Cleaning engine cooling system

[tb13]

Hi guys I am new to cars and working on them, I own a 99 accord I recently picked up a 91 accord for $400 that is in need of some TLC. It came to my attention that the cooling system was filled with crap when I tried to fix the erratic idle issue.

To make this short and sweet, the engine block is filled with rust. I poured some distilled water and vinegar in it, but it didn't do much. I read that CLR/water should do the trick, but I was wondering if I shouldn't use my power washer to blast some of the crap out of the block's coolant passages before I dump some CLR and water in it.

Also, I already bought a new thermostat housing, the old one has the barbs half missing from rusting away, but should I buy new radiator hoses too, or will the ones that are on there be okay to reuse?

This is what the inside of the pipe going into the block looks like:

[oyajicool]

I would use a garden hose to flush the system rather than power wash. Power wash does not have volume of water as full blast of garden hose.
Also, I would replace hoses as much as funding allows me if it was my car.

[PR CB7]

most likealy WP impeler is really rusted
i would replace as much exposed/rusted metal as possible, new hoses and refill with coolant

search electrolisys

[tb13]

I would use a garden hose to flush the system rather than power wash. Power wash does not have volume of water as full blast of garden hose.
Also, I would replace hoses as much as funding allows me if it was my car.

I ended up doing this, it pushed out nasty brown water for a few minutes before clear water began to come out. I am going to do a CLR flush then put it all back together.

most likealy WP impeler is really rusted
i would replace as much exposed/rusted metal as possible, new hoses and refill with coolant

search electrolisys

Hmm, I didn't even think about the water pump. I will have to check that out. I am going to grab some new hoses when I go to get a belt to bypass the AC since I removed it.

[Accord problems]

I ended up doing this, it pushed out nasty brown water for a few minutes before clear water began to come out. I am going to do a CLR flush then put it all back together.



Hmm, I didn't even think about the water pump. I will have to check that out. I am going to grab some new hoses when I go to get a belt to bypass the AC since I removed it.

also replace the timing belt would be a great idea since you have to remove it any way's .