Engine heating up then dropping back down?!

Post by **4thgenphil** » Mon May 20, 2013 7:34 pm

my bb4 does the same thing, i have came to the conclusion its the thermostat as well

91pREluDe · Post by **91pREluDe** » Mon May 20, 2013 10:05 pm

On my 3rd gen I have a similar problem just its showing me overheating and then drops to normal

checked for water in radiator but its all fine and the car doesnt look like overheating

also is all 3rd gen fan turns on when you stop and turn the engine off? Its working for aprox 5-10min after a few mile ride. Thanks

kris_aka_edu · Post by **kris_aka_edu** » Mon May 20, 2013 10:13 pm

I don't have a fan on my radiator because the new radiator I fitted was slightly bigger than the standard for some reason? So tried to adapt the fans to work and then realised they didn't even work any way. So need to get new ones.

Any way on to the heating up, I can travel 40 miles without it even heating up half way. If I squeeze the pipes when it's hot it will go half way for a while and then drop back down again so no vtec as it thinks the engine is still cold?!

It's never over heated once... Touch wood.

The part it self is so easy to get to its right next to the manifold so 2 bolts and its undone. I'm hoping?!

I found a few on eBay really cheap between £15-£20. It's just finding the right one for the 2.2 92 as they seem to be non existent?!

kris_aka_edu · Post by **kris_aka_edu** » Tue May 21, 2013 7:53 am

I'm assuming that this is the thermostat? And some how the thermostat is inside the housing?

Got no idea how to take it apart without.

BMCC · Post by **BMCC** » Tue May 21, 2013 8:25 am

Yes the stat is in that housing. How hot are the upper and lower pipes? Is the top one hot and the bottom one cold? or are they much the same? I believe there is a 4th gen manual on the forum somewhere.

kris_aka_edu · Post by **kris_aka_edu** » Tue May 21, 2013 8:57 am

Both are hot to touch, can hear water running through both of them. I gave them a quick squeeze to help any thing through if it was blocked but felt quite good. It was hard so you could tell there was water in them.

BMCC · Post by **BMCC** » Tue May 21, 2013 9:26 am

Usually the upper hose it hotter than the lower as the upper comes from the engine while the lower is going back to the engine after being cooled by the radiator. Maybe the thermostat is sticking open then?

kris_aka_edu · Post by **kris_aka_edu** » Tue May 21, 2013 12:40 pm

Yeah that's what I think and from the previous posts will be my first option. Not expensive to fix at all so hopefully this will sort it when's get some time off at the weekend.

Post by **Vtecmec** » Tue May 21, 2013 12:55 pm

That's not the thermostat housing!

It is round the drivers side of the engine, near the back under the intake cam cap.

Post by **Vtecmec** » Tue May 21, 2013 12:58 pm

This: