Heater Hose Replacement Advice - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 09-04-2019, 06:15 AM Thread Starter
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Arrow Heater Hose Replacement Advice

Hello
I have a 7.3 SD that I bought new in 2002 and now have 210,000 miles on it, and I think it's time to change the heater hoses. I am smelling coolant and cant find where it's leaking from as there is no obvious drip anywhere. I have replaced all radiator hoses and the deguise tank and hoses and cap. But still losing a fair amount of coolant (about a gallon in 400 miles). Any tips on the coolant loss and heater hose (brand, place to get hoses, ect.) replacement would be much appreciated.
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post #2 of 8 Old 09-04-2019, 06:50 AM
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check the water pump and the outlet elbow on the bottom of the pump. There is either a straight or curved metal pipe bolted to the bottom of the pump (varies by year) with an o ring. Mine started leaking within a year or buying it. it was like $3 and good chance for me to drain the coolant/replace thermostat anyways.

Also are you seeing any whiter smoke than usual, sweet smelling exhaust vs the normal diesel stink?

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post #3 of 8 Old 09-04-2019, 06:55 AM Thread Starter
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check the water pump and the outlet elbow on the bottom of the pump. There is either a straight or curved metal pipe bolted to the bottom of the pump (varies by year) with an o ring. Mine started leaking within a year or buying it. it was like $3 and good chance for me to drain the coolant/replace thermostat anyways.

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Also are you seeing any whiter smoke than usual, sweet smelling exhaust vs the normal diesel stink?
No , no white smoke, diesel smell is normal.
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post #4 of 8 Old 09-04-2019, 07:05 AM
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Removing the heater hose quick-connect couplers at the firewall is a Grade-A pain in the butt. I bought the removal tools (Lisle brand about $35.00) and the tools at least made it possible (no way without them), but was still fussy.

When a loss of coolant is not obvious, I use a pressure tester and pump up the system. It usually shows up then. If you can smell coolant, there's a leak somewhere. Could be the heater core, but there's usually steam on the windshield, and the smell is obvious. And even though these trucks are approaching 20 years old, I don't see much discussion about failed heater cores.
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post #5 of 8 Old 09-04-2019, 09:23 AM
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I respectfully disagree with Dave about the tools necessary. I used a small flat-tip and it took about 2 or 3 minutes each hose.

I got replacement hoses and quick disconnects from rock-auto - work great. Took all of 20 minutes for everything.

If you get the quick disconnects first - it's really easy to see how they work and why a small flat tip does the trick.
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post #6 of 8 Old 09-04-2019, 07:37 PM
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Originally Posted by Arizona_SVO View Post
I respectfully disagree with Dave about the tools necessary. I used a small flat-tip and it took about 2 or 3 minutes each hose.

I got replacement hoses and quick disconnects from rock-auto - work great. Took all of 20 minutes for everything.

If you get the quick disconnects first - it's really easy to see how they work and why a small flat tip does the trick.
GOT ANY PHOTOS OF THE QUICK DISCONNECT PARTS?....

NEVER MIND.....I FOUND THE PART AND PHOTO ON ROCKAUTO.COM.....

LOOKS EASY TO ME.....PUSH FORWARD.....SQUEEZE.....PULL OFF.....

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post #7 of 8 Old 09-05-2019, 04:33 AM
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Yep, thatís it. Also note if youíre careful, you can slice them off as long as you donít damage the tube it connects too. Itís a bit tricky. I cut my hoses short, wrenched these off with flattip and beat the hell out of them and then yanked the remnants off with plies/dykes to get ready for the new ones.

Originally I carefully saved my old ones to try and reuse. They leaked. Spend the 10 bucks and replace them... so much easier.
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post #8 of 8 Old 09-05-2019, 02:31 PM
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I recently had very similar issues with smelling coolant in the cab. I rarely smelled it outside. Truck had a new water pump and cooling system flush done within 15,000-20,000 miles. Cooling system was pressure tested both static and while running and it held pressure. Also had no noticeable coolant loss. I finally popped the lid off the heater core and it was slightly sticky along the bottom of half of the core. Passenger carpet was dry.

I ordered new heater hoses and heater core. Not having put them on yet, I took the truck to the store and on the way back turned A/C on and had slight smell of coolant like I had for weeks. Got home walked to passenger side of the truck and coolant was running out from the backside of the passenger fender.

If you are losing that much coolant it would be quite wet around those connections. Its going to be harder to see a small leak from the heater core draining out the evaporator drain. Of course, this doesn't mean you aren't burning it due to head gasket either.

I bought my hoses and core from Rockauto. Riffraff also carries the hoses for a good price. Careful with the two plastic heater hose connections that mount to the valve cover studs. Ford thinks they are made of gold as retail is around $60. Riffraff has them for $28.
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