Question about Cars & Trucks
Repalce the thermostat. you don't need to remove the alternator to do gthat if you ahve the 4.2 or 4.3 engine.
Posted on Mar 21, 2014
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Posted on Jan 02, 2017
The thermostat is under the alternator.
If you have a memory saver to keep radio & PCM settings, install it now.
Remove negative battery cable from battery. Remove positive cable from alternator and disconnect harness plug from alternator.
Remove accessory belt noting how it is installed for later reinstallation.
Remove engine lifting hook in front of alternator.
Remove (3) bolts holding alternator on.
Drain coolant from radiator (may want to start this as first step as it takes a while). Loosen pressure cap to aid in system draindown.
Remove radiator hose from thermostat housing.
Remove two bolts from housing and remove from engine.
Reinstall is reverse keeping in mind the following:
Cleanliness counts where thermostat housing seals to engine.
Thermostat spring should point into engine.
If the thermostat has a bleed port, it should go to the 12 o'clock position (up).
Posted on Jan 14, 2010
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