Help -- JDM H22 Thermostat size - Honda Prelude Forum

emunoodle · 09-19-2004, 10:05 PM

I did my swap a while back and I don't remember what thermostat I used for the engine (I think the themostat is starting to stick). The thermostat from the JDM engine was much bigger then the one I had. I think I tried a usdm h22 thermostat and it was too small. Can anyone tell me what is the size of the thermostat or what other car had the same size thermostat??

Thanks

Lucke · 09-19-2004, 11:13 PM

um, in order for the swap to work that whole peice with the thermostat in it has to be swapped with the USDM one because of a sensor that is missing in the JDM one.

as for the size i'm not sure. sorry.

emunoodle · 09-20-2004, 05:46 PM

I didn't swap the housing and it works I just can't remember what size themostat I got. I guess I'll have to pull it and take it to the parts store. Unless someone remembers.... Anyone???

xMrM02x · 09-20-2004, 06:41 PM

try 64mm...its different then the USDM one. I had a thread like this answered a while back... might want to try a search on it.

Spn BB2 · 09-20-2004, 09:08 PM

................ i have a jdm h22a, im using a normal usdm thermostat that i got from the dealer...........i hae not switched theromstat hosuign eithers....im not sure why you peopel having different sized ones

Lucke · 09-20-2004, 10:09 PM

Quote:

ECT sensor : The JDM engines lack and engine coolant temp. sensor that the US engines have (US have 2, JDM have 1). It is located on the upper radiator hose neck. I just swapped the neck from my F22 (with sensor) onto the JDM engine. The ECT plug on the US harness now has a matching sensor on the engine.

for you guys that didn't replace that part with the ECT sensor... how does your temp guage read accurately?

xMrM02x · 09-21-2004, 12:23 AM

Quote:

Originally Posted by Spn BB2

................ i have a jdm h22a, im using a normal usdm thermostat that i got from the dealer...........i hae not switched theromstat hosuign eithers....im not sure why you peopel having different sized ones

Hmmm, I guess that makes sense. I never looked at the one in my h23, when I went to different kragens/pep boyz they kept giving me one that was a lot smaller then what was in the H22A. That's when I decided to buy a 64mm and it fit fine, and that's what someone else used...again i posted a while back about it.

emunoodle · 09-21-2004, 06:29 PM

Thanks guys !!

I did try a search (JDM H22 Themostat) but the posts that came up didn't have any info. Thanks again

Spn BB2 · 09-21-2004, 09:45 PM

Quote:

Originally Posted by Lucke

for you guys that didn't replace that part with the ECT sensor... how does your temp guage read accurately?

please ignore my writing ans such on this picture i was using it for something else, but the h22a i got come with all 3 ect sensors listed in this diagram and another one not listed but referenced as the ect switch A wich is located on teh thermostat housing

edit: oops i forgot the pic

Spn BB2 · 09-21-2004, 09:49 PM

also the gauge reads off of the ect gauge sending unit which is the little black plug on the picture that you quoted(its right under the dist)

Lucke · 09-21-2004, 10:10 PM

ok, i'm a moron... i just remembered, the T-stat is in the lower radiator neck housing, not the upper with the sensor...

forget my other post.

xMrM02x · 09-23-2004, 12:48 PM

here ya go
H22A Thermostats