No Heat Stumper
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New User
Joined: Jan 2003
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From: Westfield USA
No Heat Stumper
This one is a real puzzle. I hope you fellows can help.
I have an 89 f150 300 and cannot get very little heat in the cab. I've changed the pump, heater core, flushed the cooling system 4 hours, and made sure the vent door and the mixing door were working and sealing properly. I changed the thermostat twiced. The first thermostat was a more expensive Robert Shaw thermostat, I felt it reacted slowly so I put a standard 195 deg thermostat in. I also replaced the housing that holds the thermostat, I thought maybe coolant was leaking past the thermostat.
This I really don't understand. The heater hose going to the heater core from the pump is cold, and the heater hose from the core to the thermostat housing is hot.
Please help, thanks in advance.
I have an 89 f150 300 and cannot get very little heat in the cab. I've changed the pump, heater core, flushed the cooling system 4 hours, and made sure the vent door and the mixing door were working and sealing properly. I changed the thermostat twiced. The first thermostat was a more expensive Robert Shaw thermostat, I felt it reacted slowly so I put a standard 195 deg thermostat in. I also replaced the housing that holds the thermostat, I thought maybe coolant was leaking past the thermostat.
This I really don't understand. The heater hose going to the heater core from the pump is cold, and the heater hose from the core to the thermostat housing is hot.
Please help, thanks in advance.
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Joined: Dec 1999
Posts: 1,903
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From: Copley, OH
No Heat Stumper
Plugged heater core?
Pull both hoses at the engine end and back flush the heater core. I'll bet it's packed full of crud.
NEVER MIND. I just saw that you changed the core.
Pull the pump to core hose at the core end and put it into a bucket. Start the engine and see if the pump is sending water through the hose. If the pump is working, the problem is in the hoses or the core.
Pull both hoses at the engine end and back flush the heater core. I'll bet it's packed full of crud.
NEVER MIND. I just saw that you changed the core.
Pull the pump to core hose at the core end and put it into a bucket. Start the engine and see if the pump is sending water through the hose. If the pump is working, the problem is in the hoses or the core.
Last edited by StrangeRanger; Feb 9, 2003 at 10:36 AM.
Senior User
Joined: Feb 2000
Posts: 369
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No Heat Stumper
If the pump does work (as was previously suggested), check to make sure there are not air pockets in the hoses. I had fits with a '93 Continental last year. Turns out an air pocket in one of the heater hoses prevented flow. I solved it by filling up the fluids with the heater hose disconnected until the water started a steady flow, then jammed it on. Messy, but it worked.
Freshman User
Joined: Jan 2003
Posts: 41
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No Heat Stumper
I have a similar problem but have not yet swapped out the thermostat. Do you suggest starting with a 195 degree or higher/lower? Hopefully that will fix my problem if not, I will have to do what you did and start taking the whole thing apart.
-Jon
-Jon
Elder User
Joined: Apr 2002
Posts: 541
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From: Victoria, Texas
No Heat Stumper
Stick with the 195* thermostat, that's what the computer is designed for. You would probably be ok with a 180 if you lived in Arizona or something, but I'm in South Texas and a 195 is just fine.
Mountain Pass
Joined: Feb 2003
Posts: 136
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No Heat Stumper
I agree with Bob. Check Heater Control Valve. There should be a vacuum hose going to it. And a little lever to cycle, try and cycle it...it may be stuck or getting no vacuum.
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New User
Joined: Jan 2003
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From: Westfield USA
No Heat Stumper
I took Strangerangers advice and pulled the heater hose from the thermostat to the heater core to let it pump into a bucket. There was no flow. I must have one heck of an air pocket. The engine does not overheat? It has been very cold in my area, maybe when it gets warmer I can get enough flow to get the air pocket out? I"ve idiled the engine for long periods of time with the radiator cap off but there still must be an air lock. Does anyone have a sure fire way to get the air out?
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Joined: Dec 2002
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From: Norwalk
No Heat Stumper
For what its worth, if you have a pressure radiator/cooling system leak detector, try to apply pressure through the radiator to force the coolant along with the air from the disconnected hose.
You can also check to see if the coolant is actually flowing through the the heater, by connecting the inlet hose to the core, while the outlet hose is disconnected and applying pressure, this will bleed any air out of the heater core or indicate a blockage.
Good luck
You can also check to see if the coolant is actually flowing through the the heater, by connecting the inlet hose to the core, while the outlet hose is disconnected and applying pressure, this will bleed any air out of the heater core or indicate a blockage.
Good luck
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New User
Joined: Jan 2003
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From: Westfield USA
No Heat Stumper
I Have Heat. I am so excited.
I took Incommunicato's advice and pressurized the radiator, bleeding the heater hose into a bucket. Thanks so much for all your help guys. 
I took Incommunicato's advice and pressurized the radiator, bleeding the heater hose into a bucket. Thanks so much for all your help guys.
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