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Good to know, thank you. I told my mechanic not to replace them.

Thank you for your response.

Hi everyone I need some advise. I'm having work done on my 2004 V8 90k miles and my mechanic asked if I would like him to replace the knock sensors while he has easy access. Are these the type of parts you should replace if you can or if they ain't broke then don't fix them? If they should be...

I agree with Joegr. However, based on what I have learned dealing with my car(2004 V8) and your symptoms it sounds like a bad thermostat and/or thermostat housing to me. You can't go wrong with correctly replacing it all but If you want to try to get away with the minimum then I suggest the...

In those instances when the car did overheat do you recall hearing the cooling fan? The cooling fan will kick into a high speed at about 226 degrees and max in the 230's. The sound the fan makes is very noticeable.

Sounds like good news! Was there anything noticeably different or wrong with the aftermarket housing or t-stat?

Just curious what year and engine? My 04 V8 owners manual lists "Motorcraft Premium Gold" coolant or equivalent meeting Ford specification WSS-M97B51-A1. If you are looking for an alternative to the Motorcraft then Valvoline Zerex G-05 meets Fords specification and is gold colored as well...

Hot coolant is coming out of the engine into the upper radiator hose where it kinda gets backed up waiting for the thermostat to start opening(190 degrees) so it will get hot. Let the car run until temp gets to 220 then turn the car off. Check the temp of the lower radiator hose by reaching...

If you want to replace the aftermarket housing and thermostat with OEM these are the parts pulled from Rockauto. 1. Thermostat Housing = MOTORCRAFT RH134 {#2C3T14B060BM, 3W438594AB, 3W4Z8592AA} W/ Connector, Water Outlet Hose; W/O Thermostat Housing 2. Thermostat = MOTORCRAFT RT1163...

If it was me I would start at step #1 and move through each step in order.

First allow the engine to cool and the system to depressurize. Then, follow the air bleed instructions as written. You shouldn't lose coolant by opening the engine fill cap. If your coolant level is currently fine then you wont need to add much to the degas but go through the step anyway.

I've seen an LS aftermarket housing where the coolant flow opening diameter is considerably smaller than the opening in the OEM housing and another that looks like it's missing the small valve that's located on the inside of the OEM housing. This might explain why some experience "marginal...

I think 226 is too hot. What you are hearing is the fan kicking into high speed. If it is OK for me to assume the following: 1. There are no internal engine problems 2. All coolant parts show no signs of cracking and or coolant leaks 3. The coolant system has been correctly bled of air Then...

If the fan is running at high speeds then the temperature is climbing well over 220 degrees. It's my impression that If the cooling system is in order this shouldn't happen. If you haven't already you may want to read my post "Overheating Root Cause". If you have an OBD II scanner tool monitor...

I agree unfortunately I know what lurks ahead.

I figured that to be the case so I have all parts but for a degas ready to go and all are OEM. I've enjoyed some great threads here on the subject. However I'm wondering if the thermostat restricting coolant flow is what begins the degrading process. If the housing issue I mentioned occurs...

80k

No I didn't sorry. I wasn't planning on posting but the more I thought about it I thought it to be interesting as well. If you like watch this video. At 15mins. 15secs. there is a good view inside the OEM housing. The gold colored cup-like washer is what the thermostat pin inserts into. That is...

I finished working on my 2004 V8 overheating problem a few days ago and think the root cause is worth sharing. The following is based on OEM parts. I am a novice so I hope this makes sense. Inside the thermostat housing the thermostat pin inserts into a hole that is on top of a column which...

My '04 V8 is making the exact same whistle noise. Were you able to pinpoint the cause?