Question about 1997 Buick Skylark

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Heater vacuume the engine seems to be different than the original. the vacuume lines seem to be not hooked up.

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You will have to figure out if it is or not and get a vacuume diagram for the engine and the car and see which ones are which

Posted on Nov 12, 2008

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Where Do The Vacuum Lines Hook Up At?


Engine vacuum is created in the intake manifold, so that is where all vacuum lines originate. There are many applications for vacuum, a few are for emissions, others for the brake booster, cruise control, A/C-heater assembly, and so on. You would need a diagram of the vacuum lines for your vehicle to sort them all out. Look for a sticker under the hood, most cars show a diagram.

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My heater is not working correctly in my 2000 lincoln LS. it may blow a little heat when I only have the air set at midway. It's not very hot though. my engine is not running hot. I have checked the...


Follow the heater hose from the engine, and as you get closer to the firewall, you should run into it. It is in line with the hose, and should have a vacuum hose connected to it. Apply vacuum to the valve and it should move. If not, then replace the valve. If there is no vacuum when engine running and heater turned on, then check the hose for leaks or the vacuum source.

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Heater vents close and it sounds like blower motor gets louder when passing gear is used


You most likely have a vacuum line leak -- could be in a hose run to the vacuum motors which operate the duct doors or various other places. Vacuum drops off when engine is rapidly accelerated which reduces the vacuum the heating system motors receive. The blower motor seems to get louder because the closing of the doors provides the sound of the motor a different (more open) path to your ears.

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1 Answer

We replaced the thermostat in ford f150 but heater still blows cold air


another expert named:
telemachus
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First, if the engine seems to take forever to warm up, you may have a stuck (open) thermostat. Replacing the thermostat would help get your engine to warm up quickly and maintain the proper running temperature of about 180 deg F. This would solve your heater woes.

However, if the engine warms up normally but the heater just doesn't seem to put out, check the heater inlet valve. This valve is usually next to the firewall on the engine side and is activated by cable(s) or vacuum lines. It is common to find that the valve cables have frozen, the cable ends have broken off, or the vacuum lines are disconnected or broken. Another common problem on vacuum run valves is that the vacuum diaphragm that operates the valve has failed. The diaphragm won't "hold a vacuum" meaning that it leaks and won't operate the heater valve.

If all that seems to work okay. The heater core could be getting warm coolant through it but the underdash heater air handler box has a movable door inside that is not in the requested position. These doors are operated by cables or vacuum lines---so same checkout as above.

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I have very little heat, how do I fix the problem?


you may need a new thermostat if its stuck open or the heater core is plugged up and needs replaced or flushed.

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1 Answer

2000 s-type heater only blows cold air. Pulled the heater control valve. How do I tell if its good or bad?


If it is a vacuum controlled unit, you will need one of the small vacuum hand pumps to hook to the valve and watch the internal baffle plate move with change in vacuum level. There may be a local parts dealer that will let you borrow one for the test (and sell you a new part if needed). If the valve seems to work ok, then check the engine area looking for a loose or damaged vacuum hose. Lastly, the temperature control panel may be defective. Check the hose going to the valve for damage. Make sure the heater hoses going to the core are very hot when the engine is warmed up. If they remain cold, something is blocking water flow through them.

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1 Answer

1993 Toyota Paseo - Engine dies when clutch depressed


Absolutly, Your idle control valve at the end of your fuel rail has a vacuum line and its sensitive to pressure changes. One way to double check that would be to hook everything up normally and pull that vacuum line off your idle control valve. Are the symptoms the same?

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1 Answer

FINISHED HEAD SWAP, SAMURAI WON'T START.


piston rings worn,,oiling up plugs, and cousin back pressure.Thats why you have oil blowing out every where.

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2 Answers

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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