No heat cold air and one holes to the heater core is hot the other two are cold
Clogged heater core, try to flush it. but will probably need replacing
SOURCE: no heat
i have a 95 caprice, it happen to me also just back flush heater core and it will work fine
try this before you go and buy one trust me it works
SOURCE: i have a 2000 dodge caravan, no heat
Sounds like the air "blend" door might be inoperable. This door opens and closes a specified amount to regulate the amount of either cooled or heated air, as requested by the climate control unit. If the door is continually in the position which is bypassing the heater core (cold setting), the air will not get warm regardless of the condition/operation of the heater core. I'd suggest having this component checked.
SOURCE: heater is blowing but its cold air not hot air 2000 expedition
Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.
SOURCE: 1995 f350 blows cold air, heater core is hot but
you will need to replace the air temperature control blend door actuator. go to the link for heater core instructions, they are the same for 95-97 for the blend door except u of course are not replacing the heater core, but the same access to the internal parts of the dash are required for both parts.
http://my.voyager.net/~sscully/F-15097HtrCoreRepairF150_Exp_002.doc
SOURCE: 2001 Lincoln LS heater blows
When the engine is cold,check the coolant level.
Make sure it's on max.
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A coolant system should be flush every two years.
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If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.
The DIY method is to drive you car onto a ramp or a steep hill.
Iet the engine cool off and top off the coolant tank.
Set MAX heat + MAX fan
Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,
Check coolant level and top off coolant when the engine cools down.
A shop will charge $75+ for this but using an air operated excavate tool!
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A car with over 90K miles may experience linkage problem to the heater control valve.
The heater control valve (near the firewall) may be stick over time.
Open the hood and move the heater to max and min. Back and forth.
Clean and lube the linkage with WD-40 to free the heater control valve.
If it's a vacuum type heater control valve then cash for leaky vac. hoses.
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Move the fan switch back and forth to re-new the electrical conductors.
Pass a vacuum over the control panel to prevent dust build up behind the console.
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