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2004 Chevy express van 5.3 1500 AWD new water pump and thermostat but thermostat doesnt appear to be opening lower radiator hose is cold heater blowing cold air,could it bethe coolant temp sensor ?where is the coolant temp sensor on this van? and could it cause the thermostat to not open?

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Thermostats open by virtue of the coolant getting hot and expanding a wax insert that opens the flap valve. If the thermostat is not opening then one reason is that it is in the wrong way. The body of the unit has to face the head or coolant and not the hose. Next check the cores for blockages by having a flow test done on the radiator. Sensors have nothing to do with thermostats .All they do is turn fans on or tell the CPU when the coolant is hot enough to reduce the richness of the air fuel mixture.. Ensure that there is no air lock in the cooling system as it affects the heater operation if there is air in the heater and the hot water will not flow through the core. Ensure that the heater control module (tap) is allowing the hot water to flow to the heater core.

Posted on Dec 30, 2013

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rickyrt441
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SOURCE: 1992 Toyota 4Runner, overheats, radiator,upper

Thanks for choosing FixYa and welcome to the site. Have you checked to see if it is a coolant sensor? Have you checked to make sure the fans are coming on? Are you leaking coolant anywhere? Checked the cap?

Posted on Apr 10, 2011

  • 946 Answers

SOURCE: 98 ply breeze heater blows cold air, replcd water

Yep! Take the heater hoses loose from the engine(one at water pupm\\mp and other one at thermostat housing area usually). Then take your water hose at your house,with a common old pistol grip nozzle,and spray water back thru the heater hose you took off the water pump side and that will force it back thru the heater core and out the hose you took off the thermostat side.
If you want to see the junk that flies out of it,tie a white rag or old tee shirt onto the end of the hose.You'll be amazed what flies out of there.Reconnect your heater hoses and see how it does.
I always fill the hose full of water so when I reconnect them,they don't have any airlock problem. don-ohio (:^)

Posted on Nov 08, 2011

  • 4 Answers

SOURCE: 2002 CHEVY ASTRO VAN HEATER BLOWS COLD

sounds like a sensor is out or your fuse is out try those two things hope that helps

Posted on Jan 23, 2012

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1 Answer

Heaters running cold at 90 degrees


If the engine is running at a normal temperature I would suspect the thermostat.
Normally from a cold start the coolant should only circulate through the bypass hose, the heater matrix, and back through the engine, As the engine warms up and the thermostat begins to open the coolant is directed through the main radiator - at this point you will be able to feel the upper and lower radiator hoses warming up.
If the thermostat is faulty and permanently open you will be able to feel the upper and lower radiator hoses warming up very soon after starting the engine and at the same time as you feel the heater hoses begin to warm. This causes most of the heat to be radiated away and so the heater will never warm up.
Unfortunately the thermostat is hidden underneath the water pump on a passat and requires the cooling system to be drained before it can be changed. It may also require the power steering pump to be removed to get access to the thermostat cover.

Feb 01, 2014 | 2001 Volkswagen Passat

1 Answer

2004 Chevy express van 5.3 1500 AWD new water pump and thermostat but thermostat doesnt appear to be opening lower radiator hose is cold heater blowing cold air,could it bethe coolant temp sensor ?


could it be that you didnt bleed the system correctly... some new vehicles the radiator cap is lower than the thermostat causing an air pocket... you have to bleed this out... if there is a sending unit next to the thermostat housing pull it and see in antifreeze comes out.
also did yo put the thermostat in correctly ?
did you add almost 3 gallons of coolant and water ?

Dec 30, 2013 | Cars & Trucks

1 Answer

Running hot


Remove thermostat and test it by dipping it in cold water ib an open pot. Heat the water on the stove while observing the thermostat. It shold opel just before the water boils. If it does check the radiator itself for clogging. Also fluch the engine water galleries.

Sep 27, 2012 | 2000 Chrysler Town & Country

1 Answer

2006 CHEVY COBALT OVERHEATING HAS NEW RADIATOR WATER PUMP AND THERMOSTAT


That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.

Oct 26, 2011 | Cars & Trucks

1 Answer

2006 Chevy express van. Normally runs one mark below 1/2 mark. Lately ocassionally goes 1-2 marks above half way (usually when sitting idling). Have had coolant changed (Chevy dealer) and new radiator cap...


You've already eliminated #3 and #6, so keep checking...

Priority Action Part Type Cause
1 Inspect Radiator Cooling System Clogged.
2 Inspect Radiator Radiator Fins Obstructed.
3 Inspect Radiator Cap Worn or Damaged Radiator Cap.
4 Inspect Radiator Fan Motor Faulty Fan Motor.
5 Inspect Belt Incorrectly Routed, Adjusted (Tensioned), Missing or Worn Drive Belt(s).
6 Inspect Thermostat Faulty Thermostat.
7 Inspect Water Pump Worn, Cracked or Leaking Water Pump.
8 Inspect Radiator Fan Relay Intermittent Failure

Jul 16, 2011 | Chevrolet Express Cars & Trucks

1 Answer

Where is the bypass hose for the water pump located on a 2005 chevy equinox?


open hood and while looking at engine on the left side follow the lower radiator hose up to the water pump right above where the hose connects are the two hoses top goes to heater core for inside cabin the other goes to heater rail on engine their is no [bypass hose ] for water pump -on the right side of engine is the thermostat -stat outlet housing and upper hose

Jun 28, 2011 | 2005 Chevrolet Equinox

1 Answer

2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat


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.

Nov 19, 2009 | 2004 Dodge Ram 1500

1 Answer

Replace thermosat in 2005 chevy express van


Easy, simply trace the bottom radiator hose (lower left of the radiator) from it's connection point on the radiator to it's connection point on the engine, that's where the thermostat is located.

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1 Answer

Need to change thermostat in 01' Chevy Astro Van


It is located where the big hose comming out of your radiator connects to top of engine. Remove hose from engine your thermostat is undernieth

Nov 15, 2008 | 2001 Chevrolet Astro

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