Question about 1995 Chevrolet Tahoe

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Not getting proper heat from heater?

Changed t-stat and antifreeze. Temp gage indicates temp coming up to 195 degrees then instantly dropping back to about 160 and luke warm air at best. Continues to this this? What could cause this? Thanks

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It can be one of 2 things,,,,the water pump being bad or the heater core is partially clogged

Posted on Jan 20, 2009

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I have a '98 Olds Silhouette cooling fans work when A/C is on but will not come on even when temp is above normal operating temp if A/C is off


Just saw your second posting, so the temp is still above normal. Could the sensor
that controls the fan be not reading the heat properly ? The antifreeze/coolant
issue could still be relevant, so I will re-post that info. Tho.
Electric cooling fans will sometimes come on after a vehicle is parked,
(It actually heats up when stopped), but not when it is rolling down the road
because the movement is applying some cooling effect to the engine.
\
If the engine is not actually overheating, then the fans may be working
normally. Also, make sure your water/antifreeze mix is correct by using a
specific gravity tester. It is a tube with 4 or 5 balls, some of which will float
to give you a reading. Contrary to popular belief, More is not better when it
comes to antifreeze/coolant. It needs water to work properly. Too strong a
mix will actually make your vehicle run cold so that the temp sensors and
heater will not function properly. The engine will not achieve proper operating
temperature and may actually damage some of the components by running
it cold, affect timing, spark, etc. This could also cause the symptoms you
describe. The engine would not actually reach the proper heat threshold
until you added the extra demand of the AC heat transfer. But the first criteria
would be whether the engine is actually overheating / or in normal range .
It may be that the colder weather is allowing the sensors to come on a little
later, warming the engine and heater components a bit more than they would
in warmer weather. Would be good to know what the actual coolant temp is.
Could check that with a guage, and also check to see what temp thermostat
you are using. 195 degrees in the winter would be better, 165/180 or so in the
warmer months

Nov 30, 2011 | 1998 Oldsmobile Silhouette

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I have a 2007 Chevy Expreess 1500 van. When ambient temperature drops below say 80f outside I get a P0128 check eng code. If during the day the ambient temp raises above 8-85f the light will go out...


P0128 is a generic code to indicate that the engine isn't reaching proper temp. If it has
the Vortec 4.3 like my S-10 is (I am having a similar problem). Check the overflow
tank as the tube will come off and allow air into the system, also check the radiator
coolant level under the cap. The third item is the intake manifold gasket, check for
seepage. If all these things are good I would replace the thermostat (my S-10 had one
sticking which could actually be seen on the temp gage, it wasn't reaching the normal
195 degrees). If you have the temp gage on your dash watch for low temperature to
indicate a bad thermostat, luckily it sounds as if yours is sticking open as mine did.
Hope this helps.

Mar 26, 2011 | Chevrolet 1500 Cars & Trucks

2 Answers

THE TEMP GAGE FLOATS BACK AND FORTH. NEW RADIATOR,FLUSHED THE HEATER CORE, CHANGED THE THERMO STAT. WHAT NEXT? THE WATER PUMP.


#1 If It's a 2000-2006 GM the stepper motor in the cluster may be the problem.
#2 There may be air in your system. Bleed out the air and the Antifreeze flows a lot better.

Mar 24, 2011 | 1995 Dodge Spirit

1 Answer

I just bought a 1994 Subaru Loyale, the heat is not very hot. The fan blows but the air is warm not hot. The previous owner told me when he replaced the water pump he also put a new 195 degree...


very important to have proper coolant solution.50/50..too much antifreeze will make heater act up.antifreeze tester will eliminate that.warm engine and check both heater hose if they are the same tempature.if not remove both hoses and garden hose through the
heater core to flush both ways.try not to disturb the heat core and remove hoses where they connect to the engine.let me know if that helps

Feb 12, 2011 | 1994 Subaru Loyale

2 Answers

Heater problem with 1994 Suburban. have replaced radiator, thermostat (3 times). Also flushed the system and have run water (via garden hose) directly through the heater core. the flow seemed good. The...


If your temp is jumping between 150-200 degrees then I am guessing you have an air pocket in the engine where coolant should be. The air pocket moves through the engine and when it gets to the water pump, it looses prime and doesn't move the antifreeze which causes it to warm up. Take the radiator cap off the radiator when the engine is cool. Start up the engine and let it run until the thermostat opens up. As the air moves it's way to the radiator it will escape and you will see the antifreeze level go down. Watch it run and as the level goes down add antifreeze until the radiator remains full. Then make sure your overflow tank is up to the required level and I bet your heater works a lot better after that.

Good luck.

Jan 29, 2010 | 1994 Chevrolet Suburban

2 Answers

Engine temp


try skewing the engine coolant temperature sensor with a multi-meter and a temp vs resistance or voltage chart. the ect could be out of range and not set a code. also check actual engine temp with an infrared thermometer. hope this helps

Jan 26, 2010 | 1997 GMC Jimmy

1 Answer

94 olds achieva 6 cyl coolant problem: after startup water temp keeps rising past 195 degrees; as it does i instantly lose my heat. temp will get up to 40 then it drops back to 185 and when this happens my...


a few things come to mind from reading your problem, first your right about the air, it could still have some in it, i know from experance they can be a bear to get all out. secound if your sure you got all air out, the only other thing it could be is a blowen head gasget. third if you suspect head gasget do a coolent system pressure test, and watch for leak down.

Jan 20, 2009 | 1994 Oldsmobile Achieva Special Edition

1 Answer

Cooling & heating?


as a test, restrict a good portion of front of radiator with cardboard. is the engine running at 195 degrees? if engine temp is good, verify that both heater hoses going to heater core are hot. maybe heater control valve.

Dec 05, 2008 | 1989 Ford F 250

2 Answers

Previa Heater Problem


Previa heaters are usually ultra-reliable.
So, regarding your question, the only reason for the temp gauge to drop down with the heater on is the thermostat is sticking open, or you have a lower than recommended thermostat installed. The factory thermostat is a 192 degree F/89 degrees C stat. Down your way, a lot of the parts places vend the "summer" thermostats, and I suspect that this is your problem.
Look to see what the temp degrees that are printed on the stat. Should be 192 F or 89 C. The "summer" stats are 185 F/ 85 C. Also, make sure that your stat has a small "wiggle valve", some aftermarket stats do not have this. Very important. Install the stat with the "wiggle valve" pointing straight up/12 o'clock...
Regarding your trans dropping out od OD, this is because the coolant temp is dropping below 172 degrees F. This is the threshold for the OD to engage. Below 172/no OD engagement.

Sep 22, 2008 | 1993 Toyota Previa

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