changing Thermostat - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum

Red04 6 · 01-16-2013, 10:16 PM

hey guys i need to change my thermostat. i already bout a new one but cant figure out on how to get to the old one. anyone have a good write up on this or point me in the right direction so i can get this changed out soon. any help or advice is thanked!

Mr.Smoke · 01-16-2013, 10:22 PM

V6 or i4?

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Red04 6 · 01-16-2013, 11:10 PM

sorry should have said that! its a i4

Mr.Smoke · 01-16-2013, 11:18 PM

Check out this thread. Some links in there might help ya out.

How to change thermostat

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Red04 6 · 01-17-2013, 07:48 AM

sweet! thanks man!

slatta · 01-20-2013, 11:57 AM

I just did mine this past week. 2005 i4 Mazda 6. And this is my take on changing the thermostat.

1- remove Neg battery cable
2- loosen Pass front wheel
3- jack up car and remove wheel
4- remove plastic inner splash guard over control arm
5- release tension on serpentine belt and loosen belt from power steering pulley
6- locate PS pump on top of Pass side of motor and remove 3 bolts(lower bolt is a strain to get to with lines attached((and pull toward fender))
7- locate T-stat housing below PS and loosen Radiator hose clamps to drain fluid from housing
8- loosen 3 bolts on T-stat housing itself (lower bolt is a strain to get to)
9- replace T-stat (i used my finger to lubricate gasket before install)
10- reinstall all parts in reverse order

Some folks said to run the engine with HEAT on for some amount of time.
I personally burped the hoses, by squeezing them to force any air out of the lines. Then added coolant to system until it stopped forcing bubbles out radiator opening. (This will help to make sure Heater is blowing warm air and not cold air.

Final Impact · 01-20-2013, 01:22 PM

Why are you changing it? Not that we want you to miss this experience, but what tell tail signs say its bad?

Final Impact · 01-22-2013, 09:04 PM

Engine coolant temperature (ECT) sensor
ECT circuit low input (P0117)
• The PCM monitors the ECT sensor signal at PCM terminal 1M. If the PCM detected ECT sensor voltage of 0.20 V or below, the PCM determines that the ECT sensor circuit has a malfunction.
ECT circuit high input (P0118)
• The PCM monitors the ECT sensor signal at PCM terminal 1M. If the PCM detected ECT sensor voltage of 4.58 V or above, the PCM determines that the ECT sensor circuit has a malfunction.

Thermostat
Coolant thermostat stuck open (P0126)
• If the ECT signal never exceeds 71 °C {160 °F} after the engine runs for a certain period, the PCM determines that the coolant thermostat is stuck open.
MONITORING CONDITIONS
— IAT: –10 °C {14 °F} or above
— Difference between ECT at engine start and minimum IAT: 6 °C {43 °F} or below
— Vehicle speed: 6.3 km/h {3.9 mph} or above Coolant thermostat stuck open (P0128)
• The PCM monitors MAF, IAT, VSS and ECT signals and calculates radiator heat radiation ratio while the following monitoring conditions are met. If calculated value exceeds threshold, the PCM determines that the coolant thermostat is stuck open.

MONITORING CONDITIONS
— ECT at engine start: 36 °C {97 °F} or below
— IAT: –10 °C {14 °F} or above
— Difference between ECT at engine start and minimum IAT: 6 °C {43 °F} or below
— Vehicle speed: 9.5 km/h {5.9 mph} or above

JMD902

Red04 6 · 01-28-2013, 01:03 PM

Changed it this weekend! Thanks all for the info and advice!!!

01-16-2013, 10:16 PM	#1 (permalink)
Red04 6 Learners License Join Date: Jan 2013 Location: WI Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	changing Thermostat hey guys i need to change my thermostat. i already bout a new one but cant figure out on how to get to the old one. anyone have a good write up on this or point me in the right direction so i can get this changed out soon. any help or advice is thanked! __________________ 2004 Red Mazda 6 i4

01-16-2013, 10:22 PM	#2 (permalink)
Mr.Smoke Smoke Screen Join Date: Dec 2011 Location: Kitchener, ON Canada Posts: 5,354 Thanks: 677 Thanked 781 Times in 666 Posts Groans: 1 Groaned at 4 Times in 4 Posts Mentioned: 135 Post(s) Tagged: 2 Thread(s) Quoted: 668 Post(s) iTrader: 0 reviews	V6 or i4? Sent from my iPhone using AutoGuide.com Free App __________________ Smoke's Build Thread Ontario Meet Thread Ontario Members Thread CAST YOUR VOTE FOR 6OTM CLICK HERE

01-16-2013, 11:10 PM	#3 (permalink)
Red04 6 Learners License Join Date: Jan 2013 Location: WI Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	sorry should have said that! its a i4 __________________ 2004 Red Mazda 6 i4

01-16-2013, 11:18 PM	#4 (permalink)
Mr.Smoke Smoke Screen Join Date: Dec 2011 Location: Kitchener, ON Canada Posts: 5,354 Thanks: 677 Thanked 781 Times in 666 Posts Groans: 1 Groaned at 4 Times in 4 Posts Mentioned: 135 Post(s) Tagged: 2 Thread(s) Quoted: 668 Post(s) iTrader: 0 reviews	Check out this thread. Some links in there might help ya out. How to change thermostat Sent from my iPhone using AutoGuide.com Free App __________________ Smoke's Build Thread Ontario Meet Thread Ontario Members Thread CAST YOUR VOTE FOR 6OTM CLICK HERE

01-17-2013, 07:48 AM	#5 (permalink)
Red04 6 Learners License Join Date: Jan 2013 Location: WI Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	sweet! thanks man! __________________ 2004 Red Mazda 6 i4

01-20-2013, 11:57 AM	#6 (permalink)
slatta Learners License Join Date: Jan 2009 Location: St. Louis, MO Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	I just did mine this past week. 2005 i4 Mazda 6. And this is my take on changing the thermostat. 1- remove Neg battery cable 2- loosen Pass front wheel 3- jack up car and remove wheel 4- remove plastic inner splash guard over control arm 5- release tension on serpentine belt and loosen belt from power steering pulley 6- locate PS pump on top of Pass side of motor and remove 3 bolts(lower bolt is a strain to get to with lines attached((and pull toward fender)) 7- locate T-stat housing below PS and loosen Radiator hose clamps to drain fluid from housing 8- loosen 3 bolts on T-stat housing itself (lower bolt is a strain to get to) 9- replace T-stat (i used my finger to lubricate gasket before install) 10- reinstall all parts in reverse order Some folks said to run the engine with HEAT on for some amount of time. I personally burped the hoses, by squeezing them to force any air out of the lines. Then added coolant to system until it stopped forcing bubbles out radiator opening. (This will help to make sure Heater is blowing warm air and not cold air.

01-20-2013, 01:22 PM	#7 (permalink)
Final Impact Registered User Join Date: Sep 2012 Location: USA, OR Posts: 1,228 Thanks: 416 Thanked 328 Times in 237 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 23 Post(s) Tagged: 1 Thread(s) Quoted: 194 Post(s) iTrader: 0 reviews	Why are you changing it? Not that we want you to miss this experience, but what tell tail signs say its bad? __________________ 2006 Mazda 6s GS Hatchback, Lapis Blue \| AJ 3.0 & AW6A-EL 6 Spd >79,000 If this post helped you, "thanks" never hurts.. .. ..

01-22-2013, 09:04 PM	#8 (permalink)
Final Impact Registered User Join Date: Sep 2012 Location: USA, OR Posts: 1,228 Thanks: 416 Thanked 328 Times in 237 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 23 Post(s) Tagged: 1 Thread(s) Quoted: 194 Post(s) iTrader: 0 reviews	Engine coolant temperature (ECT) sensor ECT circuit low input (P0117) • The PCM monitors the ECT sensor signal at PCM terminal 1M. If the PCM detected ECT sensor voltage of 0.20 V or below, the PCM determines that the ECT sensor circuit has a malfunction. ECT circuit high input (P0118) • The PCM monitors the ECT sensor signal at PCM terminal 1M. If the PCM detected ECT sensor voltage of 4.58 V or above, the PCM determines that the ECT sensor circuit has a malfunction. Thermostat Coolant thermostat stuck open (P0126) • If the ECT signal never exceeds 71 °C {160 °F} after the engine runs for a certain period, the PCM determines that the coolant thermostat is stuck open. MONITORING CONDITIONS — IAT: –10 °C {14 °F} or above — Difference between ECT at engine start and minimum IAT: 6 °C {43 °F} or below — Vehicle speed: 6.3 km/h {3.9 mph} or above Coolant thermostat stuck open (P0128) • The PCM monitors MAF, IAT, VSS and ECT signals and calculates radiator heat radiation ratio while the following monitoring conditions are met. If calculated value exceeds threshold, the PCM determines that the coolant thermostat is stuck open. MONITORING CONDITIONS — ECT at engine start: 36 °C {97 °F} or below — IAT: –10 °C {14 °F} or above — Difference between ECT at engine start and minimum IAT: 6 °C {43 °F} or below — Vehicle speed: 9.5 km/h {5.9 mph} or above JMD902 __________________ 2006 Mazda 6s GS Hatchback, Lapis Blue \| AJ 3.0 & AW6A-EL 6 Spd >79,000 If this post helped you, "thanks" never hurts.. .. .. Last edited by Final Impact; 01-28-2013 at 05:24 PM. Reason: added search tag JMD902

01-28-2013, 01:03 PM	#9 (permalink)
Red04 6 Learners License Join Date: Jan 2013 Location: WI Posts: 11 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) iTrader: 0 reviews	Changed it this weekend! Thanks all for the info and advice!!! __________________ 2004 Red Mazda 6 i4

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