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My heat on my 2002 blows hot on low but gets cooler as I turn it up, new radiator, coolant good, heater core flushes, new thermostat.

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  • Cars & Trucks Master
  • 3,679 Answers

Sounds like water pump

Posted on Nov 09, 2014

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Posted on Jan 02, 2017

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SOURCE: The heat in my 1992 Jeep Wangler is not working.

The only reason it won't blow hot air is because the water is not getting to the heater core. Check to see if you have a heater control valve in one of the two lines to the heater core. If so check to be sure that is is opening and closing. If it won't open then you get no water flow in to the heater core.

Posted on Feb 07, 2009

dennymulford
  • 1055 Answers

SOURCE: heater doesnt get hot

is their a control valve in the heaater hose?
if so it could be stuck

Posted on Mar 04, 2009

alicantecoli
  • 22265 Answers

SOURCE: new pump, thermostat,full,bled,no heater,still runs hot

head gasket??

Posted on Dec 31, 2009

  • 30 Answers

SOURCE: Heater blows only luke warm air.

check control swicth

Posted on Feb 12, 2010

  • 635 Answers

SOURCE: replaced thermostat and flushed out heater core 3

If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.

remove radiator cap

Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.

Start engine with cap off

Wait till engine gets hot

While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop

Fill the radiator with more coolant to compensate.

When the fans come on and it stops gurgling air install the radiator cap

You are done

Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.

Your heat should be very hot now providing you installed the correct oem thermostat correctly.

Hope this helps

Posted on Mar 31, 2010

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If there is no heat and air is blowing out check your radiator level. If the engine coolant is too low water will not get to your heater core. Remeber check the radiator level and not just the coolant reservoir. Becareful when working around a hot car. wait til the car cools down to check the level of the coolant in the radiator.

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