Hot under the hood

I've never even heard of that happening. All of the underhood equipment is designed to tolerate high temperatures, if you're insulating things, you're masking whatever fault exists rather than fixing it.

I guess the relay for the air con was the issue as I turned off the fan so it wouldn't run the battery low . An auto electrician suggested it should be on all the time when the air con is on in summer . But it sucks the power out put of the battery . I since have beefed up the earthing wires and connections which seems to have helped .I am not on r12 I am on 134a which is less efficient . Once I turned the fan back on all seems well . I will not know till the next traffic snarl on a hot day . It seems there is a connection between brakes air and heat under the hood .

I would take a look at the ABS controller and/or relay, assuming the car has ABS. One of those might have some cracked solder joints or a component that has become heat sensitive.

The conditioner compressor is powered by the engine. You also have alternator to supply the power when the engine is running.

Regards,

Boris Mohar

Got Knock? - see: Viatrack Printed Circuit Designs (among other things)

void _-void-_ in the obvious place

I think he's talking about the auxiliary electric fan on the condenser, that draws quite a large load. I believe it normally only comes on when the condenser temperature rises beyond a certain point.