I have a 1990 accord that Im bout to swap radiators in old one has a crack. So im replacing with a new one. Anyone know how to install new one without any issues?

 

Unbolt it and bolt the new one in? Its not like you're porting the head lol.

Its fairly straight forward, just make sure everything is disconnected before you yank it.

 

Pretty much it. I will add a few points.

Suggest new rad hoses and a t-stat. If it is an auto trans, buy about three~four foot of trans cooler hose - NOT FUEL LINE, HOSE MUST BE RATED FOR TRANS COOLER USE! - and replace those hoses as well.....also if an auto you'll need a quart or so of Honda trans fluid.

Once you get the top "support" removed, hoses off, electrical connectors to the fans off...pretty much lift straight up. Might have to "wiggle" it past the ac lines.

Biggest thing, once you have the new one in and connected back up.....proper bleeding of the cooling system.

Set the heat to max so the heater control valve is open. Open the bleeder valve on the t-stat housing. SLOWLY add 50/50 mixed coolant to the rad until a steady stream of coolant is coming out of the bleeder valve. Close the bleeder valve.

Replace the cap to ONE CLICK ONLY (almost a quote from Hunt for red october ). THIS IS IMPORTANT as you do not want the system to build pressure for the next steps.....one click only.

Make sure the ac is off and turn the blower motor off. Start the car and let it run. Keep an eye on the temp gauge. Check for any leaks. Let the car run for 15~20~30 minutes, while keeping an eye on the temp gauge, until the fans (BOTH) cycle at least once.

Once they do cycle, shut the car off. Remove the cap - NOTE WARNING OF ONE CLICK so there is no pressure in the rad. Top off if needed, top off overflow if needed. Done

Again - your risk, coolant will burn and the reason for the one click is so that pressure will not build in the system.....never open a hot cooling system that is under pressure.