Question about Mitsubishi Galant

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Heater does not work. There is a clicking noise from behind the dash. The heater hoses are hot and the thermostat has been changed. The heat was working just a few days ago and now it is not. The blower works but no hot air. It is a 2002 Misubishi Galant.

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  • benderdb Dec 10, 2009

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Dear Clicking.....
This is the blend door actuator(temp actuator) that is making the clicking noise, it is stuck in the either recirc mode or cool mode, there is only one way to correct this, replacing it.This actuator is on the evaporator assembly inside the car underneath the dash panel.Almost the entire paneling has to come off to replace this actuator.It runs about $70 for the part, and most dealers still have this in stock.The repair should take you about three hours, there is no way to mickey mouse it, it is best to replace it.Any questions get back to me....a chilton's manual can be purchased at your local autoparts store if you need any illustrations through the process...I'M HERE TO HELP!!!

Posted on Dec 10, 2009

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I changed thermostat on 2005 buick rendevous ultra 3.6l. still have no heat. whats next?


Was lack of heat in the cabin the only reason you changed the thermostat? Were the radiator hoses hot (or very warm) to the touch before you changed the thermostat? Were the heater hoses hot before you changed the thermostat? Did you get a check engine light and code stating that the engine was not getting (or slow getting) to operating temperature?
Getting heat from your heater depends on a blend door actuator letting air flow through the heater core in the HVAC unit. If your radiator hoses are hot, your heater hoses are hot, and you have no trouble code indicating the engine is not getting to operating temperature, but you are not getting heat inside the car, you need to check your blend door actuator or the control unit for the heater.

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My 1999 Ford Windstar, the heater is Not blowing Hot air, the Fan is working. Where is the Thermostat located??


the thermostat is in the thermostat housing. that is the end part of the upper radiator hose, where it connects to the engine. assuming the car is otherwise running OK it is not your problem, replacing it is a waste of your time. most likely the heater core is shot, that is where you should be looking. it sits within the heater box which is most likely behind the dash under the glove box, over the passenger footwell.

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If my car heater doesn't throw out heat just cold air what can it be


either thermostat needs repalcing or air trapped in heater. or blend door in plenum case not working. feel heater hoses going into dash panel behind engine and see if both are hot.

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My heater core is good and my ac and blwer works but have no heat in my car


If you know for sure the heater core is good? How do you know?
If it is indeed good, then the Vacuum valve that controls the water flow into the heater core is bad replace it.

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No heat changed thermostat


Are you saying the engine does not get hot or that your heaters are not working..?
If it's the heaters, change the temp control on the dash to full heat, then trace the heater hoses under the hood from the firewall back to the motor. Hopefully this will locate the heater tap. Now if the tap is vacuum operated, start the motor and check if there is vacuum at the small hose connected to the tap. No vacuum is correct. Now change the heater control to cold and there should now be vacuum at that small hose. if vacuum is still not present, or if you have vacuum but it does not go away no matter where the heater control is placed, suspect the control in the dash.. If the vacuum operation is correct, suspect a blocked or damaged heater valve and replace it..

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2 Answers

No heat


This sounds like one of two things, either there is not enough coolant in the system, or the heater control system is messed up. try this, with your car running at about 205 degrees (feel the upper radiator hose, it should be hot to the touch) grab both of the hoses going into the heater core behind the engine, the should be warm to hot. if they're not warm at all, or just luke warm, you either don't have enough coolant, or the hoses are blocked somewhere. if there is a valve in line with one of the hoses, try to operate it by hand, sometimes those valves (called heater valves) fail.

if the coolant is full and there is hot coolant in both hoses going into the heater core, then you're controls inside are likely the problem. try to turn the heat control from cold to hot and back again a few times, you should be able to hear a clapping sound,it might be very faint, so listen carefully. if you can't hear anything, it's likely the controls itself, unless you hear a hissing sound from behind the dash when you turn the control, that would be a vaccuum line unhooked. you'll have to pull some panels under the dash to find this vaccuum line to hook it up, but it's not too hard , just takes patience. (it's more common for a heater control to go first)

Jan 24, 2009 | 1999 Saturn SC

1 Answer

No heat


if the heater hoses are hot on both sides(indicating the engine is at full temp) and you feel the heat controller in dash is working properly, i would suggest disconnecting both heater hoses and backflush heater core with decent amount of pressure. if this improves condition but does not solve completely, heater core replacement is necessary.

Nov 15, 2008 | 2001 Mercury Grand Marquis

1 Answer

No heat,ch.thermostat,water is circulating,blower goin strong .


Check the 'heater control valve'. This valve opens when u turn on the heat switch on the dash, so the hot coolant will flow thru the heater core and provide heat. So although the coolant is circulating in the engine, the valve controlling the flow to the heater core is stuck closed, or not working.

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1998 jeep cherokeesport


Follow these steps:

Check coolant level, then start engine until it is warm and the thermostat opens. You will tell when it does when the needle on your temp gauge goes cold when it reaches around 180-200* and then goes back up. Now turn on your heater full blast and go to the engine compartment. You will see a heater valve located on the passenger side, next to the washer reservoir. It is a black thing with 4 heater hoses connected to it. Feel the hoses. When everything is working correctly it should be like this:

Hose going to waterpump will be hot
Hose going to (I think the thermostat housing) will be hot
2 Hoses going to heater core (mounted behind firewall) will be hot

1. If only 1 heater core hose is hot, heater core is clogged--
UNCLOG: remove 2 hoses going to heater core when engine is cool, hook water hose end to one of the sides and flush out gunk from heater core. Reconnect hose and you should be good.

2. If neither hose core hose is hot, heater control valve is bad or vacuum is bad--
Test Vacuum: remove vacuum line from heater control valve, you should feel the vacuum **** on it when pressed to your cheek and the heater control valve actuator should move when you unhook the vacuum line. If you have a good vacuum, it's probable the valve available at autozone part # 5941 for around $21.

To get heat while you wait to replace part, unhook silver arm on heater control valve that is hooked to the plunger. This will give you heat all of the time, but it is controlled by the bottom hot/cold switch on your heater control unit so you won't get hot in the cab. It will just circulate heat through the core.




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