I have been having heating issues so I did a little research here and figured I'd start by checking out my heater core for it being clogged. I disconnected both line at the fire wall and the one on top of the engine ( it's the heater hose line closest to the driver. I then blew thru the hose ( into the heater core) and got a small amount of fluid out the other hole (closest to passenger door) I then took that same hose and hooked it up to the other side and blew thru it (back blowing) and could not force any air thru.

Does this mean a clogged core? The air pressure I used was by mouth pressure so is there anyway to unclog this thing or do start removing the heater core?

Thanks,

Gerald

 

back flush the core with water hook a garden hose to the outlet hose of the heater core. First you should try and diagnos the issue . does yor engine heat up to normal temp in the appropriate time. Is your t-stat working. is your blower fan working. you need to give us more info and then we can help

 

I should have mentioned that the truck has no actual over heating issues and the blower motor works fine. I pretty much knew it was one of two things..heater core or blend door.

Is there a connection that I can buy that hooks a gardern hose to the heater hose line?

 

it could have a stuck open thermostat . if that was the case the truck would not overheat however the heat would not work

the blenddoor problem would divert air in areas it was not suppose to .so if you turn the heat on toward your feet and it blows air to your feet the blend door is probably ok. it is never a bad idea to backflush you core and change the heater hoses anyways.

 

also it helps a lot to fill out your signature so that we know what truck you have what engine where you are located( so we have an idea of the temp in your location) put down as much info as possible about you truck thx

 

I have not been on this forum for years but I am on others. I have noticed that if you fill out your signature and try to read the post and respond to the suggestions people will help you , but if you dont fill out our signature and respond to peoples post. they assume you dont realy care and will not try and help you as much

 

I've been on forums for years also. I should've already filled this out but haven't. I just assumed that since I was in the right forum (97-2003) that it was basically a fore gone conclusion that I had one of these trucks. Sorry for the assuming. I should have known better.

On the blend door deal I thought it merged the hot and cold air together. I didn't know that it was mainly the directional door. Does it do both?

Also on the thermostat stuck open issue it has been my experience that even when a thermostat is totally removed that a heater will still throw out relatively warm air cause the water temp in an engine is still hot thermostat or no thermostat. The only time I've had issue with a heater and NO thermostat at all is when it gets really cold outside.

Thanks for the tips and I appreciate your response.

BTW I do care and I will always help out in return when I can.

Gerald Harmon
2001 F150 Supercrew 4X4
Valley, Al.

 

I am not positive about the blend door question so I wouldn't answer it .I am sure someone will chime in with the answer. I know in my truck if i took the thermostat out i would get no heat. but I am sure each truck and motor is a little different

iced a lot of people post suggestions right away to pull your waterpump and rad and have them rebuilt. I think that is not the way to go . when diagnosing these issues I usually start with the easy and most inexpensive suggestions. that is why i mentioned. the backflushing and t-stat first I also would only use a motorcraftt-astat. however if you are sure the t-stat if fine i would replace the heater hoses and backflush the core. if that doesn;t work someone else will chime in and help you figure out if it is the blenddoor or the core ...best of luck

 

Try switching your temp **** with the fan speed ****. Internal stripping of the **** is one of the most common causes of no heat.

 

the blend door is a motor operated door that mixes hot and cold air to get the right temp. it has nothing to do with air flow, only temp mixing. if you cant heat up the cab, you need to see if the hoses are hot into and out of the heater core, and if the temp **** is moving the shaft, and if the door is actually moving. you can see the motor above the transmission hump, under the radio. ------- where the air goes is controlled by 3-4 other doors that are vacuum operated. the **** on the dash moves to defrost, vent, panel, and floor. vacuum cylinders are actuated to move other doors that direct the air up or down. if you loose vacuum , the default is that air goes to the defroster. the air flow has nothing to do with the motor operated blend door.