Question about 1991 Ford F150

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Truck has no heat even after i changed thermostat

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I'm not tryting to be a wise guy.
1) did you put the thermostat in the rite direction?
2) is the coolant level full in the radiator?
3) if so I would check that the top radiator hose is getting firm while the truck is running, try squeezing it and then letting go to see if you can feel the coolant flowing through it. This will let you know if the water pump is operating properly or not. also you can remove the radiator cap to see if the coolant is circulating, ( take care not to open the radiator cap when the truck is to hot )
4) check the heater core to see if it is plugged.
5) If you have one of those flush kits installed on your heater hose remove it and make sure that it is not plugged or being blocked by something, I have only ever seen this happen once in my career but it's worth checking.

Posted on Oct 14, 2008

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It's very possible that the heater core may be clogged. With the engine warmed up try holding each of the hoses going to the heater and see if both are hot. Unless there is a mechanical shutoff valve inline, both should be equally warm to the touch if there is water flow. Your options are to try to backward flush the core, try to dissolve the rust or debris clogging it with a radiator solution purchased at the store of your choice, remove it and take it to a professional radiator repair shop or replace it with a used or new core.
If both lines going to the heater are hot to the touch, you may have an issue with the louver to allow the air though the heater housing. You will have to check any linkage cables or vacuum lines going to the dashboard control panel to see if they are broken.

Posted on Oct 14, 2008

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SOURCE: truck is over heating. changed thermostat. still

CHECK COOLANT FAN CLUTCH.IF FAN FEEL WOBBLY FAN CLUTCH BEARING BAD.IF FAN HAS RESISTANCE WHEN TURN IT WITH HANDS FAN CLUTCH IS GOOD.THE RADIATOR CORES COULD BE STOPPED UP.BAD RADIATOR PRESSURE CAP.FRONT GRILLE IS RESTRICTED WITH DEBRIS CUTTING OFF AIR FLOW.

Posted on Apr 05, 2010

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Posted on Jan 02, 2017

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