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MG MGF Technical - Embarrassing Heating Question, but…


When you put the interior heating control on full… is all the heat solely generated from the Engine Temp/Coolant? I.e there is no “supplementary” heating bit that kicks in.

I do a lot of motorway driving ending in stop/start traffic… and to help the poor old, hot, engine I often have the interior heater blowing skywards… so the oil temp stays cooler.

Is this logic right for the MGF?

Many thanks
Francis.
V272 ROH
Francis

The heater is straight off the water circulation before the thermostat (so that the heater works before the radiator starts to be needed and the thermostat opens)

It SHOULD improve engine cooling marginally, but as you may have observed, because the heater matrix is several feet from the engine, there's often not enough "circulation pressure" to heat it when the engine is only idling in traffic.

Also, when you come into traffic at the end of your fast section, the main thermostat should be fully open, allowing full flow to the radiator, which can (and may well) need the fan to provide additional air movement.

All in all, I think "extra warming" of the cabin - particularly in this weather(!) - is of marginal benefit at best.

(there are various oil coolers being investigated by other people and if you're particularly worried, one of them might be called for - they are a heat exchanger that fits between the oil filter and the engine - complete with a thermostat again to prevent excessive cooling)

Neil
NNW 49
Neil

Hi,

It depends what you mean. All the heat, of course, comes from the engine. There is a pipework loop to the front radiator, and a smaller separate loop to the heater radiator. There is also a bypass hose from the cyl head take-off manifold to the thermostat housing, and a breather pipe from the heater loop to the expansion tank. When the heater valve and thermostat are closed the water circulates though the bypass hose and the breather pipe. The radiator is man enough to cool the engine when the thermostat is open, but obviously some heat is exchanged by the heater when the heater valve is opened. I don't think that the engine will run any cooler when the heater valve is opened (unless the temp gauge shows that the car is overheating). However I always run my car with the heater valve open, especially from cold when the thermostat is closed. (OK, I do close the valve occasionally when the car and the weather are hot.) I believe that this might reduce the possibility of air-locks, and will reduce the flow though that annoying breather pipe (which I dislike), but this is just my hunch!

Regards, Kes.
Kes

I am following Kes.
The switch of the blower is always on 1 in my car. A salesman of Rover advised me to do. I have learned from previous threads that this stimulates the water flow, and this could (?!?) prevent a HGF. I don't think this has an impact of such a great level on the engine temperature.
Another thing, the temperature can be dropped by installing a K&N, exhaust system and/or cat bypass.

Cheers,
Erik
Erik

Francis,

Don't worry about the oil temp readings on 2000MY cars. There is a mismatch between the sender and the gauge and all over read by what appears to be about 20 to 25 degrees.

A modification should be on it's way once minor matters are dealt with, such as sorting out who works for whom (Phoenix/BMW/DHSS) within the overall organisation.

Rog
Roger Parker

Guys

As always your marvelous. Thanks for your replies.

Francis



Francis

This thread was discussed between 19/06/2000 and 20/06/2000

MG MGF Technical index

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