Simon,
If the engine is running but not getting up to proper running temp,
1. The thermostat is stuck open.
2. Replace the thermostat with one that opens at 190 or 195.
3. You have too much radiator exposed, block some.
4. Your temp sender or gauge don't work properly.
5. Replace the radiator cap, it may be leaking.
6. Check all hoses and the water pump for leaks.
7. Review and follow the cooling system diagnostics in a shop manual like
Clymer's.
That should cover and correct 99% of cooling system faults. I'm anxious to hear
your findings in case you have something new to add to the list of potential
causes.
Jim
Simon Matthews wrote:
> Jim,
>
> Exactly how would this help **too much** cooling?
>
> The problem with my car was not lack of heat from the heater, but the engine
> running too cool. If I got the engine up to temperature (by blanking the oil
> cooler and part of the radiator), the heater worked fine.
>
> Simon
>
> >From: "James H. Nazarian" <microdoc@apk.net>
> >To: Simon Matthews <simon_atwork@hotmail.com>
> >Subject: Re: Decent Heat
> >Date: Mon, 18 Oct 1999 14:07:17 -0400
> >
> >Back flush the cooling system!
> >
> >Jim
> >
> >Simon Matthews wrote:
> >
> > > Charley,
> > >
> > > Your assumption about my thermostat is not correct. I replaced and
> > > checked the thermostat several times. This was the obvious item to look
> >at
> > > first and I did look at it. I had fitted a 180 degree thermostat.
> > >
> > > If I recall correctly, early Bs did not have the oil cooler -- does
> >yours?
> > >
> > > Also, hot (warm) water is circulating through the heater matrix
> >irrespective
> > > of whether the thermostat is open or closed. This will provide cooling.
> > >
> > > Have you made any other changes from original (electric fan, perhaps)
> >that
> > > would help cold weather performance?
> > >
> > > Simon
> > >
> > > >From: Charley & Peggy Robinson <ccrobins@ktc.com>
> > > >To: Simon Matthews <simon_atwork@hotmail.com>
> > > >CC: mgs@autox.team.net
> > > >Subject: Re: Decent Heat
> > > >Date: Fri, 15 Oct 1999 15:11:03 -0500
> > > >
> > > >Hi Simon,
> > > >
> > > > I'm afraid you've drawn the wrong conclusion from your expreience
> >with
> > > >the '74 B. I have a '69 B that comes up to temp and puts out plenty of
> > > >heat in sub-freezing weather. You probably had a 160 degree
> >thermostat,
> > > >or maybe none at all in the engine which kept it from warming up more
> > > >than that.
> > > >
> > > > The thermostat opens at its preset temp (approx) and that's as cool
> >as
> > > >the engine can run. After that the engine temp is up to the cooling
> > > >system in whatever driving conditions are encountered.
> > > >
> > > > Charley Robinson
> > > > '69 B
> > > >
> > > >
> > > >
> > > >Simon Matthews wrote:
> > > > >
> > > > > Pre-'75 cars will not come up to temperature in cold weather,
> >whatever
> > > >the
> > > > > thermostat -- remember the oil cooler is also providing engine
> >cooling
> > > >and
> > > > > some water goes past the thermostat.
> > > > >
> > > > > I know this because I drove my '74 MGB (US spec) 70 miles during one
> > > >trip
> > > > > when the temperature gauge barely moved off the low mark.
> > > > >
> > > > >
> > > > > Simon
> > > > >
> > > > > ______________________________________________________
> > > > > Get Your Private, Free Email at http://www.hotmail.com
> >
> >
>
> ______________________________________________________
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