heating woes

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  #1  
Old 11-11-08, 02:08 PM
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heating woes

I have 1998 ford xlt 4.8 v-8

Yesterday I drove to the mall 25 minutes away, heater going along just fine.

Stop in front of store and the misses goes in and exchanges a few items. Truck in park, all by itself it decides its time to blow cold instead of hot, I did not change any temp settings nothing, just started to blow cold.

Turn truck off wait for speedy to get back, when she does, start truck go down the road, heat is back to blowing hot again.

This truck has been doing this weird $h!t for a while now.

Has anyone else had a similar experience?
 
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Old 11-11-08, 03:28 PM
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Sounds like a blend door actuator. It's a little valve in the air ducts that allows heat off the heater core to enter the system.

Most vehicles you gotta remove the entire dashboard to replace, but you might be lucky to replace it from underneith.

Before tackling that, I would have your coolant system/heater core flushed.
 
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Old 11-11-08, 04:06 PM
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door

I don't think that this door that you are talking, is going to open and close whenever it wants too, things just don't go bad like that.

I have in the past put block seal in the radiator to fix a leak in the head gasket, real bad leak smoke out the tail pipe the whole nine yards. It was going to cost me 700 to fix. I have been running it since, I guess this might be the trade off.

 
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Old 11-11-08, 04:32 PM
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I don't think that this door that you are talking, is going to open and close whenever it wants too, things just don't go bad like that.
Actually, it can. Same thing happened to my wifes old Dodge Stratus. Sometimes, the control panel itself is acting up and it's telling the door to open and close randomly.
 
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Old 11-11-08, 05:56 PM
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Is coolant level topped off?

You may have to learn all what YOUR coolant system consists of, as you may have some inline device or routing device that can stop or divert flow even from going into the heater core. Once you found such a device, then you could speculate on why say some electrical or vacuum actuated device is not pehaps receiving the electrical or vacuum signal, sometimes.

I don't know. I'm, just saying. I'd want to see a map of your entire cooling system to get a better handle on maybes.
 
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