Question about Chevrolet TrailBlazer EXT
The top radiator hose is compressed, the overfill box is full and it is not making heat. Is it possible that the thermostat is broke?
Yes I would replace the thermostat the compressed hose would point to the thermostat sticking
Posted on Jan 23, 2013
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Posted on Jan 02, 2017
Replace the bad radiator hose first. Second- get you special formulated anti-freeze dye from the auto store and pour it into the radiator. Third- make sure you got all the air pockets out of your system, cause the coolant system won't work with air pockets in it. Fourth- Check for leaks by looking for the colored dye. If it's not the radiator hose, then could possibly be a pin hole in your radiator. Would suggest replacing all the radiator hoses at the same time while you got the coolant system disconnected, cause you don't want to have to come back and replace another hose in a few months.
Posted on Nov 06, 2009
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Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.
Posted on Nov 19, 2009
When the car is completely cool,check the electric fan(s) for smooth rotation.
Clean/check/change the thermo sensor,contact and wire.
Excavate air pocket in coolant system / check for head gasket leak
This test will kill two birds with one stone.
MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!
RAN THIS TEST IN A WELL VENTILATED AREA ONLY!
You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!
Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .
Top of the coolant reserve tank
Let it ran for 10-15 minutes.
Monitor for air pockets escaping from coolant reserve tank.
Small amount of bubbles is OK at 1-5 minute mark
After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.
If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.
Give the thermostat host few gentle taps.
If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.
Let engine cold down and top off coolant reserve tank.
Start monitor for coolant lost
A coolant flush is require every 2 years or 24,000 miles.
I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.
Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.
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Posted on Dec 05, 2009
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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