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Old December 15th, 2011, 08:23 PM
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JSoko JSoko is offline


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Thumbs up How to Replace a Thermostat

How to Replace a Thermostat

Save a big repair bill with this simple fix

Replacing a car's thermostat (or T-stat) is an easy and inexpensive repair, and in most cases will cure an overheating or no-heat problem, sparing the time and expense needed for expert diagnostics.

In most cases, the cause of an overheating or no-heat condition in your vehicle is a faulty thermostat. And since a new “T-stat” costs only about $8, it makes more sense to replace it than to spend hours diagnosing the problem. If that doesn't fix it, at least you're only out about two hours.

Pick up a new T-stat and gasket, as well as RTV sealant, fresh coolant (to top off the system). Then gather up your sockets, a gasket scraper and a drip pan. Slide the drip pan under the engine to catch the spilled coolant, if ya feel like it, cause Dogs like the way it taste and it WILL KILL them.

The T-stat is usually located near the top of the engine under a “gooseneck” housing attached to the upper radiator hose. If yours isn't there, consult a shop manual to locate it. Remove the two or three bolts that hold the gooseneck in place and remove the T-stat by Pry off the gooseneck. Then remove the thermostat from the engine or the inside of the gooseneck. Next, clean both the engine and the gooseneck sealing surfaces. Use a scraper to remove the old gasket and any sealing compound. Then dry the surfaces with a rag. Clean both mating surfaces.

Install the new thermostat and gasket
Place the new thermostat in the recessed groove in either the engine or gooseneck (air bleed toward the top, if ya aint sure which way it goes back in the spring goes to the top or watch the way it came out). Hold it in place with a self-adhesive gasket. Then apply a bead of RTV sealant.

If the parts store gave you a plain gasket, coat one side with RTV sealant (self-adhesive gaskets don't need sealant). Then install the T-stat and gasket. If the old T-stat used a rubber O-ring instead of a gasket, lubricate the new one with fresh coolant before you insert it.NOTE: make sure the o-ring doesnt slip outa the groove
Reinstall the gooseneck and top off the coolant.

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Last edited by JSoko; December 15th, 2011 at 08:37 PM.

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