Engine over cooling after air con removal.

Post by **ADS1** » Fri Oct 10, 2014 3:51 pm

Does anyone else on here have a problem with over cooling, following air con removal? Or more accurately, air con rad removal. Since i removed mine a couple of years ago, i have noticed that when going down hill, even after 10 or more miles of driving, my temp guage will drop to the quarter mark on the guage, then return to normal when on flat road, or up hill!! Anyone else had this issue? I assume this is due to much better air flow to the radiator, now the air con rad is out of the way.

Post by **indigolemon** » Fri Oct 10, 2014 3:53 pm

Sounds like your thermostat is stuck open to me?

Post by **ADS1** » Fri Oct 10, 2014 3:57 pm

Maybe, but i replaced this at last coolant change. I will replace it at next coolant change, which is soon. But it seems to warm up normally.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Fri Oct 10, 2014 4:18 pm

Thermostat stuck, or coolant level low/air lock in the system (the thermosensor is high up on the system, so if this only happens when going down hill, it could be coolant level related)

Post by **Merlin** » Fri Oct 10, 2014 4:19 pm

Could it be that your coolant temp sensor is playing up?

In my 4G track car I have the OEM temp gauge plus an analogue 52mm gauge. On the main straights when I am over 100mph I can see on the analogue gauge that coolant temps dips while the OEM digital gauge stays in its normal position.

IMO in a properly working setup for the OEM gauge to display at only a quarter the coolant temp must be really low.

Post by **newkid** » Fri Oct 10, 2014 4:25 pm

Sounds like my old dc2, 2 new aftermarket thermostats and still had the same problem, eventually replaced with a genuine honda (was almost same price) and problem solved, was to do with the aftermarket ones opening at a lower temp.

Post by **ADS1** » Fri Oct 10, 2014 4:33 pm

Thanks for all the suggestions guys,I will give everything a good check over. But it could all be irrelevant, if my head gasket is gone, which i'm now quite concerned it could have,with the water i'm loosing. If so, that will be the end of the road for her i'm afraid.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Fri Oct 10, 2014 4:53 pm

ADS1 wrote: But it could all be irrelevant, if my head gasket is gone, which i'm now quite concerned it could have,with the water i'm loosing.

That could make sense

and would fit with my suggestion about why the gauge temp could drop on downhills...

Is this on the black one?

Post by **ADS1** » Fri Oct 10, 2014 5:10 pm

Yes, my black bb4. Head gasket was done in 2004, just before i bought her. But now i'm loosing coolant. Overflow bottle has dropped from max to min in about 160 miles this week, and has been doing so for about a month now.

Post by **Merlin** » Fri Oct 10, 2014 8:00 pm

That doesnt sound good