Alex_n/a

iTrader: (1)

ok so i've been searching and found some help but not all. my problem is when i turn the heater on it blows cold air or ambient to be technical about it. the blower seems to be fine as i can control the speed of the air coming out the vents. i can also switch between the settings (feet, feet and face, defrost) but when i move the cold to hot setting nothing changes. i burped my cooling system by turning on the car and filling it up i also had the heater all the way on. i checked both the inlet and outlet hoses in the fire wall and they are not warm or hot when they top radiator hose is hot. i do know that if one is hot not the other it means something is blocking the heater core. and if they are both are cold it can be the logicon or heater control valve (not exactly sure what or where that is)

so basically i'm leaning towards my logicon or heater control valve. what do you guys think and how should i fix it. should i swap logicons with someone and see what happens then try switching the control valve?

Osirus9

iTrader: (10)

The logicons on FCs are just famously unreliable, and I know I've had many problems with mine. In fact mine is broken AGAIN right now and I need to swap it with another one in my garage...

Anyway, if you have a friend with a working heater, then the first thing I would do is try swapping logicons and see if that fixes your problem. If that doesn't work then go after the control valve.

RotaryEvolution

iTrader: (30)

both hoses being cold does not mean that there isn't a blockage in the heater core.

move the temp slider while making sure the blend door motor arm is working properly(it is right above the gas pedal on the heater box above the tranny). if it is moving properly then your heater core is plugged up or you have air in the system still.

Alex_n/a

iTrader: (1)

thanks for the fast response. i'm going to see who has a working heater.

Alex_n/a

iTrader: (1)

i'm going to check that too. and just to make sure you didn't typo if the the blend door motor arm IS moving then my heater core is pluged. so i don't want it to move right?

clokker

iTrader: (2)

Not necessarily.
The water flow control valve may be bad...in fact, much more likely than a clogged core.

RotaryEvolution

iTrader: (30)

it should move when you move the heat/cold slider, i have had one or two actuators that got bound up and weren't moving at all until i gave them a nudge.

Alex_n/a

iTrader: (1)

where is the heater control valve. I'm working on the car right now but don't see it. Is it inside the black box behind the glove box. I can hear something moving behind the dash when I move the tempeture control. And I can see something moving right behind the vents when I change settings on where the heat comes from. Thanks for the help btw.

philly101

it might just be off track

ericgrau

iTrader: (1)

If you hear something moving when you slide the slider then your logicon works and there's at least power to the air control doors. If the heater core failed and it's not leaking coolant I would think it would have clogged up and failed gradually rather than all at once.

Alex_n/a

iTrader: (1)

so i found this two videos very helpful in case someone in the future runs into this problem.

http://www.youtube.com/watch?v=dcL_0TWeZJY

http://www.youtube.com/watch?v=bmmn4ON_t0c

so i'm going to flush my heater core now. hopefully it works.

thanks again.

Alex_n/a

iTrader: (1)

sweet my heater works now =) just a little clogged, it hadn't ran in 4 years so i shouldn't be surprised.

clokker

iTrader: (2)

Good.