Re: Thermostat Question

["tom felts" <tomfelts@earthlink.net>]

OK---stupid question-------howdo you know if yours is a "bellows" type?




> [Original Message]
> From: David Nock <healeydoc@sbcglobal.net>
> To: Bob Spidell <bspidell@comcast.net>; Healey List List
<healeys@autox.team.net>; Dave & M <rusd@velocitus.net>; Blue OneHundred
<healey.nut@gmail.com>
> Date: 10/18/05 2:08:07 PM
> Subject: Re: Thermostat Question
>
> The sleeved thermostats that we were supplying were not available for a 
> while. We now have them in stock again.
>
> There is a big problem that we have found with the bellows style 
> thermostat. If you have upgraded the cooling system and are using a 
> higher pressure radiator cap than original. The problem is that the 
> higher pressure will cause the thermostat to close. Then the engine 
> temperature goes up and you have a overheating problem. So be careful 
> it you are using a bellows type thermostat with a radiator cap that has 
> more than 7 lbs pressure you will have a overheating problem. The other 
> problem with the bellows style thermostat is that when it fails and all 
> thermostats will eventually, the bellows style will fail CLOSED. The 
> wax capsul style thermostats are designed to fail in the open position.
>
> They both will do the same job when installed, they will close off the 
> bypass allowing all the coolant to flow thru the radiator. The bypass 
> is the to allow the coolant to flow around the block when the 
> thermostat is closed. All engines have one somewhere. The 4 cylinder 
> Healey motors the bypass is built into the block thru the water pump.
>
>
> David Nock
> British Car Specialists
> Stockton Ca 95205
> 209-948-8767
>
> www.britishcarspecialists.com
>
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