Low Coolant Temperature Diagnosis Guide; Engine Overheating Diagnosis Guide - Jeep 1987 Wrangler Workshop Manual

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COOLING SYSTEMS
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Low Coolant Temperature Diagnosis Guide
Gauge Indies
Hmtm Outpi
tion Normal-
it LO¥¥
Heater Controls Improperly
Adjusted. Refer to Heating
and Air Conditioning
Chapter.
Coolant Temperature L o w or
Warms Up Slowly
Gauge Indication Low-
Heater Output Normal
Check and Repair Temperature
Gauge and/or Sending Unit
O K
Check Thermostat Operation
Gauge Indication L o w -
Heater Output L o w
Check For Loose Thermostat
Housing Bolts
NOT OK
Tighten Housing Bolts
With Specified Torque
Replace Defective Thermostat
Engine Overheating Diagnosis Guide
Overheat Indicated on Gauge
—
1 1 1
r
Check Coolant Level in Radiator
and Coolant Recovery Bottle
No Coolant Loss
Coolant Loss
Check Fan Belt Condition
and Tension
Add Antifreeze or Flush System I
and Fill with Correct Mixture 1
Replace Fan Drive -NOT 0K-
Check Tempatrol Fan Operation
Refer to Tempatrol Fan Test
for Procedure.
Ctmok for Airflow
Restriction
1
, OK
1
NOT OK
O K
Cl e an Radi a tor Fins
and/or A/C C o n d e n s e r
Ch#ck for twitting or Displaced
Radiator Air Seals
NOT OK
Replace or Reposition Air Seals
O K
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