Question about 1994 GMC Sonoma

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Little to no flow in radiator w/engine running and cap off

I just replaced thermostat

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Check that you have replaced the thermostat with the bulk of the unit facing the head or block. IT will not allow circulation ( fit installed correctly ) until the engine temperature reaches 85 decrees at which point you will feel the top hose start to get hot.

Posted on Mar 19, 2014

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3 Answers

Engine overheats with the coolant recovery tank completely full (leaking out overflow) & heater doesn't work to remove heat from coolant.


My first guess would be air in the cooling system. For some reason liquid coolant is not flowing thru the engine.
As the engine warms up, the heater hoses should get hot and then the radiator hoses. If you take the thermostat out, you should be able to run the engine and see coolant flowing in the radiator, depending on the make and model.

May 03, 2015 | Cars & Trucks

1 Answer

I have no heat unless the car idles for a long period, 15 maybe 20 mins. The gauge warms up as the motor does and there's no indication that the heater core is leaking. I want to try something...


Before even trying a new thermostat, try blocking air flow past the radiator and engine area with some cardboard in front of the radiator. If your temp. gauge shows below half all the time, try a hotter rated thermostat, one that stays closed just a bit longer. Say your t-stat is rated at 190 degrees, get one that is rated at 193 degrees- do small raises to avoid overheating-and in the summer, you may want to go back to the lower rated t-stat.. A parts store or Ford dealer could help you pick an optional thermostat.
To replace, drain enough coolant from the radiator so the level in the engine is below the thermostat housing. Take off the upper radiator hose from the thermostat housing. remove retaining bolts or nuts from the housing, any other obstructions, and pull the housing off, replace thermostat, clean the gasket mating area on the housing and the engine block, use a new gasket and fit all back together. Careful not to overtighten the t-stat housing bolts: the torque specs would be small-about 15-20 foot pounds of torque-just snug them down good-you can always go back and re-tighten a little if you see a leak. So, all back together, refill coolant and overflow tank, run engine with radiator cap off till engine is hot, and thermostat opens-this will helpyou bleed air out of the system. When thermostat opens, coolant level should drop a little. Shut off the engine, top up radiator and overflow tank as necessary, and replace radiator cap. Check for leaks.

Nov 09, 2012 | 1991 Ford Escort

3 Answers

Engine overheating i have replaced the radiator has plenty of water


replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and water.to bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater hose.open bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

Aug 18, 2012 | 1998 Oldsmobile Intrigue

4 Answers

2004 dodge dakota p/u is overheating after a 10 mile ride. new water pump, new upper radiator hose with 13 psi cap. radiator removed and checked at shop. said it has good flew. will replace lower...


Have you checked the thermostat?

Once the engine is up to operating temp both the upper and lower hoses should feel about the same temp and the radiator should be hot all the way across. If the hoses are two different temps and the radiator never gets hot than there is a flow issue. Most likely the thermostat is stuck or partially stuck closed.

The other possibility is you have not burped all the air out of the system after you made the repairs. It is important to let the vehicle warm at at idle with the radiator cap removed to help remove the air in the system. Once the engine is up to operating temp raise the RPM a little and continue to add coolant as necessary. Once the coolant level remains steady replace the radiator cap and test drive.

Hope that helps. If you have any more questions I'll be happy to answer them.

Aug 02, 2011 | 2004 Dodge Dakota

2 Answers

I have a 2001 4.7 SLT 2x4 Dodge Durango. Some time ago the car would overheat and spit water/antifreeze from the readiator cap over the battery. I replaced the radiator cap. A few weeks later, it...


if the fan electric fan is not comining on, you need to check the fan motor to see if your motor is bad on the fan. check it by running a hot wire directly from your car battery to the fan elecrtic plug.

Jun 20, 2011 | 2001 Dodge Durango

2 Answers

Over heating on my dodge intrepid 1997 after short time of driving


CHECK ENGINE COOLANT LEVEL.MAKE SURE COOLANT OVER FLOW JUG HAS COOLANT IN FULL COLD MARK.IF COOLANT OVER FLOW JUG IS EMPTY RADIATOR GOT TO BE LOW ON COOLANT POUR COOLANT IN THE OVER FLOW UNTIL COOLANT LEVEL STAY AT THE COLD FULL MARK.SEE IF RADIATOR DONT HAVE A RADIATOR CAP YOU HAVE TO POUR COOLANT IN THE OVER FLOW JUG COOLANT WILL FLOW DOWN IN RADIATOR UNTIL COOLANT LEVEL STOP AT FULL COLD MARK.IF COOLANT LEVEL OKAY.YOUR THERMOSTAT NEED CHANGING ALSO RADIATOR PRESSURE CAP.HAVE RADIATOR FLUSHED OUT.HAVE ENGINE BLOCK FLUSHED OUT.CHECK ENGINE OIL IF OIL LOOK LIKE MILK SHAKE ON OIL DIP STICK YOU HAVE LEAKING HEAD GASKET THAT WILL CAUSE ENGINE OVER HEAT WHILE CAR IN MOTION.CHECK WATER PUMP MAKE SURE ITS WEEP HOLE NOT LEAKING ANTIFREEZE IF SO WATER PUMP NEED REPLACING.

Jun 20, 2011 | 1997 Dodge Intrepid

3 Answers

I put a new thermostat on my 2005 grand dodge caravan yesterday, today I have no heat. Some said vapor lock, where is the air drainage on this model?


there is no air bleeder, It will bleed it self . Or you could put a pan under radiator to catch coolant spill, Put pan under radiator, remove radiator cap, start engine,let engine run,have a 50% coolant mix on hand, when engine warms up the thermostat will open and allow flow of coolant. just as the thermostat starts to open air will release causing coolant to spill over filler cap inlet, this is normal, the pan is so you don't waste coolant or make a mess. in a few moments as the thermostat opens to full position the coolant level will fall in radiator, at this time you will fill radiator untill it will take no more,put cap on radiator and use clean fluid you caught in pan or coolant in jug or whatever you have it in and fill the coolant reservoir to fill line. i hope you have heat now ! check reservoir again the next day, if low fill and you should be good !! do this procedure when engine is cold,never remove a hot radiator cap. but if you were too, make sure you squeeze upper radiator hose, IF IT IS HARD OR UNDER PRESSURE, DO NOT REMOVE !!!! If you can squeeze the hose then put a rag over cap and remove slowly a little pressure or coolant might spill but should be minimal. I have alot of experience in this and severe burns are possible to the inexperienced !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Jan 13, 2011 | 2005 Dodge Grand Caravan

1 Answer

No heat ..help installed new heater switch, replaced water pump..replaced coolants, and thermostat......................what else could it be? Nissan 2003 GXE Sentra 1.8 L Engine/...


you could have an air pocket in the cooling system that has to be burped. With a cold engine, park uphill and leave the radiator cap loose. Fill radiator and coolant reservoir. Start engine with cap loose and run at 1500 rpm until temp gauge reads normal. Feel if top radiator return hose from engine to radiator is hot. If yes, coolant is flowing and thermostat is open. If cold, thermostat is not staying closed until engine is hot.

report results.

Oct 29, 2009 | 2002 Nissan Altima

1 Answer

This car runs hot when idleing but is fine at highway speeds. I just replaced the water pump and had the radiator rodded out. the electric fan is running fine and moving air well.


The thermostat might be stuck open. If it is then water running into the radiator is not spending enough time there to cool off before flowing back to the engine block. At speed the increased airflow is having a greater cooling effect while blowing through the radiator fins. With the car totally cool, open the radiator cap and then start the car. Watch the water flow in the radiator. If it is flowing straight through right from the start, you'll know it is the thermostat. It should sit in the radiator until the engine reaches opening temperature and then the flow begins. As soon as the cool water from the radiator reaches the thermostat, it closes and the flow stops. So constant flow equals bad thermostat, flow then stop then flow equals working properly.

Aug 03, 2009 | 2002 Ford Mustang

2 Answers

Car till goetting to hot


you might need to add water to your radiator

Jun 03, 2009 | 1993 Chevrolet Caprice

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