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[johnboy]

OK, I seem to be putting up posts all over the shop; this one is about my heater.  As I recollect from US tin I have owned in the past the heaters had the output of a blast furnace.  

The one in the Jeep seems weedy in the extreme, noticed that the engine temp. gauge is reading what I assume to be just over 70 (a little over the first bar), this seems cool to me and I was wondering if a. the thermostat was sticking open, b. the heater core is knackered - I am sure before the cold snap the engine temp. went higher but when your checking out the aircon, heat ain't what you look at!  

Any ideas out there!

[JamesH]

The heater should be roasty when all working properly.

Engine temp should get up to around 100 pretty rapidly. I'd check thermostat, you'll probably rip the paper gasket getting it off - I'd recommend just getting a new t-stat with gasket as they're cheap. Don't over tighten the bolts when refitting as the t-stat housing can crack quite easily. Beyond the thermostat I'll leave other to advise you.

[johnboy]

Thanks for that - I'll give it a try.

[Mike Pavelin]

Yup, the thing should run just under 100C. While you're changing the thermostat, thoroughly flush the cooling system and don't forget some fresh antifreeze.

[johnboy]

A bit more on the heater - got stuck in traffic yesterday (Toytown is a hell hole) temperature went up to just below 100, warm and toasty.  The thermotwat is obviously working but it seems she doesn't get hot enough to open it.  Getting hot enough in traffic so why doesn't it warm up on a fifteen mile trip up the motorway?  Thinking of putting blinds across the radiator - anyone else had this problem?

[Mike Pavelin]

Thermostat's probably stuck open then. This would cause the engine to run too cool, the heater not to work properly, and you'll be using too much fuel as well.

[The Smiths]

Can I jump in and ask if the temperature should be the same on the 2.5TD (1995).

These problems seem the same as mine:
Temp guage sat just over the 70 mark
Heater is very poor (now becoming a problem with temperatures dropping).

The temp does not increase above this mark though - even in summer (the 2 days of it we had), traffic or anything else.

Cooling system absolutely clean, after changing water pump.

[Mike Pavelin]

Could be. Also check the viscous fan coupling isn't siezed solid.

[The Smiths]

Could be. Also check the viscous fan coupling isn't siezed solid.

Fan coupling does turn OK, well I presume OK because it isn't siezed.

I am unsure about opening temperature because the only reference I have is a workshop CD that says 80C for the thermostat on a diesel. It also says 90C for petrol.

I've proven the CD wrong on other occations - but it's better than nothing .

[PJinUK]

mY 2.5 td did the same.It was an airlock in the rubber pipe over the engine.I undid both hoses to the right of the engine as it enters the bulkhead(a simple spring clips hold em both on) and flushed the system with a garden hose.Then made sure there were little or no air pockets in the top hoses as it ran all over the drive.Stuck a cork in the one hose  to form a vacuum seal whilst in quickly clipped the other onto the mount and then un corked the firts hose and reconnectted that.Topped up with antifreeze.All sorted

[The Smiths]

mY 2.5 td did the same.It was an airlock in the rubber pipe over the engine.I undid both hoses to the right of the engine as it enters the bulkhead(a simple spring clips hold em both on) and flushed the system with a garden hose.Then made sure there were little or no air pockets in the top hoses as it ran all over the drive.Stuck a cork in the one hose  to form a vacuum seal whilst in quickly clipped the other onto the mount and then un corked the firts hose and reconnectted that.Topped up with antifreeze.All sorted

Tried that this morning - it does not seem to have done much to the heat coming out