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Discussion Starter · #1 · (Edited)
Hello,

I've got a 97 Honda Prelude, with a H22A4 motor (AUDM)

Since purchasing the car the temperature gauge will often go right up to the 'h' only after a drive. If the car is started cold and left to idle for 30 mins plus, it doesn't happen. I'm assuming the car isn't actually overheating, as the temps under the bonnet are between 70 degrees (158F) and 90 degrees (194). When idling the both fans do operate as usual.

So far I've changed/tested the following
  • Replaced ECT
  • Replaced Fan Switch (also confirmed wiring okay by shorting fans)
  • Replaced Temperature Sender (shorted wiring and ensured gauge in cluster rises)
  • Replaced Thermostat (including new seal)
  • Flushed rad, bled coolant - confirmed no coolant loss
  • Cleaned all grounds, changed location of ground on thermostat housing
  • Check CEL codes - code 3 for MAP sensor (cleaned and code is gone)
  • Changed oil and filter (for good measure) - confirmed no coolant in oil.
  • Confirmed heater core is ok - Heat coming through to cabin ok

I'm really at a loss here. Everything is working as it should, yet the gauge will slowly rise to 'h' as the car is driven.

Any advice would be greatly appreciated

28638

28639

28640
 

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i would say i have the same issue, driving ,in stop and go, the gauge will go to max but then come down if you drive on highway. if it just idles in driveway after driving, it doesnt goto max and the rh side fan does come on (pass side fan) at about 1/2 temp gauge , but it can be at max gauge temp and the fan doesnt come on.this is worrying my son who drives it so hes riding around in the summer with the heat blasting!....im THINKING everything is actually "OK" and the gauge and fan use different sensors, and the GUAGE is overestimating and VERY sensitive .Gauge does come down to 1/2 way in normal freeway driving , AND also just idling. yes i could do an exhaustive search of the manual..but im old and tired (kinda like the car)!
 

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OK,i am confused,there are 3 sensors, the fan switch screwed into the thermostat housing and a ETC (for engine ecu) and temp GAUGE sender. the helms shows both those up by the distributor page 10-14 AND down by the thermostat housing page 10-9? where are they really ? ????????
 

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my 1997 prelude suggests up by distrubutor...the story to date:plugged in obd scanner.... a bit over 1/2 on temp gauge obd said 220....seems hot no but fans on ....YET let at idel i swear fans work....top rad hose cant touch. bottom rad hose can grab...does not seem that hot?... WHICH WAY DOES COOLANT FLOW?... OUT of bottom or OUT of top .ug wiings i am dying here...i THINK the theromo stuck closed ...cold bottom hose, doesnt trip fans on hose side,,,but eventually does ...220 up by distrib....HOT tophose....OK when driving, stop and go not so much temp gauge pegs..>AND I THINK temp gauge true (was suspect based on post)...weird because this is a NEW problem it seems...yet car runs,drives fine to walmart and kids thing i am an idiot for threanening to take their car apart!!

Replaced Thermostat (including new seal) ----<-------AAAnd thats my plan---crying face
 

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ok update...if you hear hooves thing horses not zebras...i SWEAR i checked the fans visually coming on but main fan doesnt come on with ac on.but 14v present at plug, presented 12v from battery to fan but no operation of fan. new fan ordered...checked lower rad hose on startup...cold...did warm up..no fan. jumped thermo switch...no fan..ITS THE FAN...at least. i think i might wire up a switch now to make some decisions the ecu cant see coming!!
 
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