Coolant low pressure switch

Jay Lutz

Jay Lutz

Well-known member
Looking for a local source for one of these or similar.

https://www.pegasusautoracing.com/produ ... RecID=9749

Maybe there is a street car that uses one so I can direct my local NAPA or other parts guy. Looking for a PN and source. Turns out Miatas aren't plumbed to give a good heads up if you have a coolant system leak. By the time the temp gauge rises as my photographer friend Mark Weber says.........."It's all over but the cryin"

Great idea for ALL racers

Thanks, Jay
 
Jay
I learned about these when I worked at the race prep shop. It is a great thing to have as it can prevent the loss of a motor due to low or leaking coolant.
I use one on my Baby Grand.

cheers
dave parker
 
I've used a low coolant pressure switch and light for years (after loosing a hose & not knowing it blew off - toasted the engine in 2 heartbeats). If you are using a low pressure cap (rotaries, in particular), low pressure switch is good. It's really good to know the system pressurizes: light goes out as engine warms up!
 
Larry
The pressure number for the switch seems to vary from kit manufacturer to kit manufacturer. I have seen them as low as three pounds and as high as five pounds.
The one in my Baby Grand is a four pound switch.

YMMV.

cheers
dave parker
 
James, pretty much anywhere on the pressurized side of the cooling system should work. i.e. NOT the reservoir!

any reason why an oil pressure switch wouldn't do the job, or do you guys think they would corrode and fail internally?
appearance is identical to the oil pressure switch on my nissan, chevy, Mitsubishi, umm just about every car I've messed with one..
 
5 lbs vs. 20 lbs. water & oil

Putting it in a hose line doesn't work very well. You need to use a block tap. At least that's my experience with them. On the Miatas and FF I used the stock port in the head. You can always tee off it and use both the temp and the pressure units.

James
 
The VW "black" OP switch is about 3-5# and should work. I will install one on the Turbo Jett Chumper in the next few days , and get back.
 
Mike, that would be perfect...the exact pressure setting is somewhat irrelevant so long as it's in that area.

Also looking for a PN and source if that isn't asking too much.

It's all good!

Jay
 
My car has a turbo boost pressure gauge on the dash plumbed into the cooling system. This no doubt left over from way way back in the days of crappy gas and head gasket problems. I can read the actual cooling system pressure real time. Reveals both high and low pressure issues.
 
Mike, I just called Stu, referenced you.........and he has no idea what you're talking about. He understands the needed part, just has no sources. Help!
 
Italked to him today also. The part fits VW, low pressure oil switch. "black". ( there are more than 2) marked .6-.8 bar or something along those lines.
I need some other stuff. and will call him again.
MM
 
Kendal,

$18 is great.......if I can buy it at the local VW dealer. Not keen on shipping it for 1 thing.

Also, I have to save up for my next helicopter flying lesson. The first one was unbelievable!!
 
Well actually I am pretty cheap sometimes but not for other things. $250k out of pocket (no loans) for the daughter's Notre Dame and Harvard Law education took some of the wind out of my sails. I'm guessing many of you might understand facing big education bills as well for many more kids than one.
 
He has one and will have 4 next week. 5-6$ each
You need to say VW OIL pressure sender , B;lack. (Not coolant pressure sender.)
MM
 
Protech Racing":kdu1bu7s said:
Italked to him today also. The part fits VW, low pressure oil switch. "black". ( there are more than 2) marked .6-.8 bar or something along those lines.
I need some other stuff. and will call him again.
MM
Click to expand...

Those will probably be too high of a pressure for coolant. Most radiator caps are in the 15-20 psi range. So between your light going on for low pressure and your cap opening for high pressure you have less than a 5psi range?? Going to get a lot of false alarms. Theres a reason they are intended for oil and not coolant, different pressure levels.
 
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