Backfire and Over heating

[Paul Hussey]

Well would you believe it a lovely weekend like this
and guess where the wedge is? stuck in my garage am
not happy.
Am after some advise can anyone help?
350i is getting far to hot to quick and even when i flick the swith for the fan it still stays near the red
Does this sound like a water pump if so where is the best place to grt one at a reasonable price.
Secondly when i rev her hard at around 4-5000 rpm it back fires everytime wots that all about.
I have only just got it back from the mot and want to
start enjoying driving the beast.
Cheers
QPR WEDGER

[GreenV8S]

Is the fan actually coming on? Does it cool down again when you get moving above 50 mph or so? Have you checked the water level and bled the engine and radiator?

[Paul Hussey]

Yes the fan works fine the temp does come down slightly when cruising at 50 but only by a bit and thats with the fan on constantly have also checked fluid levels and blockages all ok there too.
Have just this week replaced fan belt to as old one was slipping.The water pump has a grindy noise to it.

[HeyAndy]

Could be an airlock. But I'd check the thermostat to make sure it's opening ok.

If your car is backfiring your timing may be out which may also account for the overheating.

[mikeb]

Could have overtightened the alternator belt???.

Check to see if there is any play in the water pump shaft.

MikeB