I have no heat!

[DoC-JoneS]

Not really sure if this is the right place to post this, but after a recent trip to the shop for a siezed A/C Compressor, my heat no longer works. i know it's not the blower motor as when i turn it up to 80 i still get slightly chilled air. vent doesn't produce any better results. anyone have any idea? i really hope it isn't the heater core, i hear thoes are a PITA to get in/out. i'm wondering if it's the heater control switch. ieht that or in a worse case scenario it's a busted heater hose. any help or suggestions would help very much. it's getting cold around here finally and it's getting to be more of an issue.

 

[SHOZ123]

Are the heater hoses hot? Can you get air to move out of the various openings as you go though the EATC selections?

 

[Bizzy]

Also, is your radiator full?

<small>[ November 30, 2003, 10:49 AM: Message edited by: Bizzy ]</small>

 

[autobahnsho]

The heater core is basically a radiator that takes hot water (& antifreeze!) from the engine, then the "blower" is a fan that blows air across it so it gets heated as it comes into the car.

So like they said ^ you need to check that you have fluid in the radiator, when the car is running you can feel the hoses so that you know the water is getting hot, and that your fan is working, along with the EATC. You can even find two smaller sized hoses (maybe metal lines) near the right hand side of the car in the engine compartment going to the firewall (the heater core is barely inside the passenger compartment).

If your fan isn't working you would have probably noticed. If your EATC isn't working right it won't be directing air across the core.. (I believe.)

Good luck!

 

[ckinart]

As far as I know, the only things that can go wrong with your heater core are 1) it can leak (which you should notice with moisture on the floor/carpet) or 2) it can get clogged which would give you no heat, but this typically happens over a prolonged period or time, not all of a sudden.

The fact that you stopped getting heat right after you had the A/C system serviced seems rather suspect, but here's something else you can try: look here for a test procedure you can run on your climate control system. It's possible that you have a blend door issue which is not mixing any heat from the heater core with incoming air.

 

[Bizzy]

ckinart:
It's possible that you have a blend door issue which is not mixing any heat from the heater core with incoming air.

When it's the blend door isn't it typical to get all hot air no matter what the climate control is set to? shrug

 

[ckinart]

Bizzy
When it's the blend door isn't it typical to get all hot air no matter what the climate control is set to? shrug

That is a distinct possibility; I'm really not sure Beth. I just figured that if the blend door actuator were to fail, perhaps it's possible that it could fail in a position that allows no heat into the cabin??

Sorry if I'm not providing useful info. Just figured the EATC self-test is an easy thing to try...

 

[projectSHO89]

Bizzy:

ckinart:
It's possible that you have a blend door issue which is not mixing any heat from the heater core with incoming air.

When it's the blend door isn't it typical to get all hot air no matter what the climate control is set to? shrug

No, not necessarily.

There have been two failure modes associated with BDA failures.

One is where the position sensing element fails. When this happens, the EATC commands the EATC to full hot trying to get a response from the sensor.

The other is a failure of the motor drive mechanism or gears. When these fail, the blend door will be left in whatever was its last position.

Steve

 

[Bizzy]

ckinart:
Sorry if I'm not providing useful info. Just figured the EATC self-test is an easy thing to try...

No, no....you're providing very useful info. Don't get me wrong, I was asking for clarification because I didn't know. All I know is what mine did and man was it ever HOT. *makes me sweat thinking about it*

Thanks for the clarification Steve. thumb

 

[DHMag]

on topic, its possible the Cold Engine Lockout Switch has gone bad or been disconnected for some odd reason. below the outlet/inlet for the hearter core, look for a hard plumbed line, there is a mount tab with mounts it to the rear head. in this hard line, there is a switch with an electrical connector on it. if that went out, good luck, as they are obsolete in new condition.

off topic - it is to my understanding that if there is a blend door malfunction , it will default to defrost. this is true for a loss of vacuum, though im not sure about blend door actuation or the blend door module.

<small>[ December 01, 2003, 11:11 AM: Message edited by: DHMag ]</small>

 

[projectSHO89]

Dale,

The default to defrost is not a function of the blend door, only of the directional controls. It is a different part of the system.

The CELO only prevents the blower fan from operating at higher speeds before the coolant heats up. This feature cuts down on wind chill in the passenger compartment when the engine is first started.

Steve