Question about 2002 Jeep Grand Cherokee

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Sometimes the heat is working, sometimes not,

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Check your thermostat it is located usually inside the throttle body the main hose running from the engine (throttle body).. And or check for low antifreeze or both.

Posted on Feb 06, 2010

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My heat only works sometimes. One time I will start it and it will come right on, the next time it wont. If I hit a bump it will sometimes come on till I shut the car off again. Any ideas?


When you say heat only works sometimes are you talking the blower fan only running once in a while if it is the fan your talking about it sounds like a loose connection either on the switch or possibly on the blower mother itself

Dec 03, 2014 | 1996 GMC Jimmy

1 Answer

1999 isuzu amigo heat works sometimes and not others


Check engine temperature, fan operation and thermostat.
Also check inside blower operation. If intermittent, then check and/or change the blower motor.

Nov 18, 2012 | 1998 Isuzu Rodeo

1 Answer

Heat sometimes works in 2003 envoy


First I recommend checking that your coolant level is good. Please check this cold so you don't risk getting burned. I have seen too many heater complaints where the coolant level was simply too low to fill the heater core. Next, you should check if the heater control valve is operating. I don't have any GM experience, but heater valves are often the cause of intermittent heater operation in many cars. Good luck!

Dec 20, 2011 | 2003 GMC Envoy

1 Answer

Heater fan Switch works sometimes sometimes it does not


There are two possible causes for this problem. If you meant the blower sometimes works and sometimes doesn't, you most likely need a new resistor it is an easily replaceable part, located below the glove compartment on the passenger side, inside the cab. If you meant that the switching from defrost to heat and vice-versa only sometimes works, your problem is most likely a vacuum leak. There is a hose that originates from the front bumper and controls things like whether you have heat or defrost, as well as cruise control and a few others. Often you can find the leak by spraying soapy water on the vacuum line and simply taping up the leak, or by replacing the (inexpensive) vacuum hose.

Hope this helps!

Jan 24, 2011 | 1999 GMC Suburban

1 Answer

Heat sometimes works and sometimes doesnt


Make sure that your antifreeze is up where it should be.

Oct 18, 2009 | 2007 Chevrolet Aveo Sedan

1 Answer

1998 Isuzu Hombre heater works sometimes, sometimes doesn't


Sounnds like a thermostat sticking open at times, or, the temperature regulator inside the vehicle is malfunctioning.

Mar 27, 2009 | 1998 Isuzu Hombre

1 Answer

1998 S10 heat wont work sometimes


When you say the heat doesn't work are you meaning the fan doesn't blow out hot air or just doesn't blow out any air? if it blows cold air sometimes when you have the heat on then it could be poor circulation through your radiator or a weak water pump. make sure your radiator is clean on the inside, not too corroded or nasty inside. You can buy a radiator flush thing from wal-mart or any auto parts store. See if it helps.

Mar 01, 2009 | 1998 Chevrolet S-10 Pickup

1 Answer

Heat in my 94 Toyota Tercel has a problem and so does the ignition.


warm your car up to temperture. Grab the upper rediator hose. Is it warm or cool. If its cool your thermosat is stuck closed and thats why you have no heat. If that works fine I would look at your heater core next.

Oct 21, 2008 | 1994 Toyota Tercel

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