Question about 1985 Chevrolet Celebrity

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Heater blower will not change from defroster to lower level heat

When I try to select the lower level setting for my heater, it remains on the defroster mode. what is wrong? what needs to be done?

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You are loosing vacuum either in the storage or the line feeding the cabin is leaking

Posted on Dec 30, 2008

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What all can make the heat stop working? Blower works but no Defrost an no heat.just. cold air. Changed thermostat changed lower rad.hose


The controls that let hot water flow through the heater core may not be working or the core is plugged stoping all water from entering. Easy way to test is with the engine up to operating temp, touch both hoses going to the heater. If one is colder than the other, the heater core is not getting enough hot water.

Jan 23, 2016 | Cars & Trucks

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Only get defroster. won't change to other levels.


That heater control is powered by vacuum. There is a small hard plastic vacuum hose going through the firewall next to the brake booster. This plastic line feeds the control panel and is either cracked or disconnected from the control panel. If your heat is only warm, then your thermostat is probably bad.

Dec 06, 2013 | 1993 Plymouth Acclaim

1 Answer

Heat stopped working in 2000 pontiac sunfire


With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.

Dec 18, 2011 | 2000 Pontiac Sunfire

1 Answer

The heater in my 2002 Dakota works only at the very highest setting. There is no power at the lowers settings. The defrost light doesn't come on until that setting also, so definantly no power. When turned...


I'm assuming you mean the fan only works on high. If that's the case the blower motor resistor is bad. When the fan switch is on high it puts a full 12Volts to the blower motor. When you have the switch in any other possition, the voltage is routed through the resistor and reduced thus making the motor run slower.

Dec 14, 2009 | Dodge Dakota Cars & Trucks

2 Answers

I have a mercury mountaineer 2003 V6. It has a problem of making sound repeated when I want to have heat turned on. No sound when the dashboard A.C/Heat stays at AC level, which is the zero? level. The...


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.

Sep 13, 2009 | 2003 Mercury Mountaineer

1 Answer

Blower for ac/heat only work on lower 3 levels.


Check the blower motor resitor. Use a 12v test light at the switch and notice the bulb brightness change as you switch settings.. Probably have a bad blower resiter.

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1 Answer

Heater/defroster blower and settings


Replace your blower motor resistor....

Jan 12, 2009 | 1999 Ford Explorer

1 Answer

2000 Ford Focus defroster does not work


try changing the pollen filter.. it could be blocked

Oct 22, 2008 | 2000 Ford Focus

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