North American Turbocoupe Organization



No heat
Anthony M Offline
Member
#1
Could somebody please tell me what all components are part of the heating system? My car warms up, but the air coming out of the vents is only luke warm. I just replaced the heater core last november, and put a new t-stat in over the summer. What else could cause this? Pleze im gonna be freeeezing if winter comes around soon. Thanx

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88 Turbocoupe
Front mount K&N
All else stock
88 TC, T3, Volvo IC
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Dan E Offline
Posting Freak
#2
Flush the system and put new coolant in it.

Maybe you got some gunk (that's the technical term LOL) left over from the old Heater Core and now it's plugging up your new Heater Core.

BTW, check the Vac lines under the dash going to the heater box to make sure they are all attached. Might be that your doors aren't closing to direct the heat ????

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Dan Eaves
88TC 5spd, Crower 5.5" Sportsman Rods, Short Wiseco Pistons bored .030" Over, Ported Head with Polished Combustion Chambers, Gutted & Polished Upper, Ported & Polished Lower, Polished T/B, Ported E6, SVO T3 .63AR Turbo, Bosch Bypass Valve, 3" DP w/No Cat, 2 1/2" DynoMax single cat back w/DynoMax Super Turbo Muffler, RR Cam, K&N in Fenderwell, Gillis Boost Valve, Centerforce I Clutch, Removed A/C, Polished Wheels, Polished Valve Cover, Polished Crank and W/P Pulleys, Walbro 255LPH HP Pump, Kirban Adj FPR, and the DAMN Heater Core is new too !

NATO MEMBER (Vice Chairman...if it's a vice...I deal with it)
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
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Jeff K Offline
Administrator
#3
Does your temp gauge (yes, I know it isnt accurate) show that the coolant is at normal operating temp?

If you have the manual HVAC controls, the blend door (routes air thru or bypasses heater core) is moved via a cable attached to the hot/cold lever. Follow the cable to the lever that operates the blend door, and be sure that when the leveris in the HOT position (over all the way to the right) that the blend door is fully at its max travel.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Anthony M Offline
Member
#4
Thanx for the advice guys. What is the best way to flush the system? I did that before and i just put a hose in the radiator inlet and took the outlet hose off the heater core and let it run through. Should i do that way again? About my temp gauge, actually it doesnt work. It doesnt budge past the C. I think that is the sending unit though. Ill also check the vac lines and the cables soon. Thanx
Anthony

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88 Turbocoupe
Front mount K&N
All else stock
88 TC, T3, Volvo IC
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Pete D Offline
Administrator
#5
To do the heater core, take both hoses at the firwall off and flush into the pipes. Do the one closest to the engine so you are backflushing the HC. Then alternate.

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NATO Member. it's not a vice, it's an obsession
"The nice thing about each new day is nobody ever used it before" Barnaby Jones
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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philS Offline
Senior Member
#6
Anthony

I wouldn't bet the farm on the gauge. Mine reads at the line right above C when it's fully warmed up. A few months ago I lost the lower rad hose, and w/o coolant the gauge only went to half-way.

For flushing, I would do the heater core, radiator, turbo and block - all separately.

If the heat feels cool and there is nothing wrong with the flapper door (as Jeff described) you could be low on coolant. Although not good for the car, pockets of air in the system will give luke-warm air from the heater as you described. I've had that before - when I was troubleshooting a new cooling system, and topping it off made the heater put out HOT air again.

I find it's easier to flush the block while the water pump is out but you don't want to remove it just for a flushing [Image: biggrin.gif]

My old man is always on my case to put in a can of water pump lubricant after re-filling the cooling system but I always forget. So I pass the advice on to you [Image: biggrin.gif]

Phil

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86 TC 3" Exhaust w/ Cat, 17 psi, 1.5" lower, Vovlo intercooler, Saab 900 cooling system
73 Austin Mini 1275
Did you hear about the Lucas powered torpedo? It sank.

86 TC, 73 Mini, 64 Mini Van, Saturn wagon
Click here to beat a ricer.
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Pete D Offline
Administrator
#7
"I wouldn't bet the farm on the gauge. Mine reads at the line right above C when it's fully warmed up. A few months ago I lost the lower rad hose, and w/o coolant the gauge only went to half-way."

If the coolant level drops below the level of the temperature sender there is nothing for the sensor to detect. The engine is still getting hotter if it's running.

The heater core is relatively high up, so if the system is low on coolant, you may not have much flow through the core. When the engine is cold, remove the radiator cap and see if the coolant level is with in 1.5 to 2.0 inched of the top. If it's further down than 2" you need to add some. When you did the T-stat job did you let it idle until the thermostate opened and get the air out of the system and add more coolant? If not it's probably low.
Pete Dunham


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Walsted Offline
Posting Freak
#8
Okay, do you have EATC or the manual controls? Troubleshooting the system is easier if we know which we are dealing with.

Have you verified that the hoses leading to the heater core are (or aren't) warm? If they aren't getting hot, it is a cooling system problem. If they are, it is a climate control problem. My initial guess is thermostat if it is a cooling system problem.

Good Luck.

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Mike Walsted - NATO member
1986 5-speed TurboCoupe and 1985 5-speed XR7
Mike Walsted - Sold my 1986 5-speed TurboCoupe
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Anthony M Offline
Member
#9
Thanx for the replys. The coolant is full to the brim so i know its not the level being a problem. Im gonna check all the lines on the back of the climate control this weekend,and yes it is the manual system. I hope to God its not the heater core seeing as i just put one in not too long ago [Image: smile.gif] OK I just took the car around the block and the HC hoses were hot. So im guessing it is the climate control. Buit ill flush the sytem anyways. Thanx

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88 Turbocoupe
Front mount K&N
All else stock
88 TC, T3, Volvo IC
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