Heater isnt working right. HELP
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Heater isnt working right. HELP
My heater in my 92 f-150 is startin not to work. When my truck is warmed up i go to turn my heater on and it blows hot air out for 2 seconds then goes to cold. What could this be?
Postmaster
Joined: Apr 2000
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From: SD
Sounds like the heater core is plugged. Are both heater hoses warm when engine is warm? same temp as rad hose? If not, try to flush the heater core - or just replace it. Theres a cover behind the glove box. Remove the cover and core will slide out (with hoses off). Let us know what you find.
Marty
Marty
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Joined: Jul 2003
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From: Alvin, Texas.
I'd just replace that 13 year old heater core anyway.
The core can be plugged even if the heater hoses are warm. If there is loads of crud in the core, all the fluids will do is circulate away from the core and still keep the hoses warm.
My 94 Ranger has been underwhelming in terms of heat output. Changed the factory t-stat, needed to (and did) change the gauge sender (PITA), but when I flushed the coolant last December (03), it was choco brownish. Time for my next project...
The core can be plugged even if the heater hoses are warm. If there is loads of crud in the core, all the fluids will do is circulate away from the core and still keep the hoses warm.
My 94 Ranger has been underwhelming in terms of heat output. Changed the factory t-stat, needed to (and did) change the gauge sender (PITA), but when I flushed the coolant last December (03), it was choco brownish. Time for my next project...
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me and my dad are goin to get a new heater core and thermastate today ill let yall know what i find. and also sometimes it takes it a min to actually start blowin the air out of the vents and its not very strong even on high when it does come out. any suggestions there?
Postmaster
Joined: Apr 2000
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From: SD
Are you asking how to replace the heater core?
Behind the glove box is a plastic cover held on by 6-8 screws, remove this cover and you will see the heater core. Remove the hoses off the heater core (engine side of firewall). Then heater core should slide right out and new one will slide right in. A new one can be had at any parts store for about $25 and should take 1-2 hours to replace.
If you use some vice-grips or something similar to pinch the heater hoses closed, you won't loose much coolant...
Marty
Behind the glove box is a plastic cover held on by 6-8 screws, remove this cover and you will see the heater core. Remove the hoses off the heater core (engine side of firewall). Then heater core should slide right out and new one will slide right in. A new one can be had at any parts store for about $25 and should take 1-2 hours to replace.
If you use some vice-grips or something similar to pinch the heater hoses closed, you won't loose much coolant...
Marty
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Elder User
Joined: Dec 2003
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From: New Mexico
A simple thing to check is the coolant level and the pressure holding ability of the radiator cap. Low fluid can cause this and the leaking cap is one way to lose a lot of fluid "invisibly."
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well me and my dad replaced the thermostat first to see what that would do. Just made the truck blow COLDER air. this weekend we r goin to flush out the heater core first and we might go ahead and replace it.
