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post #1 of 30 (permalink) Old 02-12-2012, 01:28 AM Thread Starter
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NO HEAT!

ok so i have a problem. I have no heat in my truck, if i keep the blower on low i get some but its barely enough to defrost the windshield. all hoses get hot, radiator gets hot, has a new water pump, heater core, thermostat. the blend door works too. i am completely lost as to what is wrong. it started a year ago when i drained all the water out and put antifreeze in it. since then i dont have heat. if anybody has any other suggestions as to what it could be it would be greatly appreciated. though the winter this year in lower michigan has been fair, no heat still sucks lol!

86 F-250 4X4..7.3 non turbo from an 89.. E injectors and pump turned up.. 4 speed..3.55 gears.. new dual 4" exhaust by diamond eye-- with the muffler > for now!
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post #2 of 30 (permalink) Old 02-12-2012, 01:47 AM
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My 89 doesn't have a real good heater either,but it does eventually get hot,i always thought maybe it was because of the size of the cooling system,but i'm wondering if maybe there's a obstruction in the heater core restricting flow,anyone else have good heat or slow heat.

89 F250 HD 7.3L IDI E4OD TRANNY 4IN" EXHAUST WITH FLOWMASTER 40 SERIES PUMP TURNED UP 1 FLAT SOUP BOWL MOD HOMEMADE AIR INTAKE B&M SHIFTKIT,MANUAL TQ CONV LOCKUP MANUAL GP SWITCH BILLET GRILLE,DRIVING LIGHTS IN BUMPER LED CAB LIGHTS,20% TINTED WINDOWS GOOSENECK AND RECEIVER HITCHES
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post #3 of 30 (permalink) Old 02-12-2012, 06:39 PM
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Are you getting good coolant flow through the heater core? If your heater valve is not opening all the way it won't get the core hot enough to heat the air blowing through it. Pull the return hose off the core to see.

2002 F-350 CC, Shortbed, 4X4, rebuilt 7.3, EBV brake, 4" dual exhaust, B&D compressor wheel, head studs, Gear head performance 6 pos, Banks Big Head, built 4R100 w/triple disc torque conv, Shift kit, 204K, B&W Hitch and 5th wheel companion, Superlift Air Bags, 35 x 12.50 x 17 BFG KM2:

The veiws expressed are purely opinion. I in no way take responsibility for any actions or damage as a result of trying this at home.

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post #4 of 30 (permalink) Old 02-13-2012, 01:10 AM Thread Starter
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everything seems to flowing good. what does the heater valve look like? and is it possible to put the hoses on the core backwards? i didn't know it there was a rhyme or reason to which way they went on. i have noticed that the hoses coming out of the core are still squeezable when hot, shouldn't they be a lil harder to squeeze while its hot?

86 F-250 4X4..7.3 non turbo from an 89.. E injectors and pump turned up.. 4 speed..3.55 gears.. new dual 4" exhaust by diamond eye-- with the muffler > for now!
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post #5 of 30 (permalink) Old 02-13-2012, 02:23 AM
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I would say your function control is working if you are able to switch between defrost, floor ect. But it sound like the heat blend door is not. It should be a vaccuum/ or electronic motor on top of the housing that the heater core is in. This door opens and closes when you switch it between cold and hot. Hope you are able to get heat!

2002 F-350 CC, Shortbed, 4X4, rebuilt 7.3, EBV brake, 4" dual exhaust, B&D compressor wheel, head studs, Gear head performance 6 pos, Banks Big Head, built 4R100 w/triple disc torque conv, Shift kit, 204K, B&W Hitch and 5th wheel companion, Superlift Air Bags, 35 x 12.50 x 17 BFG KM2:

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post #6 of 30 (permalink) Old 02-13-2012, 04:23 PM Thread Starter
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my blend door is cable operated, there is nothing else on top of the heater box. i pulled the blower motor off and could feel the blend door moving and could see it moving with a little bore scope camera deal that my buddy had. let me ask this, would a regular core work in a high output box? i have the high output heater but not 100 percent sure if the core is high output? would a h.o. core only fit in the box or would the regular one fit too?

86 F-250 4X4..7.3 non turbo from an 89.. E injectors and pump turned up.. 4 speed..3.55 gears.. new dual 4" exhaust by diamond eye-- with the muffler > for now!
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post #7 of 30 (permalink) Old 02-13-2012, 08:21 PM
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What about your radiator cap,is the system pressuring,does overflow tank rise and fall with the warming up and cooling down of the engine a unpressurized system wont heat as good,just some more suggestions.

89 F250 HD 7.3L IDI E4OD TRANNY 4IN" EXHAUST WITH FLOWMASTER 40 SERIES PUMP TURNED UP 1 FLAT SOUP BOWL MOD HOMEMADE AIR INTAKE B&M SHIFTKIT,MANUAL TQ CONV LOCKUP MANUAL GP SWITCH BILLET GRILLE,DRIVING LIGHTS IN BUMPER LED CAB LIGHTS,20% TINTED WINDOWS GOOSENECK AND RECEIVER HITCHES
FUEL TANK VENT MOD
MOSTLY HAULIN HAY AND HORSES 24,000lb.GVW TRANNY COOLER WITH FAN
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post #8 of 30 (permalink) Old 02-13-2012, 08:27 PM
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Thought of something else, what about the check ball in the thermostat housing,is it moving freely or plugged,the check ball purges the system of air.

89 F250 HD 7.3L IDI E4OD TRANNY 4IN" EXHAUST WITH FLOWMASTER 40 SERIES PUMP TURNED UP 1 FLAT SOUP BOWL MOD HOMEMADE AIR INTAKE B&M SHIFTKIT,MANUAL TQ CONV LOCKUP MANUAL GP SWITCH BILLET GRILLE,DRIVING LIGHTS IN BUMPER LED CAB LIGHTS,20% TINTED WINDOWS GOOSENECK AND RECEIVER HITCHES
FUEL TANK VENT MOD
MOSTLY HAULIN HAY AND HORSES 24,000lb.GVW TRANNY COOLER WITH FAN
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post #9 of 30 (permalink) Old 02-13-2012, 11:10 PM Thread Starter
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well i have put a new rad cap on, but did notice the other day that there was steam coming out from it a lil bit after it got hot. the top rad hose gets almost rock hard when it at temp though so i would think that its pressurized. i didn't see much movement in the overflow tank from hot to cold. the check ball does move i remember hearing it when i replace the tstat. now does the tstat have to be oriented to the check ball in order for it to purge the air?

86 F-250 4X4..7.3 non turbo from an 89.. E injectors and pump turned up.. 4 speed..3.55 gears.. new dual 4" exhaust by diamond eye-- with the muffler > for now!
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post #10 of 30 (permalink) Old 02-15-2012, 02:34 PM
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Are BOTH heater hoses "HOT" when the engine is fully warmed up and the fan on low? If not, the heater core is plugged.

Another possibility is that the AC system is running all the time, if you have it.

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