Blend door - no heat

[MT-2500]

You may have to get the dealer to check it.
Good Luck
MT

[cyclonicblade]

Originally Posted by MT-2500

You may have to get the dealer to check it.
Good Luck
MT

If Vac operated doors check for vac leaks also check for leaves or debri in heater core or ducts dont know if this will help but is first thing I look at in older cars

[haze1956]

Pulled cover tocheck for blockage in fan, all clear, recirc door is sluggish but does reach both open and close positions

I can see A/C core from small rubber access hatch that temp probe wire goes through. Used compressed air to clean core, got some small debris out of vents.

The real problem I have is not knowing what is between the A/C core and the heater Core. I am assuming that is the Blend door location, which may be the casue of my problem. I can't confirm that it is reaching it's stops. I noticed the A/C wasn't working real well this Summer, felt cool but not cold. Now heat is warm but not hot. Seems to indicate I am getting mixed air.

Any idea where I might find a diagram of the Heat-AC system?

And now the cooldown test failure has the lights flashing fot 15 minutes every time I start the van.

Technology is good ? LOL

[haze1956]

Think I have finally found problem,

I have constant outside air entering heating/AC system. This mixes hot air with AC in summer and cold air with heat in winter.

I finally figured this out by taping up the Air intake vents on the hood in front of the windsheild, I then got heat instead of cold air when Van was being driven with controls in heat mode. What little heated air that has been coming out, had been turning cold as soon as vehicle was in motion

Question is what controls air flow entry into the system, A door of some kind I am assuming, but where is it and what controls it.

There is a recirculation door in the passenger foot area, but this opens and closes by its control button yet doesn't seem to affect the intake of outside air.

Anyone familiar with the vehicle AC/Heat system?

[MT-2500]

Here is a link to the best info besides a factory service manual.

http://www.alldata.com/products/diy/index.html

MT

[holdemjunkie]

Replace heater core

[haze1956]

If it were bad, that might be a good idea.

Did you read the previous posts ??