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I have 4 wires at thermostat, g, b, w, y. The old thermostat was removed before I owned the house. I would like a wiring diagram so I can trace the wires an know how to hook up. Thx. Ken

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Trace the thermostat wires into your furnace and write down which color wire ties on to which letter at the furnace terminal strip. The HVAC color code is - g (Green) = house fan b (Blue) = auxiliary w (White) = heat y (Yellow) = cooling. If you need anything, let me know. And please vote on this response. Thank you.

Posted on Apr 03, 2011


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How do I wire old Fedders single stage heat pump to modern smart thermostat? No aux heat.

Don, the best thing to do is see if there is a unit wiring diagram, if so, then trace out the wires connected to V,F,H,C,T,and X to determine what function they perform.

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How to replace Thermostat on 2006 Town & Country Van ?

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How to install thermostat

The best thing to do is to buy a Haynes or Chilton manual for your vehicle.

Purchase the replacement thermostat and gasket (no they do not come as a set.)
Items needed: socket and ratchet, a tube of liquid gasket, a wire brush, screwdriver for hose clamp

Open the hood, disconnect the Neg terminal of the battery (not the red one)
The radiator accept hot water at the top and feeds it to the water pump on the bottom.
Most thermostats are located on the engine block at the other end of the water hose going to the top of the radiator.
Trace it back, and remove the hose clamp.
Pull the hose clamp back (you do not need to take it off)
Pull the hose off the thermostat hosing neck.
The housing will be held on by 2 or 3 bolts, remove the bolts to remove the housing
The thermostat should come loose.
There will be gasket material stuck to the housing and the engine block, it must be scraped off before installing the new gasket.
Compare old thermostat with new one. Make sure they match.
A good tip is to stress the new thermostat in boiling water to insure it works. Boils some water, and place the thermostat in the water and watch it open. pour out the water, run it under cold water to cool it off.
After using a wire brush to remove the old gasket material,
place liquid gasket along the edge of the engine block opening and place the new gasket on the opening.'
Place the new thermostat in place (IT MUST GO IN ONE WAY)
Place the housing back on the engine block and replace the bolts, (tighten the bolts gradually )
replace the hose on the neck, and replace the clamp and tighten.
remove all tools and reconnect the battery

Good luck and don't forget to vote.

Oct 12, 2010 | 2001 Ford Windstar

1 Answer

2002 Audi 4.2. Where is the thermastat located

Thermostat is located in front of the engine between V cylinder banks, for Audi 4.2 V8.


Remove the thermostat housing (2 bolts) and the old thermostat. Note the orientation of the old thermostat (vent valve facing UP). Clean both thermostat housing and block surfaces and remove all traces of old gasket material. Install the new thermostat vent valve facing UP.
Please rate my response. Thanks!

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Most programmable thermostats have a configuration setting for the type of system you are using. They also normally have a configuration setting for the Heating Cycle Rate, Assuming it is wired correctly, I suspect the problem might be somewhere in one or both of those two configuration settings. Let me know what you find or if you have any further questions. :-)

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I wana put 04 harley hand controls on a 89 harley need wiring diagram

I think the wire colors changed sometime after 2000. If you still have the old controls, you may can make up your own wiring diagram. While you've got the switch housings open to put them on the handlebars, write down what color wires come off of what switch. Do the same with your old switches and your new switchs. If your horn button uses a red and a black wire on your old controls, and your new switch uses a red/white and black wire, then draw your diagram to match the red/white wire where the red wire went.

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drain half of the coolant.follow top hose to the thermmostat housing .loosen hose clamp then loosen the thermostat bolts.remove the thermostat housing and thermostat.remove traces of all the old gasket from housing and the intake where thermostat goes.becareful dont scratch the surfaces while removing all the old gasket.this info is for the 4.9 for the 4.6 engines. you have to remove radiator support cover .remove the air filter housing.loosen hose clamps .remove your thermostat housing bolts then thermostat.remove traces of all old gasket.on thermostat housing and intake. then put in new thermostat in. put on housing .torque bolts 18 to 20 ft lbs.

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1 Answer


You're going to lose some coolant, so have a bucket or other container ready. Follow the upper radiator hose to the point where it's connected to the engine. The hose is clamped to a metal housing which is bolted to the engine. Remove the bolts (not the hose) and lift the housing to expose the thermostat (may require a little prying with a screwdriver or similar tool). Note how the old thermostat is fitted (which end is up), lift it out of the engine, and then remove all traces of gasket from the housing and the engine. Install the new thermostat and gasket, replace the bolts, add coolant as necessary, and you're done.

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