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rvmaybe · 11-30-2021, 04:31 PM

After 10 minutes of driving (at 65) I noticed the engine temperature climbing. Got off the highway and hid on a residential street when the temp got up to 227. Coolant all over the rear of the coach and the toad. Crawled underneath and found that the top hose on the coolant pump that lives over the drive shaft had come loose. I put it back on and tightened the clamps, filled up with water from the tank and drove 6 hours. Now waiting on a flush and refill.

This is the second time this hose has come loose. After the last loose (5 years ago), I had wider clamps put on as insurance.

I think the dash heat was on which means the pump was running. I wouldn't think the pump would generate enough pressure to blow the hose off but this seems like an unlikely coincidence.

Has anyone else had problems with these hoses?

phays · 11-30-2021, 04:40 PM

I've not had a hose failure, just a pump seal failure that caused loss of a large amount of coolant. On my 2000 Magna, those pumps were running anytime the ignition was turned on. I've since used a relay and added a switch to the dash that lets me turn those pumps off.

BonS · 11-30-2021, 05:30 PM

I like and use constant tension clamps instead of constant dimension clamps. And of course, be sure that the clamp is completely past the flare of the tube that the hose is slid over.

gsander1 · 11-30-2021, 07:23 PM

I plumbed around the pump thus eliminating it as a risk.

birdhunter · 11-30-2021, 10:37 PM

The dash heat "School bus" pump is unnecessary. Just delete and bypass it. I've never had a hose come off like that, but those pumps always eventually fail with the same result you experienced.

Smitty77 · 12-01-2021, 12:18 PM

Quote:

Originally Posted by gsander1

I plumbed around the pump thus eliminating it as a risk.

X's 2! On our Allure we did the By Pass on the way back from Alaska... Our Magna with ISX600, had the By Pass when we bought her last year...

Best of luck, and glad you caught it before it go way too hot!!!
Smitty

ArtJoyce · 12-01-2021, 02:23 PM

Quote:

Originally Posted by BonS

I like and use constant tension clamps instead of constant dimension clamps. And of course, be sure that the clamp is completely past the flare of the tube that the hose is slid over.

+ constant tension clamps for the larger hoses. Pricey but they work. I think I paid $9 each.