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Old 01-22-2013, 05:38 PM   #1
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Cat C7 Radiator Temperature Fluxuations

I have a 2005 Safari Cheetah with a Stacked Rear Radiator. 160k miles. Long time out of warranty, I've serviced it regularly due to running it for business.

I've just finished having CAT replaced ALL the hard lines, hoses AND the Radiator, temperature guages, thermostat, radiator cap, clamps, over the past year. And just got it back from putting in the new radiator.

And the temperature guage still acts like a pogo stick. It will run up to 210-230 the check engine/warning comes on, then drops ALL the way back to 0, then will run back up to the normal range of around 190, then will creap up to peak again and drop.

I loose all front dash heat when the temp peaks. Then it comes back after the drop.

I am not pulling or hauling anything different than I have the past 7 years. Anyone got any ideas where else to look?

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Old 01-22-2013, 11:09 PM   #2
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you have air trapped in your coolant system get it bled out before you break a head or float a liner. let the shop that did the work know right away so there is a record.

99 Hurricane 30Q
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Old 01-23-2013, 03:21 PM   #3
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There is procedure for this, add coolant, open a bleeder someplace until water comes out, add coolant, run, open bleeder...repeat.

The service shop should know this!

Call them ASAP as it is on them to get it correct on them.

Tell them you would prefer their mobile Tech come by as you do not want to drive and risk damage.

They should not charge for this, offer to look for them, they can tell you what to do and you could do things like check the bleader if you can get to it as well as checking the coolant

Good luck and let us know how it goes
Tony & Lori
1989 Country Coach Savannah SE
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Old 01-23-2013, 03:36 PM   #4
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Originally Posted by TQ60 View Post

There is procedure for this, add coolant, open a bleeder someplace until water comes out, add coolant, run, open bleeder...repeat.
This is the actual fill procedure tag on my radiator. Sounds like the procedure you have described

2001.5 Fleetwood Discovery 37U 330HP Cat
Toad-2008 Yamaha Royal Star Tour Delux
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Old 01-24-2013, 09:27 AM   #5
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I called the Cat shop, and they didn't know of any bleeder valve on this model. It seems school busses have the same problem due to the long length.

This is a stacked radiator in the rear of the coach. 38ft Safari Cheetah.

They had me raise the rear end, I put blocks under the rear jacks and was able to raise the rear wheels about a foot off the ground and then run at a high idle for at least an hour, to try and "burp" the air out, then I took it for a test drive. I did this twice.

After the second session, it seems to have gotten rid of some of the air, I'm not getting the 210-220 high peaking anymore before it drops. Only about 200, which is only 10 degrees over normal running for this coach, then it adjusts. I also live at 6,000 ft. which may make this a little harder.

Since the guage does not stay at the peak for more than a few seconds, 5 at the most before dropping, they're not too worried.

I'm headed to sea level in a few days and hopefully that will finally "burp" the rest of the air out.

Thanks for your help, any other suggestions would be great.
Amy & Andy ~ Tetonia, ID
2005 Safari Cheetah 38PDD
160k and still crusing around the country!
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cat, radiator

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