Hi All

I hope you guys can help I have a problem with a Honda Jazz/ Fit

The bottom radiator hose cold and the top one hot.

I can not see an signs of leaks and there is coolant in the radiator.

There has been no work carried out to the cooling system or I do not think is in the system.

The pipes look to be ok

Please can you give me some advice.

Thank you

 

Doesnt that mean the thermostat is not working?

 

How can I check the Thermostat?

Where is it located?

Cheers

 

http://img23.imageshack.us/img23/3640/1001585s.jpg the lower hoes werer its connects to the block right be low the many on the right side if ur looking at ur car from the front facing it theres two bolts holding it

 

Are you having overheating/cooling issues? If not, don't worry about it.

The bottom hose stays cold if the thermostat is closed, and the thermostat stays closed until the engine reaches a certain temperature. There's simply no need for the thermostat to circulate coolant flow through the lower radiator hose if the engine temp is still below the threshold, it doesn't yet need that much cooling through the radiator.

It's not uncommon for the Fit's thermostat to remain closed sometimes - its tiny engine doesn't run that hot and the factory cooling system is more than sufficient.

If your car is overheating and you notice that the bottom hose never gets cold (meaning the thermostat never opens, even at overheating temperatures), then you probably need to replace the thermostat.

If you want to check that your thermostat is working, just drive the car on the freeway for 5-10 minutes then feel the lower radiator hose. Or just drive it really hard and then feel the hose. It should get hot when the engine gets hot enough for the thermostat to open up. The upper radiator hose will always get hot first.

 

Note: It kinda takes a lot for the Fit's thermostat to open up. You might have to drive hard to get it hot enough.

 

It better be that way. The hot coolant from the engine goes in the tgop of the radiator, passes down through the cooling fins in the radiator and comes out the bottom much cooler than it went in the top and then goes to the 'water pump' (tho its pumping coolant) where the coolant is pumped thru the engine to keep it cool while the coolant heats up and exits the top back to the radiator.
If the lower hose wasn't cooler than the top your engine will be cooked pretty soon.
That help?

 

Do I need to take the radiator out to get to the thermostat.

 

Thank you all for your help.

If my problem is not the thermostat could it be that the pump has failed.

If so how do I check and remove and replace?

Thank you

 

If your water pump failed the car would overheat. What are your water temps? like someone else mentioned the lower hose should be cooler because the coolent had passed through the radiator.

I actually really dont understand what the issues is? what made you worried about this to check it?

 

Yea, what issues are you having? There's nothing wrong with the lower hose being cold after driving, unless you're having overheating issues.

 

This was pointless

 

Most likely the engine and transmission need to be pulled. Are the rear tires hotter than the front? If so, then pull those off too and replace all the interior seats. Let us know how it goes.

 

I read this entire thread again and do not see the point of the question. We have a radiator that takes in hot coolant, cools it down, and supplies it cooler out of the other end. That is what a radiator does.

 

The top hose is HOT and looking like its bulging or over pressurized.
I have removed the hose at the radiator and ran the engine and now water came out.
I am thinking the pump as failed now.
My radiator is not blocked either.
I have removed the bottom hose and connected a hose pipe to it and flushed water through it.
What is my next step please?.

 

Get your car to a shop/mechanic and get her fixed.

 

I want to try to do it myself.

That is why I am asking the questions.

I can not aford the dealer pices

 

Ok then.

The thermostat is about a fifth of the price of a pump so I would go for that first.

The pump looks like a lot more work.

I don't know which Fit you have, Year model etc....but this is fairly common set up.

Go to Bernardi Honda. Punch in your info and it should put you in the ball park.

in the pic below the pump is number 1 and the thermostat is number 4 Both parts would cost you around 150$ Canadian money with the seals and taxes.

 

How do I check the thermostat?

 

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Found this page from the UK.

150 of your pounds for both.