Another Heater Question
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Junior User
Joined: Jan 2006
Posts: 93
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From: Medford, Oregon
Another Heater Question
I've been reading through the threads about heating issues. I have an aftermarket gauge which ranges from 100-240 F and it doesn't read anything till I stop and it sets for a couple minutes then it raises to 160* or so. As i start it up again the needle rests back down. Is this unusual? I have read many threads where people actually get readings as they drive.
The other issue is my heater blows air but it's only about 50* or so. It sucks when its 7* outside. I'm not sure if these issues are related, but I am wondering if it is the heater core and/or the thermostat. Is this the correct assumption? I have checked for blockage in the vents and cowl and flapper function inside the cab.
My truck is an 86 F150 with no A/C and I have never checked the thermo or core since owning it for 2.5 years. Thanks.
The other issue is my heater blows air but it's only about 50* or so. It sucks when its 7* outside. I'm not sure if these issues are related, but I am wondering if it is the heater core and/or the thermostat. Is this the correct assumption? I have checked for blockage in the vents and cowl and flapper function inside the cab.
My truck is an 86 F150 with no A/C and I have never checked the thermo or core since owning it for 2.5 years. Thanks.
Elder User
Joined: Sep 2003
Posts: 926
Likes: 3
From: SE, Michigan
Where do you have the sending unit at on the engine for your after market temperature gauge? I put mine at the out let of the cylinder head next to the thermostat. That is going to be the spot where you have the hottest coolant as it is leaving the engine and going to the radiator. You can see it in the picture below that where I put mine when I rebuilt my 300. My water temp gauge goes from 100 to 250 and while at operating temp it will go between 180 and 195. Sounds like you could have a thermostat that is stuck open and a clogged heater core. Change the thermostat and flush the coolant system and go from there.
https://www.ford-trucks.com/user_gal...126945&width=0
https://www.ford-trucks.com/user_gal...122210&width=0
https://www.ford-trucks.com/user_gal...126945&width=0
https://www.ford-trucks.com/user_gal...122210&width=0
Thread Starter
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Junior User
Joined: Jan 2006
Posts: 93
Likes: 0
From: Medford, Oregon
Looking at your pictures mine is in the exact same place as yours. In the next couple of days I should be able to get the waterpump off and check the thermostat. I am hoping tomorrow to check out the heater core. Thanks for the input, at least this gives me a starting point. Happy Holidays
You don`t remove the water pump to get to the thermostat.
...brrrrrrr.
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