Question about Chevrolet Astro

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1994 chevy astro van is overheating. Fiiled radiator and overflow with antifreeze, burns out within 50 miles. Doesn't appear to be any leakage. Suspect defected thermostat. How do I change the thermostat?

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By "burns out" I assume you mean it is no longer in the radiator or overflow. Normally a bad thermostat stays in the open position causing the engine to run cold and never reaching normal operating temperature. When the engine is running and the vehicle is parked have you noticed vapor or dripping from the exaust pipe? This would happen if you have a bad head gasket and or a warped head. Another consideration; if the coolant has been a rust color the radiator may be stopped up and need to be boiled out.

Posted on Sep 05, 2010

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engine running too hot.check coolant level, should be 50/50 antifreeze and water.replace thermostat and radiator pressure cap.check antifreeze level in the radiator,coolant level should be just below radiator cap, add coolant to overflow jug,should alway be at the full cold mark.empty coolant overflow jug will allow air be drawed in the coolant system causing overheating.if overheating happens when coming to a long stop.could have faulty engine coolant temperature sensor or bad coolant fan fuse or relay.

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Overheating


Your heatercore is blocked up.

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My 2002 Oldsmobile Silhouette keeps overheating. We replaced the thermostat and flushed the system by adding new antifreeze. The air blows cold from the heater when the car starts to overheat. Once


there can be air pocket somewhere you need to bleed system properly. rais the front let is idle bleed it thru bleeding screw. be sure that bubbles are over.

air pockets prevent coolant travel inside system. so it may not reach to radiator, or cabin heater or both.

Nov 19, 2011 | 2002 Oldsmobile Silhouette

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My 2001 Ford Taurus keeps running too hot to safely drive. Whenever the car is started fluid immediately gushes out of the plastic resevior that you put the water/antifreeze leading to the radiator. I...


You have an air bubble at the top of the engine.
The antifreeze spewing out of the overflow happens due to your perfectly functional radiator cap
passing the overheated coolant/air mixture out of the system into the reservior (in an attempt
to relieve overpressurization of the cooling system)
The sudden nature of your overheating comes from the boiling of the inadequate amount of
coolant/antifreeze in your engine, since it cant properly cool the engine, so it boils (overheats quickly), and pressure rises immediately within the cooling system.
The Fix is free: locate and open the (air) bleeder port at the top of the engine, and add the usual
50% coolant/50% water mixture to the radiator until the radiator is full to the level indicated in
your owner's manual (or the "Full" line). Then close the bleeder port and replace the rad (radiator)
cap.
The air bleeder port is normally located near the thermostat, and should be opened each time
that coolant is added to the radiator. The air bleeder port need not be opened when adding
50/50 coolant to the reservior, since the rad cap is going to be closed while adding coolant
to this part of the cooling system.
Warning: driving beyond the point where your engine temperature gauge indicates overheating will
destroy the car's engine - it'll seize up due to overheating, and the only fix for a seized/burned-up
engine is replacement (of the engine). Seizing an engine is really easy with an air bubble in the
top of the engine - you could easily burn up/warp the head, necessitating replacement of the head
and head gask
et.

Sep 04, 2011 | 2001 Ford Taurus

1 Answer

2001 Expedition started overheating about two weeks ago. It normally runs about mid-range on the temp gauge, but when it overheats it shoots up into the red range within a couple of seconds. When I pop the...


You have air in the top of the engine.
The antifreeze spewing out of the overflow happens due to your perfectly functional radiator cap
passing the overheated coolant/air mixture out of the system into the reservior (in an attempt
to relieve overpressurization of the cooling system)
The sudden nature of your overheating comes from the boiling of the inadequate amount of
coolant/antifreeze in your engine, since it cant properly cool the engine, except for the first
10-25 minutes of operation - after that, it boils (overheats quickly), then pressure rises immediately
within the cooling system.
The Fix is free: locate and open the (air) bleeder port at the top of the engine, and add the usual
50% coolant/50% water mixture to the radiator until the radiator is full to the level indicated in
your owner's manual (or the "Full" line). Then close the bleeder port and replace the rad (radiator)
cap.
The air bleeder port is normally located near the thermostat, and should be opened each time
that coolant is added to the radiator. The air bleeder port need not be opened when adding
50/50 coolant to the reservior, since the rad cap is going to be closed while adding coolant
to this part of the cooling system.
Warning: driving beyond the point where your engine temperature gauge indicates overheating will
destroy the car's engine - it'll seize up due to overheating, and the only fix for a seized/burned-up
engine is replacement (of the engine). Seizing an engine is really easy with an air bubble in the
top of the engine - you could easily burn up/warp the head, necessitating replacement of the head
and head gasket.

Sep 03, 2011 | 1999 Ford Expedition

1 Answer

Temperature guage goes to high, but it doesn't appear that the van is overheating (no steam/fluid leaking) Radiator & thermostat were recently replaced. Guage will jump to high when idle, but...


FLUSH RADIATOR, HEATER CORE AND ENGINE BLOCK.ADD 50 / 50 ANTIFREEZE AND WATER ALSO REPLACE RADIATOR PRESSURE CAP.IF TEMPERATURE GAUGE STILL STAY HIGH THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.

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1 Answer

2005 kia sedona 76,000 overheats the engine


My 2005 KIA Sedona started overheating in Winter 2009/2010 and was loosing antifreeze. No leaks from the heater hoses or radiator hose. No pressure in the radiator either.

I had found a site where folks were discussing the same things and someone brought up the rear heater. Apparently KIA has run steel hoses running under the chasis to the rear of the van and these rot.

I looked under the rear at the wheel well and located the lines and they were wet with antifreeze. I traced the lines to the firewall and found where the lines were connected to the coolant system and bypassed the rear heater lines.

I then filled up the radiator and overflow tank with antifreeze and started the van. I rocked the van to get air to move out of the lines and kept adding antifreeze until it was full. then used the overflow tank to top it off.

Hope this helps.

Feb 12, 2011 | 2005 Kia Sedona

7 Answers

I have a 2005 Chevy Equinox, keeps over heating. We changed the thermostat, then the water pump, but it is still running hot. No leaks and no check engine light. Not sure what else the problem can be.


These trucks are bad about developing an air lock in the coolant system. Be sure that there is no air in the system after sealing. This can be done by using the bleeder on the top of the engine near the water jacket. Hope this helps. good luck.

Jul 22, 2009 | 2005 Chevrolet Equinox

1 Answer

Antifreeze comes out overflow and the van gets hot idling


THERMOSTAT FAULTY...OR ELECTIC COOLING FAN FOR THE RADIATOR...HOPE I WAS OF SOME HELP TO YOU.....

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1 Answer

1994 chevy astro van won't start after it overheated


Check your battery and make sure it has plenty of water in it. When your vehicle was hot the water in the battery could have boiled dry also.

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