My son's P5 has a small coolant leak that appears to be coming from the heater hose connection at the firewall. You can see the corrosion and remnants of coolant on the clamp. It's not gushing out, but after about 100 miles, the overflow tank is nearly empty after it's been filled to the FULL mark.




My question is about how to best access the connectors to get them both off (I plan to replace both hoses and fittings while I'm in there). Looks like the connectors are part number BJ1H-61-240(a) for the 90 and B455-61-240A for the straight.

It's a tight fit getting to them over the top. I think if I remove the CC servo and a few lines I might be able to reach it. I'm a bit leery about disturbing too many vacuum hoses around there. I haven't jacked the car up yet to see if it's easier from below. The YT vids I saw were not specific to the P5 and the vids appeared to show the heater core ports in a more accessible position.

Has anyone done this? What way is best direction to get those fittings off? Are the parts numbers above the correct one?

 

I was able to verify through my local Mazda dealer those are the correct parts and I have them on order. Oddly enough, they are cheaper than other online sources and the dealer is practically around the corner from me (no shipping) and they'll get here sooner.

 

I managed to get a hose clamp around the fitting and it seems to be OK now.

I pulled the Cruise control servo out of the way along with the small canister and it gave me enough room to access the fitting. Using some channel locks I was able to slide the spring clamp down the hose far enough to clear the fitting. Slipped a worm clamp around it and was able to get it nice and tight. Ran the engine until full temp, let it idle a bit longer, check the clamp, no signs of coolant. Shut it down and let it sit for about 30 minutes to see if any still seeps out and it still looked dry. Since my son needs to use it, I didn't want to risk making this a bigger job by pulling the hose out completely. I'll save that for another day since i have to take the intake tube and some other stuff out to get the other end of the hose.