Question about GMC Sonoma

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Starts to overheat while sitting in trafic, a/c does not blow cold air. Stays at 195 degrees while driving. thermostat replaced, coolant flushed and refilled.

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  • jlwbeulla Jul 23, 2008

    The fan is good.

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Personally i would have my rads cleaned and flow checked, it could also be some rough spots on the radiator filler neck try to sand it smooth then cap replaced.

usually poor cooling and irregular guage reading can be a result after a water pump replacement.

Posted on Jul 23, 2008

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It's possible that you have a plugged heater core. This will cause the problems you're haveing.

Posted on Jul 23, 2008

  • Ryan Rogers
    Ryan Rogers Jul 23, 2008

    You can check the heater core rather easily by finding the two hoses that run through the firewall to the core, let the engine warm up at an idle for about 20 minutes, then feel the hoses. With the thermostat open, the hoses should be the same temp. If one side is cooler than the other, the heater core is plugged and not getting a good flow.

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Just check whether fan is working properly .........also check the condition of capacitor inside ac unit

Posted on Jul 23, 2008

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1 Answer

Monte carlo blows cold air and overheats


It really runs hot within a minute of starting ?
An engine that runs hot in a few minutes is often having problems with the water pump or a blockage in the cooling system. The thermostat does not open until 195 degrees which takes 5 or 10 miles of driving.
During that time, the water pump should be circulating coolant in the block and the heater hoses.
A leaking head gasket should be putting extra pressure into the cooling system, and-or dumping coolant into the cylinders which would come out the exhaust pipe. But it should still take a few minutes for the engine to reach the boiling point of 240 degrees.

Mar 09, 2014 | 2004 Chevrolet Monte Carlo

1 Answer

I have a 2005 VW Passat. In September I replaced the heater core, I flushed the coolant and replaced the coolant, because I wasn't getting any heat, it was just blowing cold air. I was told it wasn't the...


Are your cooling fans working?Could be your thermostat,to check put in pot of hot water at 190 degrees and see if it opens,then remove to see if closes,if it does this,then it's good,another thing is the coolant may need bleeding,air inside system or bad water pump,not circulating,bad bearing.

Dec 09, 2013 | Cars & Trucks

1 Answer

Heater issue


This sounds like a thermostat that is fully open all the time. It allows the engine coolant to warm when sitting still (no air being forced thru the radiator), but even that goes away when moving, since the air through the radiator will remove that heat from the coolant. Does you van have a temp gauge? Is so, at full operating temp. most vehicles have coolant temps of 180-195 degrees F, depending on the thermostat installed. Anything less indicates a thermostat that is starting to malfunction.

Dec 08, 2013 | 2000 Mercury Villager

1 Answer

After a few minutes of driving the engine begins to overheat. The engine signal and the warning cooling light both come on. Although the engine temperature is 90 degrees, the indoor heating fan is still...


There could be 3 possible problems here.

If the dashboard is saying the engine is overheating at 90 degrees and there is still cold air coming through then the thermostat could be faulty. I would suggest that you remove the thermostat and place it in a beaker of boiling water. If the top begins to open as the temperature rises, then it is fine. If not, then the thermostat will need to be replaced.

If the thermostat is fine, I would then suggest that you check your coolant levels, the coolant pressure or make sure there isn't a crack in the radiator. If there isn't enough coolant in the system then it won't perform to its highest standards. If the coolant pressure is too low, then it won't be able to cool high temperatures, although 90 degrees isn't very high for the engine to overheat. If your radiator has a crack in it then it will be leaking coolant which would explain a low coolant level and loss of pressure.

A third problem could be air getting into the heating system which will cause air to get trapped in the radiator. This would stop the normal flow of coolant. So now I would suggest checking the cylinder head gasket and do a pressure test to see if there is any air getting into the system.

Feb 02, 2011 | 2002 Volkswagen Golf

1 Answer

76 COUPE DE VILLE NO HEAT!!! FLUSHED COOLANT SYSTEM REPLACED ANTI-FREEZE, REPLACED THERMOSTAT TO 195 DEGREES, REPLACED A/C THERMO VACUUM SWITCH, HOWEVER FLUID IS CIRCULATING THRU HEATER CORE. THERMOSTAT IS...


Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.

Jan 16, 2011 | 1976 Cadillac Deville

2 Answers

New water pump, thermostat. Heater blowing tepid to cool air since replaced.


sounds to be a faulty thermostat did your car over heat my vehicle does the same thing its the thermostat when its cold out your vehicle loses all its engine temperature and blows cold air make sure you use 50/50 antifreeze

Nov 29, 2010 | 1996 Chevrolet Camaro

2 Answers

Fine when travelling but overheats when in trafic


When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

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Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

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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!

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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

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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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Oct 27, 2009 | 1991 Peugeot 405

2 Answers

1998 Dodge Durango no heat when using heater.


BLEND DOOR STUCK OR BROKEN. NEEDS TO REMOVE DASH AND HEATER/EVAP CORE BOS TO REPAIR REPLACE.

Jan 08, 2009 | 1993 GMC Safari

2 Answers

2001 JEEP ..RADIATOR IS COLD


what is the water temp at the dash...leave the rad cap off until normal temp... might be an air lock. If the engine overheats fast and blows coolant out the filler then its a blocked radiator...why did you repace the thermostat

Dec 24, 2008 | 2001 Jeep Cherokee

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