Question about 2003 Chevrolet Impala

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03 impala 3.8 no heat. how do i install thermostat' thanks

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At the engine end of the upper rad house, there is a housing that holds the thermostat. take that off and there she is.

Posted on Nov 12, 2009

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If the thermostat did not fix the problem then you could have a stopped up heater core (all you need to do is back flush the heater core), it will not allow proper flow across the vents.

Posted on Nov 14, 2009

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Posted on Jan 02, 2017

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SOURCE: heater not heating, but it blows

Sounds like a clogged heater core, try flushing out the whole system and putting in a flushing Tee on to the heater core hose inside the engine compartment, There will be 2 hoses coming out of the fire wall possibley on the passenger side that go into and come out of the heater core, The Tee can take a garden hose connected to it,[3/4"] hose i think ,measure to be safe all you have to do is cut one of the hoses and install the Tee with 2 clamps and attach a hose, first i would attach 1 side to the Tee and attach the hose but don't attach the other hose just yet ,flush out the heater core first then switch the Tee to the other hose and leave off the other hose so that you flush out the core from the other direction and what ever is clogging up the core doesn't go into the rest of the system.then hook up everything and bring the vevicle up to temp and repeat this process [USE ONLY WATER TO FLUSH OUT ] BE CAREFUL NOT TO BURN YOURSELF WITH THE HOT WATER , PUT A RAG OVER THE TEE WHEN DISCONNECTING THE LAST TURNS ON THE CLAMP.Also change out the thermostat under the hood.

Posted on Mar 05, 2009

  • 6 Answers

SOURCE: My 2006 V6 Impala isn't throwing any heat. Could

It could be a number of things not only your t-stat but also an empty reserve tank and even your water pump could be bad. make sure to check all those things out before you go on a replacement spree.

Posted on Jan 30, 2010

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SOURCE: how to replace heater hose bypass fitting on 03 impala

You need to buy the fittings first they are sold by a company called HELP motormite. Very common to go bad. You will need to buy or borrow springlock tool. Are sold seperately or in a set. What they are is a garter spring that will disconnect quick connector on fittings. The parts store will have them too.

Posted on Jun 07, 2010

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1 Answer

Temp gage in my 03 impala goes up when I turn AC on, and transmission acting like it doesn't want to change from 2 to 3 what's wrong?'


Temp gauge going up means your engine is getting hot, lol. Check for worn belt, oil on belt, bad thermostat or water pump. Fix this first, then check for vacuum leaks Have you changed trans fluid and filter in last two years? Ever?

Jul 28, 2015 | AC Cars & Trucks

1 Answer

If my 03 chevy impala is running hot and when i turn it off my car makes a loud noise for a long time


First,I would check the thermostat,could not be opening properly and check water pump.Here's a link on the thermostat.Here's how to replace water pump.

Jan 20, 2013 | 2003 Chevrolet Impala

1 Answer

2003 Impala with 3.4-after replacing radiatior, cap, thermostat and temp sensor temp guage is very erratic swinging from 1/2 to 3/4 all the time while driving. Seems to be a little more tame when a/c is...


I would suggest checking to see if themostat is installed properly and the temp range is correct for your vehicle. You can read more about heating issues in my tips section.

Feb 05, 2011 | 2003 Chevrolet Impala

1 Answer

How to replace heater hose bypass fitting on 03 impala


You need to buy the fittings first they are sold by a company called HELP motormite. Very common to go bad. You will need to buy or borrow springlock tool. Are sold seperately or in a set. What they are is a garter spring that will disconnect quick connector on fittings. The parts store will have them too.

Jun 06, 2010 | 2003 Chevrolet Impala

2 Answers

03 impala 3.4 runs hot and redlines cools when driving fans work also no heat in winter unless driving could these be the water pump


yes and also have your thermostat changed. but heres a way you can check before you buy these things:
#1 car must be cool
#2 let car warm up with hood open
#3 find upper radiator hose and put hand around it...you should feel any water running through it!
#4 after car warms to normal op temp, put hand around hose again and give it a squeeze...it should feel Hot and you should be able to detect a slight water back pressure..this will mean that both your pump and thermostat are working correctly. Also it is imperative that you read my tips and tricks on Dex-cool antifreeze, please, you could save thousands of $$$.

May 19, 2010 | 2003 Chevrolet Impala

1 Answer

Car runs hot


If it was the thermostat, it would run hot all the time. Sounds more like the electric cooling fans are not working. Either the fans themselves are not working, or the coolant temperature sensor is bad and not sending a signal to the computor to turn them on. Have the fans checked first, then go for the sensor if it isn't the fans.

Apr 11, 2010 | 2003 Chevrolet Impala

2 Answers

My 2006 V6 Impala isn't throwing any heat. Could


It may need a thermostat but first always do the obvious make sure that the reserve tank for the antifreeze is 3/4 full, low antifreeze can cause a loss of heat. First check that then do the thermostat. Be sure to bleed out the air from the system look for the bleeder screw it is located at the highest spot on the systems connections usually at the upper hoses housing, unscrew to bleed after the motor has warmed up while running.

Jan 26, 2010 | 2006 Chevrolet Impala

2 Answers

Temperature gauge red lined then dropped back down


more than likely but if the temp gets to high you run an extremely high risk of blowing a head gasket or warping or cracking the head.So have it changed out before driving the car much more and also have the water pump checked.

Jan 02, 2010 | 2003 Chevrolet Impala

1 Answer

Where is the thermostat on 03 impala


If you have the 3.4 v6, just follow the upper radiator hose to the engine. Where the hose connects to the engine is the thermostat housing and it should be right under the throttle body, nice eh. If you have small hands, you can undo the bolt that hold the thermostat housing to the engine with simple ratchet set with a swivel. I think you have have to remove the heat shield from the exhaust pipe to give you more room, can remember. The other way that most dealers do is to remove the throttle body to get enough room to remove the thermostat house, gut your going to have to by a throttle body gasket too. Good luck and hope this helps. The 3.8 is the something, but you have more room and don't need to take throttle body off.

Jun 09, 2009 | 2003 Chevrolet Impala

1 Answer

Heater not heating, but it blows


Sounds like a clogged heater core, try flushing out the whole system and putting in a flushing Tee on to the heater core hose inside the engine compartment, There will be 2 hoses coming out of the fire wall possibley on the passenger side that go into and come out of the heater core, The Tee can take a garden hose connected to it,[3/4"] hose i think ,measure to be safe all you have to do is cut one of the hoses and install the Tee with 2 clamps and attach a hose, first i would attach 1 side to the Tee and attach the hose but don't attach the other hose just yet ,flush out the heater core first then switch the Tee to the other hose and leave off the other hose so that you flush out the core from the other direction and what ever is clogging up the core doesn't go into the rest of the system.then hook up everything and bring the vevicle up to temp and repeat this process [USE ONLY WATER TO FLUSH OUT ] BE CAREFUL NOT TO BURN YOURSELF WITH THE HOT WATER , PUT A RAG OVER THE TEE WHEN DISCONNECTING THE LAST TURNS ON THE CLAMP.Also change out the thermostat under the hood.

Mar 05, 2009 | 2003 Chevrolet Impala

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