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Update on my cooling problem.

I had described a cooling problem that I thought was solved by purging the air from the system.

However, after a sustained day of crawling over the Lockwood and up the Miller Trail, then a high speed run back to the SF Valley, I had a vaporlock, no indication of high temp, and the radiator was *cool to the touch*. That is, until I belched the pressure release, then all the superheated water flowed into it.

I'm glad it stalled a half hour from home, and not halfway up the steep Miller Trail.

Mechanics take on it: screwed thermostat. Also recommended rodding and boiling the rad, but that was only 100$ cheaper than a new, warrantied rad. So I got a new rad along with the 'stat.

What I have to watch for is the condition that caused the first rad to go bad.

Cal

'94 YJ

37s on Dyna60 Rear+Dyna44 Front
Reply to
Cal Wheeler
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Cal Wheeler did pass the time by typing:

What amazes me is the sillyness of putting temp sensors where they do no good. Take the ZJ. It's located above the temp regulator. That's good, but in the Grand Marquis it's located at the top of the radiator. That is stupid. If the engine vaporlocks or the radiator runs low the temp sensor is out of the coolant. Wonder why they don't put those down on the radiator or closer to the water jacket.

I'm almost tempted to track down a sensor that could be threaded into the engine block or into the oil pan. Actually, oil temp might be a good way to go. hmm. Should be able to use the same sensor too.

Reply to
DougW

I think you've got something going there. A autotranny temp sensor could be fitted where it's needed. I don't know where the YJ heat sensor goes, could anyone clue me in? I can understand the thermostat going on the fritz, but why didn't my temp sensor give me a heads up?

Reply to
Cal Wheeler

Actually on the ZJ it's above the regulator. And I did have a problem after loosing some coolant and the temp not showing what was going on.

It has to be either on the radiator or by the regulator. That's the usual place. It didn't work because it was hanging in an air pocket and couldn't read the actual engine temperature.

As for the autotranny. If you don't have a tranny cooler the bolts where the hoses go might be a good place. It would take some doing to find a location where a sensor could be threaded into the case. I'm thinking about using a tranny cooler then building an aluminum block in the line.

You have the feed coming from the tranny going into the block where it can flow next to/around the temp sensor. That block can then be mounted anywhere like up against a frame rail. Install a valve and you could take the tranny cooler out of the loop for winter driving.

Reply to
DougW

Reply to
L.W.(ßill)

On 27 Nov 2003 09:15 PM, DougW posted the following:

Install a coolant pressure gauge. If you are losing coolant, the pressure drop will give you the earliest possible warning.

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Del Rawlins

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