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2012 kw t800 i have no heat in cab the fan blows full go at start up and stays full go all water valves are open i just replaced water temp sensor and the guages in cab water and tranny not showing te

2012 kw t800 i have no heat in cab the fan blows full go at start up and stays full go all water valves are open i just replaced water temp sensor and the guages in cab water and tranny not showing temp, and all coolant lines are cool the a/c is off please help

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  • Cars & Trucks Master
  • 579 Answers

You didn't say anything about changing the thermostat. I think this may be your problem. Also check your fluid level , there may be an air pocket in the system. GOOD LUCK FRIEND.

Posted on Nov 08, 2014

Testimonial: "would that make the fan blow full go from start up"

  • dannydoesita Nov 08, 2014

    The fan may be a separate issue, find out why you have no heat first. I think that your thermostat is stuck wide open, i.e. not allowing coolant to warm up to tempurature.

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6ya6ya
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chazman05
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SOURCE: 1996 ford contour gets hot , no hot heater or temp guage movement

Is your temperature gauge working now? That is of more concern then your heater as you wouldnt know if your engine was overheating until its too late. Your heater core could be clogged, they get clogged quite easily. You can flush them or replace. The part is inexpensive but on some models you have to take out dash to replace them, but on other models it only takes about 30 mins and a few bolts.

Posted on Dec 17, 2008

chain saw
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SOURCE: Audi A3 2001 fan running all of the time, Temp

ON ALL A4 MODELS AND I THINK THE A3 , THE ENGINE COOLANT TEMPERATURE SENSOR IS LOCATED AT THE REAR OF THE CYLINDER HEAD,WHILST ON SOME ENGINES, A SECOND SENSOR IS FITTED TO THE RADIATOR OUTLET PIPE...HOPE I WAS OF SOME HELP TO YOU....

Posted on Feb 24, 2009

wyatt1582
  • 453 Answers

SOURCE: cooling temp sensor

Should be located on the lower intake on right or left toward the front. Two wires watch cause there's and air temp that might look the same.

Posted on Mar 26, 2009

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SOURCE: 2005 buick allure temp guage shows 0 and both cooling fans run

coolant temp sensor defective. look through manual for location of this sensor.

Posted on Apr 16, 2009

  • 1071 Answers

SOURCE: GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading

there are 2 coolant sensors one for gauge and one for ecm

Posted on Jul 23, 2009

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2 Answers

I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
remove the rad cap from the rad, start the engine and let it run until the coolant drops (add to fill it back up) or until the coolant boils out of the rad spout.

maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

Mar 12, 2015 | 2002 Dodge Grand Caravan

2 Answers

My cooling fans turn on as soon as i start my van.. fan wont blow heat in the cab either


Could be low on coolant, or an electrical problem with the coolant temp sensor.

Feb 26, 2015 | 2007 Pontiac Montana

1 Answer

199 oldsmobile alero temp light stays on


Well the light staying on could be a short in the wiring or a failed temp switch. And that could affect the radiator fan but I doubt it.
Have you checked the water pump and thermostat ? Is coolant flowing in the system ?

Feb 23, 2014 | 1999 Oldsmobile Alero

1 Answer

No heat blowing from vents


no fan, on high? or no heat , fan at full speed.
if fan blows , it can only be 2 things,
1: engine not at 180F or holding.(min, temp)
2: water valve or damper stuck. (and there respective controls)

Nov 27, 2013 | Jeep Commander Cars & Trucks

2 Answers

Heat gauge goes way up,then by reeving motor it will go down.blows cold air


Check out related help links with solutions to troubleshoot the problem:---
Click the link below:---
2004 Toyota Tundra: Oil Gauge and Temp Gauge Not Working?


http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html

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Toyota 4Runner: Temperature Gauge Sensor http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html

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Temperature gauge sits over half way mark? http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
----------
Heater blows intermittently and temp gauge goes erratic?


http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
------------- No heat on Oldsmobile Silhouette? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html
-------------
Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
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Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
----------- Temperature gauge on the dash quit working on Pontiac Grand Prix? http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
-----------
Dodge neon gauges not working? http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html

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Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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1992 Lexus LS400: Engine overheats, Antifreeze out of reservoir and heater Blows Cold Air? http://whatisbyme.blogspot.in/2012/05/1992-lexus-ls400-engine-overheats.html

-----------
These details will help.
Thanks.

Nov 22, 2012 | 1997 Ford Taurus

1 Answer

Heater doesnt work


To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

--------
Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------
Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

-----------
No heat on car? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------
Heater blows intermittently and temp gauge goes erratic?

http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

------------
Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

---------
Heater/AC blower motor not working?

http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html

------------
A/C, heater, defroster fan, not working? http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html Heater problem?

http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html

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This will help.Thanks.

Mar 27, 2012 | 1994 Volvo 960

1 Answer

No heat I have changed thermostat,blow air thougt


I had this exact problem. Suspect a clogged heater core and you will probably have to replace it. Make sure you have the valve that opens the heater that works. You can remove it and see if it works. The valve is a vacuum valve that is connected within 10 inches of the 2 firewall heater hoses.

If the valve opens and stay opens and passes water well then disconnect the output of the heater and verify the that water flows well and you may be ok with the heater core being ok.
I know you do not like to hear but with all these tests, you should replace the heater core in the cab. It is a pain to remove but doable.

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Sep 20, 2011 | 1992 Dodge Caravan

2 Answers

2003 Buick Century is over heating in the morning only. Radiator, thermostat and sensor have all been replaced. Water pump and fans have been checked. When it idles it gets hot but when you rev the motor...


Sounds like the intake gasket or even possibly the head gasket have gone south if everything else has been replaced. Internal engine leaks will cause engine to overheat very easily.

May 19, 2010 | 2003 Buick Century

3 Answers

My temperature gage is going over in the red and my heat is not


Check the sensor which controls the cooling fans that cools the radiator it prevents the engine from over heating and allows the temp gauge to stay at normal range.recently had problems with my 2003 impala overheating it was the sensor had the thermostat replace as well.

Feb 10, 2010 | 2003 Chevrolet Impala

2 Answers

4.6 liter has one heater hose warmer than the other. may be plugged core,or is ther a fuse to climate control switch?


Look for a heater valve on one of the hoses if there is no valve i would say its a plugged heater core.

Dec 11, 2009 | 1999 Ford F150 Regular Cab

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