars with a mechanical vac pump are under the left tank cover in the engine compartment.
The Vac valves are found right behind the stereo pod. and the black hard PVC vac lines for USA cars are to left of the center console or center tunnel under the dash. Sometimes these get loose or disconnected and will disable the heater control. The vac valves can also move in the saddle clamps and cause the heater actuator flaps to not move in the correct position for heating as the cams will not engage the plunger on the valves. A movement of the valves in the saddle clamp of even 1/16th or 1/8th of an inch can cause these valves to not operate.
Hope this helps as this is as detailed as it gets.
Not a very good A/C or heater design but I don't think anyone looking at car magazines as a youth said "One day I'm gonna get me one those cars with a really neat HVAC system".
Calvin 90 SE
Okay I will try and explain the heater controls and function.
The right knob controls the air distribution. It controls a series of flaps to divert air to the correct vents. Full clockwise of this knob
will recirculate cabin air this is handy if going for max A/C cooling. As you move this knob closer to the 1 o'clock position the external air flap opens until full outside air is drawn in. These positions are used in the A/C mode or for straight cabin air exchange and air is directed through all dash vents. As you move the knob to the 11 o'clock position the flaps will close the two dash vents closest to the center backbone, it re-routes the air flow through the heater core instead of A/C core and the air flow will be diverted to the footwell tube ducts and a touch to the front windscreen vents. As you turn the knob towards full counter clockwise more of the air
flow will be diverted from the footwells to the windscreen till all of the air flow is directed to the windscreen defroster. The two small center knobs you know about already the A/C and fan speed.
The left knob is temperature control for the heater core, full clockwise the core is not open to the hot water. Full counter clockwise and it's full heater flow of hot water. A cable connected the temperature knob (left knob) attaches to the water flow valve to control coolant flow through the heater core.
The right knob is connected to a control cam that rotates to press down two plungers on air valves that the vacumm lines are attached to with a variety of T's and rubber elbows. The left air valve by regulating the amount of vacumm, controls the air intake flap actuator mounted on the blower box under the front bonnet. The right air valve controls the mode flap actuator that diverts air through either the heater core or A/C and also enables/disables the two vents closest the backbone. A steel rod connected to the cam controls the air flow between the footwell
plastic tube ducts and the windscreen vents. The two outside dash vents should be closed off with the thumbwheels when heating or defrosting as they continue to pump cold air as they bypass the
heater core. At no time will they ever pump warm air. It is not nessesary to close off the two center dash vents with the thumbwheels as when the heat is on they will be automatically closed.
Also a vac lines and a T are in cars with a mechanical vac pump are under the left tank cover in the engine compartment.
The Vac valves are found right behind the stereo pod. and the black hard PVC vac lines for USA cars are to left of the center console or center tunnel under the dash. Sometimes these get loose or disconnected and will disable the heater control. The vac valves can also move in the saddle clamps and cause the heater actuator flaps to not move in the correct position for heating as the cams will not engage the plunger on the valves. A movement of the valves in the saddle clamp of even 1/16th or 1/8th of an inch can cause these valves to not operate.
Hope this helps as this is as detailed as it gets.
Not a very good A/C or heater design but I don't think anyone looking at car magazines as a youth said "One day I'm gonna get me one those cars with a really neat HVAC system".
Calvin 90 SE
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