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Discussion Starter · #1 ·
Hi all, I've just noticed my temp gauge is heading straight up to v high right after I switch the car on - then staying there. The car only went about 100 metres, but the block was cool to the touch - what gives?
Any help much appreciated

r
 

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temp

If you are sure that you are not overheating, that you have enough coolant (esp. inside the radiator), and that your temp gauge and thermostat are working properly..... I would suspect that it is the sender/thermo unit located near the throttle body. This is a $32 part and easy to replace. Let me know if you need more info. I had this happen to me and thought I was going to crack a head.
 

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Discussion Starter · #3 ·
coul i have cleaned it to death?

I just degreased the entire engine bay on the weekend, and haven't diven the car that much, I was pretty carefull with plastic bags and gaffer tape around the sensitive bits, but is it possible I shorted out and toasted the temp sensor - it looks kind of vulnerable sitting up like that?

Is it possible the little tacker will 'dry out'?
 

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Now that I think about it, I cleaned my engine not too long before my sender went out. But it was at least a couple of days in between the two events. So I would say that it was unlikely that your cleaning shorted it out.

I'm sure that by the time you read this everything will be dry.

When you pull the connector/cap off the sender, are the wires in good condition and is the connection good?
 

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Discussion Starter · #5 ·
that's a coincidence

token7888 - your sender unit went out a few days after a clean too? That may be what has happened to mine? not sure...

I checked the connection to the temp sender unit and it was cactus - the brass was corroded and I put the problem down to this. cleaning it up with wet dry didn't help much.
Called honda - can't buy the connector cap individually - reccommend new wiring harness ($$)
Called local auto elec - put a new connector cap on for free.

Previously the temp gauge read v high on a cold start, after cleaning the connector it read half way on a cold start and read just under the red at operating temp (cooling fan on twice, then a short drive).
After getting the new cap fitted the temp gauge then read a little over half way on the drive home - engine warm, but as I got to the driveway it went up to high.
I'm not sure whether I should replace the temp sender unit or not, or whether the car is overheating
anybody got any ideas?

rich
 

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Hey Rich,
You can check the sender with a digital multimeter (maybe the guy that fixed your connector can do it if you don't have one). The Helm manual has directions.

When my gauge shot up I was already on the freeway and stopped twice to check the underhood temp. No boiling coolant in the reservoir, the fans didn't come on, and I could hold onto the coolant return hose (for a couple of seconds anyway). Just in case, I ran the heater on high to bleed off heat into the cabin. I don't recommend you run if it is really, really getting hot because warping a head will be $$$$$$.

Like I said, if you think everything else is ok with the cooling system. Check or replace the sender, it's only around $30. By the time a mechanic opens the hood to even take a look, that will be $60 where I live. (I had the thermostat replaced too for peace of mind, but it did not turn out to be broken.)
jy
 
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