Service manual

INSTRUMENTATION

SERVICE MANUAL NUMBER 26

90-861329--1 MARCH 1999 Page 4D-11

Water Temperature Sender

There is no accurate test that can be done without special equipment. Install new sender.

TESTING

1. Connect an ohmmeter between temperature sender terminal (+) and hex (case) for

ground (–) as shown.

72768

a-Ohmmeter Leads

b-Water Temperature Sender

WARNING

The following test involves the use of intense heat. Failure to follow appropriate

procedures or warnings can cause burns which can result in severe personal injury.

While performing the following test, observe these general precautions:

• Wear personal protective clothing such as rubber gloves, a non-flammable

apron, and eye protection - preferably full face shield or safety glasses.

• The appropriate heat source should only be electric. Heat source should be

operated by a qualified person. Be sure to follow all instructions of the

manufacturer of the heat source. The heat source should be checked each time

it is used to be sure it is functioning properly.

• The thermometer used in the test should be a high-temperature thermometer

with a maximum reading of at least 300°F (150°C). Under no circumstances

should the operator allow temperatures to exceed test specifications.

• Perform test only in a well ventilated area.

• Use a suitable container, such as metal, to hold the water. Avoid use of glass

containers unless the operator first confirms for himself/herself that the glass

container is an appropriate high-temperature vessel.

• Because the components will reach high temperatures DO NOT handle materi-

als or components until COMPLETELY cooled.

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