90 Si Hatch

YES i have searched and read everything you can possible read. but for some reason my heat will not get Hot. the temperature gauge will read normal and i can even feel the lines on the back of the heater core from inside the car and they are hot.

but i can turn on the blower to high (4) and it will blow almost hot air for about 30 seconds, then go Luke warm. then i turn it off for 30 seconds and back on and just repeat the same thing over and over....

i have read other threads, on which way all the valves should be. but could someone please help me go over this again!

jlk16188

i have heard this could be a result of a failing head gasket or you need to flush and refill your coolant

90 Si Hatch

but the whole time, like i said in my first post. i can feel the lines coming into the heatercore inside the car and they STAY HOT

Deetz

how old is your thermostat? and, is it oem?

FEAR6655

Possibly a blocked heater core causing poor flow of hot coolant; not enough hot water flowing through to replace the heat being removed by the fan.

90 Si Hatch

2 1/2 years old i think it came from Auto Zone, cause Honda was out of them the day i needed it.

does anyone have a diagram of the coolant hoses going into the heater core from the engine?

Tyson

can you show me all the links in the FAQ that have to do with "no heat"?

Jockone

Only 2 hoses go from the back of the engine through the firewall,one goes through a valve first.They are located in the middle of the car by the throttlebody.

Put a cooling system flush through the car first and see if that helps and when you are flushing everything out take both of the heater hoses offand use a garden hose and put it in both of the heater core pipes to flush it out well.

90 Si Hatch

i know there is only two hoses for it, but just want to make sure they are going to the right places on the back of the block.
_______

before i put the new heater core in i used my pressure washer to clean it, and the water flow is GREAT!

Jockone

One from valva goes to the water outlet spout on the head under the dizzy area and the other one goes to the spout on the thermostat housing.

90 Si Hatch

just took this!

Jockone

They are going to the right places.

90 Si Hatch

also i found this and didn't know if this could cause any flow problems?

Jockone

That could be restricting the flow of your coolant and causing your problem.

FEAR6655

Looks like a good place to start. Try straigtening that kink out.

08ReDevil

i just fixed mine and i knew what it was from minute one. car idling it gets hot...under load thermostat wont stay put and it flushes all coolant back through system. its the thermostat. Fix the hose and new thermo. I promise....if it doesnt ill pay for your parts

90 Si Hatch

Haha okay my friend, will do! and i will hold you to it!


the motor is a jdm d15b vtec, which usdm motor should i order a new thermostat for, i cant remember what i used last time????

hatchet_honda

its the damn kinked hose...shoulda got another hooped oem hose to put back on there instead of that non flexible random piece