H3 Series Vehicles - Cooling Pack (Radiator & Cac) Removal & Installation - PREVOST H3-41 Maintenance Manual

SECTION 05: COOLING SYSTEM
11.4 H3 SERIES VEHICLES - COOLING
PACK (RADIATOR & CAC) REMOVAL &
INSTALLATION
NOTE
For CAC only replacement, removal of the
entire cooling pack is not necessary. Refer to
paragraph 11.6 in this section for "in vehicle"
CAC replacement instructions.
WARNING
GALVANIC CORROSION PREVENTION
Galvanic corrosion (also called bimetallic
corrosion or contact corrosion) is
an electrochemical process in which
one metal corrodes preferentially to another when
both metals are in electrical contact.
To avoid galvanic corrosion problems, the
aluminum CAC and radiator have been
electrically isolated from the cooling pack
stainless frame.
When replacing the entire cooling pack with a
new unit, make sure before installation that :
There is no conductivity between the
-
frame and both CAC and radiator core
using a suitable ohmmeter or continuity
(buzzer) tester.
Note: If using ohmmeter, a minimum of
100 000 (100K) ohms must be observed to be
considered acceptable for installation.
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PA1621 Maintenance Manual All Series
When replacing the CAC or radiator unit only,
ensure that:
The rubber seal is present all around the
-
radiator perimeter and that it is in good
condition (replace as necessary).
Both rubber strips (upper & lower) are
-
present and in good shape at the edge of
the upper and lower support section (fan
side only).
Both uppers and lowers CAC insulating
-
bushings & washers are present and in
good condition at the CAC mounting
points (replace as necessary).
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Section 05 revised Feb 2019