Chapter 3 Cooling, heating and air conditioning systems 3-3
3.10a Removing the thermostat housing
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3.10~ Thermostat installation details (3.OL engine)
1 Upper radiator hose
3 Gasket
2 Thermostat housing 4 Thermostat
3.10b Thermostat installation details (2.OL and 2.4L engines)
I Upper radiator hose 3 Gasket
2 Thermostat housing 4 Thermostat
2 If the engine seems to be taking a long time to warm up (based on
heateroutputortemperaturegaugeoperation), thethermostatisprobably
stuck open. Replace the thermostat with a new one.
3 If the engine runs hot, use your hand to check the temperature of the
upper radiator hose. If the hose isn’t hot, but the engine is, the thermostat
is probably stuck closed, preventing the coolant inside the engine from es-
caping to the radiator. Replace the thermostat. Caution: Don’t drive the
vehicle without a thermostat. The computer may stay in open loop and
emissions and fuel economy will suffer.
4 If the upper radiator hose is hot, it means that the coolant is flowing
and the thermostat is open. Consult the Troubleshooting Section at the
front of this manual for cooling system diagnosis.
Replacemen f
Refer to illustrations 3.1 Oa, 3.1 Ob, 3.1 Oc and 3.13
5 Disconnect the negative battery cable from the battery.
6 Drain the cooling system (see Chapter 1). If the coolant is relatively
new or in good condition (see Chapter l), save it and reuse it.
FIANCE FIANCE
AIR VENT AIR VENT
FLANGE IN FLANGE IN
IN Gr
3.13 Thermostat installation (2.6L engine shown)
7 Follow the upper radiator hose to the engine to locate the thermostat
housing.
8 Loosen the hose clamp, then detach the hose from the fitting. If it’s
stuck, grasp it near the end with a pair of Channelock pliers and twist it to
break the seal, then pull it off. If the hose is old or deteriorated, cut it off and
install a new one.
9 If the outer surface of the large fitting that mates with the hose is dete-
riorated (corroded, pitted, etc.) it may be damaged further by hose remov-
al. If it is, the thermostat housing cover will have to be replaced.
10 Remove the bolts and detach the housing cover(seeillustrations). If
the cover is stuck, tap it with a soft-face hammerto jar it loose. Be prepared
for some coolant to spijl as the gasket seal is broken.
11 Note how it’s installed (which end is facing up), then remove the ther-
mostat.
12 Stuff a rag into the engine opening, then remove all traces of old gas-
ket material andsealantfrom the housing and coverwith agasketscraper.
Remove the rag from the opening and clean the gasket mating surfaces
with lacquer thinner or acetone.
13 Install the new thermostat in the housing. Make sure the correct end
facesup-thespringendisnormallydirectedintotheengine(seeillustra-
tion).
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