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Overheating again

 
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  #1 (permalink)  
Old 13 Mar 2018, 05:34 am
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Location: Bexleyheath, Kent, UK
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Default Overheating again

I have read through quite a few threads on this and just not sure what to do.

I originally, a few months ago, had a leak around the plastic valve assembly in the heater line, supposed to be there to prevent noise rfom water bubbles! Anyway I replaced this with a straight piece of metal pipe and it sealed.

Since then it has overheated a couple times, last time this morning on way to work. It seems to be dumping the watre out of the expansion tank overflow. I am pretty sure that if I fill it up again it will run for another period without overheating.

I have replaced rad cap and thermostat and when it is behaving the tempearture gauge sits rock solid on mid way on the gauge.

Any suggestions as to what I might have missed. I cant see any other leaks from anywhere else.
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Old 13 Mar 2018, 07:31 am
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Default Re: Overheating again

Are you sure you got all of the air out? You might try parking it overnight with the right side of the car raised a few inches higher than the passenger side and the radiator cap off. This will help to bleed any residual air out of system. Then you lower the car and top off the coolant and put the radiator cap back on.
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Old 14 Mar 2018, 05:25 am
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Default Re: Overheating again

Interesting, had not thought of that. I know can be a problem getting air out.

It looks now as though it might be the fan motor/relay. I replaced one on my wifes PT some years ago. Then I just replaced the motor but it is just as cheap now to replace the whole assembly (in UK) price of motor is actually 2 more expensive than the whole assy!

Can anyone confirm that the fan will always come on if air con is switched on or does it depend on temperature of outside air and engine. This would be a quick easy test to find out if the fan is not cutting in at least.
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Old 14 Mar 2018, 06:32 am
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Default Re: Overheating again

The fan is two speed, low speed for radiator cooling with out the AC or defroster in the on position

High speed for engine cooling and keeping the AC condenser cool enough to keep freon pressure in its
operating range and for the AC compressor to compress the gas back into a liquid to be evaporated again to cause cooling inside the car.

The brushes for the low speed could be at the end of their life cycle and not making contact intermittently,
this is noted by being stopped or in slow traffic -overheating. Car should not over heat at speed over 35 mph due to sufficient air flow into the radiator.

The high speed would still work when the compressor for the AC is on.

another possibility is the wiring harness connector could be damaged by internal heat cause by a loose connection
and continuous cycling of the fan by the PCM to keep engine coolant at correct temperature to maintain engine
temperature providing the thermostat is work properly and coolant level is maintained at correct level.
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Last edited by JoeX; 14 Mar 2018 at 06:39 am.
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Old 14 Mar 2018, 07:29 am
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Default Re: Overheating again

Quote:
Originally Posted by Jassy View Post
Interesting, had not thought of that. I know can be a problem getting air out.

It looks now as though it might be the fan motor/relay. I replaced one on my wifes PT some years ago. Then I just replaced the motor but it is just as cheap now to replace the whole assembly (in UK) price of motor is actually 2 more expensive than the whole assy!

Can anyone confirm that the fan will always come on if air con is switched on or does it depend on temperature of outside air and engine. This would be a quick easy test to find out if the fan is not cutting in at least.
Yes, when you turn the a/c on, the low speed fan SHOULD come on within a couple of seconds.
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Old 14 Mar 2018, 10:31 am
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Default Re: Overheating again

Thanks again guys for your help.
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Old 14 Mar 2018, 12:02 pm
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Default Re: Overheating again

Quote:
Originally Posted by chuzz View Post
Yes, when you turn the a/c on, the low speed fan SHOULD come on within a couple of seconds.
You should do this when the engine is cold.
chuzz likes this.
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