Heater problems HELP!
Thread Starter
Junior Member
Joined: Feb 2016
Posts: 10
Likes: 0
I agree with flow, - either the impeller in the pump or a plugged or partially plugged core. Partially would explain it.
Did you know you started two identical threads RavenS ? Guess I'll let others know so they don't waste their time posting in the other for yuh. I'll redirect them.
Did you know you started two identical threads RavenS ? Guess I'll let others know so they don't waste their time posting in the other for yuh. I'll redirect them.
Thread Starter
Junior Member
Joined: Feb 2016
Posts: 10
Likes: 0
Hi. I have a major or maybe minor problem. I have changed the actuator doir, checked heater core and still have a problem. I have heat for about 1 minute then it turns really cold. I can not find any help on this. It is a 1999 F150. It has vacuum lines and is nondigital. We have tried everything. At first it would only give a little heat on defrost then it finally gives some heat on the face. But it ONLY gives heat for about 1 minute then nothing but cold. I can cut it off wait a while then i have heat again but only for a minute. Help please. ANY ideas????? It is a 5.4L engine. Touched both hoses in engine compartment. They are hot. Don't have a regular radiator cap so I am a little confused with the set up. We changed the actuator door. Have no special tools like temp gages
Senior Member
Joined: Sep 2013
Posts: 1,267
Likes: 85
From: Behind You
If both hoses connected to the heater core are hot. It's either the thermostat is not closing properly or your not using the recomended mixture of Coolant & water. It will not blow hot air if your using pure water.
