Jump to content
wfstewa

Coolant warning light

Recommended Posts

I have a 2008 Tiffin Phaeton with the Cummins ISC 360 HP engine. As I was approaching my present destination, a "check engine, coolant warning" amber light came on. It went on and off as I traveled the last 10 miles or so to my destination. On checking the coolant levels after the engine had cooled, I found that the "surge" tank was filled to the proper level between min and max.  Also, while the warning light was coming on the temperature gauge and the oil pressure gauge remained at normal levels. A couple of years ago, I had the cooling system flushed and refreshed at a freightliner service facility. Any ideas about why I am getting these warning lights will be appreciated.

Share this post


Link to post
Share on other sites
Quote

Coolant warning light.

You have a bad sensor, it should be located on the surge tank about half way up.  Disconnect the 2 wires and order a new one from Tiffin.  Call Tiffin Tech and it will be sent to you, $40+/-.  Mine was $38+ with shipping.

When you replace it, use a clean gallon bowel, unscrew old, insert new and reconnect wires, pour coolant back in tank. :D

Share this post


Link to post
Share on other sites

My experience with overheating.

We have a Fleetwood Expedition on a Freightliner chassis with a Cummins 6.7 liter engine that we purchased new.  Between 10K and 40K miles we chased an overheating problem that presented as coolant temperature and engine temperature trouble signals.  In every instance we returned to the nearest Freightliner dealer in various parts of the U.S.  During this time, sensors were replaced, fan clutch replaced, water pump replaced, thermostat replaced and the radiator steam cleaned without removal.  Ultimately, a Cummins dealer in Phoenix diagnosed the problem as dirt and debris, between the radiator and charge air cooler.  This was without hesitation and without inspection.  While we relaxed in the motor home they removed the radiator and charge air cooler, then invited me to take photos of the two with caked dirt and grass that covered both surfaces.  We like remote camp sites.  After they were cleaned, the digital engine temperature display has never exceeded 202˚F regardless of the load, altitude or speed.  Normal at cruise is 196.  After every trip I make a point of hosing down the radiator and charge air cooler.

Share this post


Link to post
Share on other sites
1 hour ago, bhalldorson said:

My experience with overheating.

We have a Fleetwood Expedition on a Freightliner chassis with a Cummins 6.7 liter engine that we purchased new.  Between 10K and 40K miles we chased an overheating problem that presented as coolant temperature and engine temperature trouble signals.  In every instance we returned to the nearest Freightliner dealer in various parts of the U.S.  During this time, sensors were replaced, fan clutch replaced, water pump replaced, thermostat replaced and the radiator steam cleaned without removal.  Ultimately, a Cummins dealer in Phoenix diagnosed the problem as dirt and debris, between the radiator and charge air cooler.  This was without hesitation and without inspection.  While we relaxed in the motor home they removed the radiator and charge air cooler, then invited me to take photos of the two with caked dirt and grass that covered both surfaces.  We like remote camp sites.  After they were cleaned, the digital engine temperature display has never exceeded 202˚F regardless of the load, altitude or speed.  Normal at cruise is 196.  After every trip I make a point of hosing down the radiator and charge air cooler.

Yes it is a common problem with rear radiator coaches. It should be addressed at least yearly.

wfstewa, I would look at yours to.

Bill

Share this post


Link to post
Share on other sites

WBill.  I do agree, that is a thing I do every time, I come home after my 7-10K summer trip!  OP had no increase in Temp or loss of fluid. = Coolant sensor!

Don't know where bhalldorson lives....but you and I live in the land of 2 seasons and June to October, it's well over a hundred in the shade with a fan on!   

Share this post


Link to post
Share on other sites
1 hour ago, manholt said:

WBill.  I do agree, that is a thing I do every time, I come home after my 7-10K summer trip!  OP had no increase in Temp or loss of fluid. = Coolant sensor!

Don't know where bhalldorson lives....but you and I live in the land of 2 seasons and June to October, it's well over a hundred in the shade with a fan on!   

It never hurts to add cleaning the CAC to your annual maintenance list. I hope to escape before it gets to hot.

Bill

Share this post


Link to post
Share on other sites

Yea, me too.  Going to Ruidoso, NM the 11th of June, but could be May 20 if the weather dictates it.  Sincerely hope you and DW get to enjoy a full Summer in Main, this year!  :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...