Question about 1994 Eagle Vision

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"heater head" failure

Heater head repeatedly failed. default is high blower and high heat from defrost vents. used parts also fail. solution?

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You may need to replace the hevac modual located behind the glove box ,

Posted on Apr 04, 2014

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2 Answers

96 geo heater blower does not work


Replace the blower motor. The brushes wear out. Any autoparts store has them. About 100 dollars

Oct 04, 2015 | 1996 Geo Metro

2 Answers

Side windows on passenger side fog up. Not on driver's side, only on passenger.


so find out which vent is dead,?
before 5 gallon LYSOL flush an a week long GAG !
make sure first never to use RECRIC, when wanting to defog.
and is the A/C running in dash defrost mode (compressor main shaft spins)

if a vent is dead, its a bad damper valve, (not saying a part, a function)
the book is free, you can read it, HVAC. see venting and dampers.
its very simple in concept, a fan, a damper and dry air. hot.
the heater core makes heat the non recirc, damage gives you fresh air, the A/C makes that air dry. and the dampers the supply all vents work work.
so make sure the controls are set right,
then see if the upper vents all blow, with hand waved on them.
see? that is easy, and not reporting a dead vent ,makes help harder.
the FSM is on line, ill look for you.
but first HVAC 101
  1. does blower work on high?
  2. does the recirc turn to fresh are,and you get fresh air with blower off moving, at all top vents. y/n
  3. do you have full heat? 180F + engine heat (scan tool shows this as ECT)
  4. do all vents top work , blower on?
  5. is the A/C compressor working in A/c mode (cold) and Defrost?
  6. more... below.
Rule one, dont work in dash until air bags are DEFEATED (injury) (pull battery neg lug, and wait 1hour)

got fsm page open, ill state some facts needed to fix this.

first ill prove the dash system does not need total dismantle
for all jobs. Does NOT.
Air /mix blend door
Single Zone/Dual Zone Driver's Side(FSM)
  1. Disconnect and isolate the negative battery cable.
  2. Remove the instrument panel silencer from the driver side of the instrument panel.
  3. Remove the three screws that secure the blend door actuator to the driver side of the HVAC air distribution housing .
  4. Remove the blend door actuator from the air distribution housing and disconnect the HVAC wire harness connector from the actuator.
  5. Remove the blend door actuator from the vehicle.

next page, is blend door 2, type.
has vacuum servos.
we move the controls and make sure all servo vacuum motors
work

this car has driver side and passenger side seperate blend doors.
so,,, we are getting close here>
?
if the defroster fails,(seems not) then that is electric motor drive
and very hard to test . (if not door jam)

in any case, we need to know what part is failing,
if the passenger blend is dead.
seen below,
we then must find out why
1: just stuck.
2: servo actuator failure
3: controls to #2 above bad, or connections to each.


25414659-fivq5xl3wt5ieutt12itpjng-5-0.jpg
login to alldata.com see HVAC chapter, read how it works and the tests.

Feb 11, 2015 | 2001 Jeep Grand Cherokee

1 Answer

1996 Montero Heater Blower not working


I assume your heater setting is electric control, if so either your defrost and floor heat switch failed or wire problem. For the air not hot, check the heat control valve on the top of the hose it should be in front of the firewall. I don't know your car is using mechanic valve or electric control valve. Anyway check there first. Good luck.

Nov 24, 2013 | 1996 Mitsubishi Montero

1 Answer

Have 1985 dodge ramcharger royal se 5.2L 318. A 30amp toggle switch had been wired to control the heaters blower motor and thats how I get my heat which is constantly on high. What part or parts should I...


Hello from cold Kentucky.
The system uses a fan switch, resistor, and probably a high blower relay.
In the high position, the switch powers a relay that powers the blower motor. Any lower speed goes thru the resistor.
The resistor is on the firewall or under the dash depending on if the truck has air cond.
You can look up a blower resistor on the auto parts websites to get a visual.

Dec 22, 2012 | Cars & Trucks

1 Answer

My chevy 93 cavalier blows heat but not through the defroster vents


not sure on model but it sounds like the selector wires have come off these are the wires conected to the blower selecting where the heat comes out from eg to vents foot well or windscreen or the little loops that the go around have snaped or come off hope this helps

Sep 27, 2012 | Cars & Trucks

1 Answer

Heat AND AC ONLY COME OUT DEFROSTER NOT VENTS


you probably have a vacuum leak from the engine or vacuum storage canister to the heater/a/c control head. Defrost is default mode required by law when system fails.

Jul 28, 2011 | 1998 Ford Explorer

1 Answer

A/c fan only on high,fan goes from dash vents to floor od deforst


replace the a/c blower motor resister. If it fails again, you will have to replace blower motor.

For the air blowing out defrost (failure mode), you probably have the vacuum harness on the back of the control head not fitting tightly, causing a vacuum leak. Use tie straps to hold it tight.

I have a picture but it's 2.3 mb. Can't post here.

email address is needed to send to you.

Jun 28, 2011 | 2006 Mercury Grand Marquis

3 Answers

No hot air from vents and defroster. What causes this?


possible block in the heater core, or a blower motor failure, check the operation of the blower motor before checking the heater core as it is a much more labor intensive job

Mar 01, 2011 | 1998 Mercury Tracer

1 Answer

My 1996 Jimmy had the blower motor and heater core replaced and now the air will only blow out of the top defrost vent no matter what vent is selected for A/C or Heat. The vents were working before he...


If I remember correctly the mode door is vacuum operated. Check to make sure that there is vacuum to the control head. If not is is possible you knocked the vacuum line off when replacing the heater core. The default position for a vacuum controlled mode door on just about every vehicle is the defrost position. This is so if there is a failure in the system you will at least still have a clear windshield to see through.

Jan 21, 2011 | 1996 GMC Jimmy

2 Answers

Blower motor vent selection switch not working


the hvac selector switch in the dash may be the problem.You need to remove the switch and look at the connector on the back of switch,see if there are any burnt wires at the connector or switch.It's all electronic and the switches have been known to burn out on this and other model.

May 26, 2009 | 1998 Buick LeSabre

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