Cadillac 2007 STS Automobile User Manual


 
1. Remove the Intercooler System pressure cap
when the Intercooler System, including the
upper intercooler hoses, are no longer
hot. Turn the pressure cap slowly
counterclockwise about one-quarter of a turn.
If you hear a hiss, wait for that to stop.
This allows any pressure still left to be vented.
2. Then keep turning the pressure cap slowly,
and remove it.
3. Add the proper DEX-COOL
®
coolant mixture
to the fill neck, until the coolant reaches the
COLD FILL line on the fill neck.
4. With the Intercooler System pressure cap off,
start the engine and let it run for a couple of
minutes. Then turn the engine off. By this time,
the coolant level inside the fill neck may be
lower. If the level drops to where coolant is no
longer visible in the horizontal tube section
of the fill neck, with the engine off add more of
the DEX-COOL
®
coolant mixture to the fill
neck until the level is again visible in the
horizontal tube section.
5. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
If the coolant is not at the proper level
when the system cools down again, see
your dealer.
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