Heater not heating well.
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Senior User
Joined: Dec 2008
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From: Mckinleyville, CA
Heater not heating well.
So, I have a 92 f250 5.8 with an a/t. It has 138xxx miles and the last two winters have sucked, the heater blows hard. It just doesn't get very hot, takes forever to heat even my little regular cab. You can put your hand on the vent and it's warm but doesn't make your hand uncomfortably hot...even with the engine fully heated up towing 5k lbs up a steep grade on the highway going 60. How hot are these heaters supposed to get? I'm thinking of taking a meat thermometer and testing to see how hot it reads, I read up somewhere and it said the temp in the vent should be around 140 degrees. My wifes 4 cylinder roasts your hand to the point you think you would burn it if you left it there. Advice?
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Senior User
Joined: Dec 2008
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From: Mckinleyville, CA
Had it flushed professionally last year. Its my work truck and I couldn't afford the downtime to do it myself...it was already getting the oil changed. Coolant is black though...Thinking my heater hoses are old. I found another thread from a bit back just now, they said the blend/diverter door or a restriction somewhere. I'll get out and check the temp coming out of the vents tomorrow as well as if my heater hoses are both hot or not. Can I check the heater core and/or vents behind the glove box on my model of truck?
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Joined: Aug 2009
Posts: 142
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From: Wylie,TX
I had the same heater issue in my truck ('89 4.9 M5OD).
Amoungst the several things I did today I tore into the heater core area and played with the temp control cable. The PO must have done something. Cold is hot and hot is cold. There's probably a connection between this and the blend door / vacuum lines.
I "velcro'd" the blend door (vacuum actuator in engine compartment) so it was closed. Probably could have used something else but I wanted to have heat.
Now I have great heat!
When it get's warmer I'll replace vacuum lines and fix it correctly.
For now - I needed heat.
And the heat is there now. Yeah!
/Ricache
Amoungst the several things I did today I tore into the heater core area and played with the temp control cable. The PO must have done something. Cold is hot and hot is cold. There's probably a connection between this and the blend door / vacuum lines.
I "velcro'd" the blend door (vacuum actuator in engine compartment) so it was closed. Probably could have used something else but I wanted to have heat.
Now I have great heat!
When it get's warmer I'll replace vacuum lines and fix it correctly.
For now - I needed heat.
And the heat is there now. Yeah!
/Ricache
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Post Fiend
Joined: Apr 2004
Posts: 6,473
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From: Lafayette, IN
Check both of the heater hoses going to the firewall. With the engine hot, both hoses should also be pretty hot (one may be slightly warmer than the other). If one is hot and the other is not, your heater core is plugged. It would then need to be pulled and back-flushed or replaced.
Jason
Jason
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New User
Joined: Dec 2009
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From: northville
just fixed mine
the guage red warm and no heat. i left the truck runnin and took the right coolant hose off the fire wall. no flo. so with it runnin i put a garden hose to it and back flushed it. it started flowin and the guage reads normal and my heat is good
Postmaster
Joined: Jul 2008
Posts: 2,565
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It may not last. I did that with my old 92 and the heater worked for awhile then quit again. I finally just put in a new heater core and the problem was solved. I wish my old 94 Taurus was that easy to change out the heater core. On that one you have to pull the dash to get the heater core. The old truck only took an hour.
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Bruce_M
1987 - 1996 F150 & Larger F-Series Trucks
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Dec 13, 2008 03:53 PM
