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icon5.gif  Do I need a new radiator ??? [message #183872] Mon, 10 September 2012 16:06 Go to previous message
Scooby Doo is currently offline  Scooby Doo   United States
Messages: 92
Registered: May 2012
Location: Miami, Florida
Karma:
Member
GMC.netters,

I am starting to feel a little guilty.
I sure am using you guys a little too much lately.
Hopefully, I will get everything in tip top shape by the end of the year and go back to just lurking.
Then maybe one day, I might be qualified to help someone else out.
Thank you for being there for me.

Last week someone posted that his water temp was running too low.(lucky guy)
Got me nervous that mine is running on the high side.

On the last few road trips I have noticed that the water temp seemed a little on the high side to me. (Especially after I put in new gauges & have real numbers to go by).
Now here are some facts.
When I purchased the coach, I installed a new (high volume) water pump, A 10Lb. radiator cap, & a 180 degree high volume thermostat, spring in lower radiator hose, 50/50 coolant.
Recently a new mechanical Stewart Warner water temp gauge(very accurate), and a IR handheld thermometer for a back up.
When I had the water neck off I was impressed of how clean & NON corroded the engine water jacket area looked.

On the open road in Florida, I am running around 200 degrees to 210 degrees and when in city traffic around 220 degrees.
I was concerned that my thermostat could be defective so I removed it today to put that out of the equation.
(Results are roughly the same with it in or out).
I did not have the time to take it for a drive today, so I let it idle up to around 180 degrees and then brought the engine to 2000 rpm to get some water & air circulation. My temp just kept rising slowly to 223 degrees(the whole process was about 25 minutes)
And finally my clutch fan kicked in (@ 223d.)

I am thinking that I have looked at, and changed everything except the radiator.
Before I go out and make that huge $ purchase I was wondering if I should do anything else I may have not thought about to try and confirm it is the radiator. It seems as though putting a new radiator in will be a BIG job. (But, I am up to it)

I will be calling Jeff at Alex Sirums tomorrow to see if he has a radiator in stock, and also if I have any choices.
I noticed other posts about people using aluminum radiators as if everyone is using the same brand/style radiator?

So far I have been working on the GMC almost as much as driving it.
But, that's OK, we love our "Scooby Doo"

As always, any advise will be greatly appreciated.

G2... Smile


Glenn & Elaine Gardner... Miami, Florida... 1976 Royale (transmode) TZE366V100733

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