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post #1 of 3 (permalink) Old 15th September 2006 Thread Starter
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Thermostat replacement

Have just bought a 1997 1.8 8V Laguna 142k miles on the clock and still going strong.

She runs pretty well, but looks like the thermostat is stuck open (temp guage near zero + lukewarm heater).

As it is an old car, I was planning a quick and dirty thermostat replacement - the idea being to aviod draining the complete system. The plan is as follows:

1. Remove the upper hose from the radiator - this hopefully drain the coolant only to the top of the rad

2. Remove the rusty torx scres that hold the thermostat in place (this should be fun....)

3. Replace the thermostat and re-assemble

4. Top up header tank and assume that any air in the system finds its way into the header tank via the ressevior return pipe.

I know that I should bleed the system, but it looks like the bleed valve next to bulkhead has broken off.

Question is: will this work, and if not, will I get an air lock and kill the car?

Thanks for your help.
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post #2 of 3 (permalink) Old 15th September 2006
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Hello and welcome to the forum.

Your plan should work,and if the bleed nipples are seized/snapped,then you have no other option.

Once you changed the 'stat and topped up the coolant,make sure the heater is on hot and keep the car revving at fast idle speed(2,500 to 3,000 rpm).The coolant should eventually start circulating.Obviously,if the temperature gauge goes above 3/4,then switch it off,leave it cool,top up the coolant again and repeat the excercise.

You can also try and remove the header tank from it's mountings and lift it up higher,this will encourage the air to bleed out of it.

Good luck,and let us know how it goes.

I'd rather push my Alfa than drive a BMW....
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post #3 of 3 (permalink) Old 15th September 2006 Thread Starter
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Thanks lagdti.

Good advice about the header tank.

Let you know how I get on...
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replacement , thermostat

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