Question about 2001 GMC Jimmy

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Heater is not heating proper ..i changed the thermostat ,,and the oressure cap,, still is not right ,,air conditioner is not working right either ,,,is there a damper not changing proper or what do you suggest

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Sounds like the compressor or the heater core.

Posted on Mar 18, 2011

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Has very little heat has new thermostat!


Was the heater working ok before you fitted the new thermostat?
If no, you probably have a blocked heater matrix. That means you have to either try flushing the coolant system to remove the blockage .. or.. replace the heater matrix, which isn't an easy task.

If the heater was working ok before you changed the thermostat then it's likely you still have air in the system.

Set the heater controls to hot, remove the radiator cap/coolant bottle cap and start the engine. Let it tickover and warm up. Hopefully any trapped air will be purged from the cooling system.

Are you sure that the thermostat is okay? Thermostats have a small valve in that allows air to pass through. If your thermostat is mounted like a clock ..i.e .. the face looking out - the air valve must be at the top.



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Feb 06, 2016 | 1996 Nissan Quest

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2000 chevy impala overheats i think its something electric


I doubt its anything electric.
Are you sure the radiator is full of coolant ?
Do both radiator hoses get hot when the thermostat opens at 195 degrees ?
Do both heater hoses get hot after running the engine for 5 min ?

Feb 06, 2013 | 2000 Chevrolet Impala

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How do you properly bleed the coolant system on a 1994 Toyota Celica 1.8 stx?


If even possible, it sounds as though your water
pump is not turning the right way

It isn't even moving any water & that is all
you worked on, unless the thermostat somehow
could go in backwards

Nov 17, 2012 | 1994 Toyota Celica

1 Answer

I just installed a thermostat in my 2000 lincoln ls and now the heater and defrost dont work. heater just blows out cool air


make sure you installed the themostat the right way and that it has the proper heat range for your vechicule.normally after installing a thermostat,you remve the rad cap and fill the radiator with antifreeze,then srart the car and wait till the themostat opens and prestone level falls.refill rad and put rad cap back on.turn on heater and you should have heat,if not have your rad cap tested to make sure it is holding the proper pressure.your antifreeze mixture should be 50\50.

Nov 04, 2012 | Cars & Trucks

1 Answer

Flushed radiator. Changed thermostat because prior to flush. engine wasn't heating up properly. During drive, the 1st step in flush procedure, engine heated properly and heater worked properly. Drained and...


Air in the system. Run the engine with the cap off, rev the engine up and this will help purge the air. Fill as needed and keep check on it for a few days.

Jan 22, 2011 | 1995 Jeep Grand Cherokee

2 Answers

Blower working but dont have no heat i changed the thermostat still not working im hoping its not heating core any suggestions


if the cooling system is not clogged and the water pump is ok then there may be air trapped in system, bleed air from system if need be. if air is trapped in system you will not get any heat. start car let it run take cap off of coolant tank then find bleeder for the coolant system, open bleed screw and air may be trapped in system.make sure coolant is at a proper level. do not forget coolant tank cap when done.

Nov 21, 2009 | 1999 Ford Taurus

1 Answer

Heater does not work


Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.

Dec 22, 2008 | 1998 GMC Sonoma

5 Answers

Heater blows cold air


the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation dodgeboy6069@yahoo.com

Jul 19, 2008 | 2004 Jeep Wrangler

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