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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21106
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have low heat inside the car, i control the water level

Resolved Question:

Hello i have low heat inside the car, i control the water level and hoses in out is hot but bad heating inside car this is grand Cherokee laredo 3,1 TD 2000mod.
Submitted: 1 year ago.
Category: Car
Expert:  Matt replied 1 year ago.
HelloVery first thing to do is ensure the coolant level is up to the mark and if low top it up with the correct antifreeze or pre-mixed coolant as stated in the owners manualI'd then check that the engine is getting up to temperature, if its not then its likely the thermostat needs changing.If this is OK have a feel of the two coolant pipes that pass into the car through the engine bay bulkhead, both should be warm with a warm engine. If they're not then its likely the heater matrix is blocked and you should do a reverse flush on the cooling system to try and clean it out. This is done by removing the top hose from the radiator and placing a garden hose into the engine water outlet, and then run the hose until you get clean water coming out of the radiator.If this doesn't help this only leaves checking out the motor / cable that moves the air mixing flap that allows the hot air from the matrix to enter the car air system. This flap is controlled by the temperature knob / dial etc and I think is controlled with a small motor for your car so the thing to do is first get access to the back of the control knob and measure the voltages is present there, then trace the wiring back into the dash from the control to locate the motor. It’s worth first checking the fuses for the fan / control circuit I'd recommend first removing the glovebox ( undo lower edge hinges from dash) to gain access to the dashboard inner and also allow you to shine a torch to the back of the central console so you can start tracing the wire back and see how things are put together
Customer: replied 1 year ago.
Hello, i have controlled the hose in and out and both is warm but still low temperature inside the car.
I also put an curtain in front of radiator and i can see temperature rising for the engine but the temperature inside is the same. i will follow Your recommandings.
When i turn temperatur Controller to Cold area it coming Cold air inside the car, i have to try flushing the heater.
Expert:  Matt replied 1 year ago.
understood I agree that flushing the heater matrix, independently of the engine is the next step
Expert:  Matt replied 1 year ago.
Hi
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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21106
Experience: BEng hons Mech engineering, in auto industry 22 years
Matt and other Car Specialists are ready to help you
Customer: replied 1 year ago.
Hello matt
thank you for information.I have to take the car at service station, hope they can solve other problem also.Regards
Øivind

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