Guest Sidney22 Posted July 3, 2013 Share Posted July 3, 2013 I pulled my 90 Reatta from the garage this morning and drove it to work. Coming back to the office from running errands, the temperature indicator showed that it was getting hot. The a/c stopped cooling, but kept blowing. When it reached the point of TELLING me it was HOT I pulled over. However, the radiator has coolant and the engine has oil and transmission fluid. No indication that the ENGINE was actually getting hot, but the indicator kept telling us it was. Both cooling fans are running fine. Best we can figure, it might be the engine temperature switch. No belts or hoses are broken or leaking. So..... where IS the temp switch and can we replace it ourselves, without having to get it to a mechanic? Or, is there any other possibilities that somebody else can suggest? Link to comment Share on other sites More sharing options...
padgett Posted July 3, 2013 Share Posted July 3, 2013 It is below the throttle body. What is ED04 reading ? See page 8A-201-1 Fig A in the 90 FSM. Link to comment Share on other sites More sharing options...
Guest Sidney22 Posted July 3, 2013 Share Posted July 3, 2013 (edited) Padgett, the a/c will blow cold just fine as long as the car is just started up and cool. Once the car starts showing "hot", the a/c stops blowing cold air. We'll go into the diagnostics mode in the morning and check! Edited July 3, 2013 by Sidney22 (see edit history) Link to comment Share on other sites More sharing options...
padgett Posted July 3, 2013 Share Posted July 3, 2013 When the computer receives an overtemp reading it will turn the a/c off. Whether the reading is correct is the question. Link to comment Share on other sites More sharing options...
Guest Mc_Reatta Posted July 3, 2013 Share Posted July 3, 2013 Use diagnostics to see if the coolant temp sensor is functioning normally.A/C Temp Sensor Troubleshooting - Reatta Owners JournalSensor is a little hard to see and get to where it sits tucked under the throttle body, but isn't difficult to change out. Link to comment Share on other sites More sharing options...
Ronnie Posted July 3, 2013 Share Posted July 3, 2013 You can also use one of the cheap inferred thermometers to check the actual temperature of the radiator without opening it. Harbor Freight has them as well as the tool section of the Reatta Store. All you have to do is point it and pull the trigger for an instant readout of what the laser pointer it touching. Very handy for checking for plugged catalytic converters as well. Below is a photo of the one I own. I use it on an engine when it's running good to know what to expect when something goes wrong. Link to comment Share on other sites More sharing options...
Guest Sidney22 Posted July 14, 2013 Share Posted July 14, 2013 (edited) Ran the diagnostics this morning. Let me start (do NOT laugh) by saying, there is NO way I am a mechanic, and truly understand VERY little about how cars run but I probably understand more than most girls! Ran them all on a cold engine with the engine off. Seems like some need to be run with the car running? This run through, the ED04 was 036. Let me know which (if any) of these need to be run with the engine running please.Oh, and Ronnie, I HAVE one of those infrared thermometers!!! Will check that, thanks! Edited July 14, 2013 by Sidney22 (see edit history) Link to comment Share on other sites More sharing options...
padgett Posted July 14, 2013 Share Posted July 14, 2013 If ed04 was 36 with a cold engine either the sensor is bad or you live in a very hot climate - 36C is 96.8F. With a cold engine BD26 and 27 should read the same as ED04. Link to comment Share on other sites More sharing options...
Guest Sidney22 Posted July 14, 2013 Share Posted July 14, 2013 Oh... actually, I am in Texas and it was probably over 100 degrees that day. However, car had been in the garage and all I did was to back it out where both doors could be opened. Was that enough to raise that temp?BD26 was 34 and BD27 was 33. Link to comment Share on other sites More sharing options...
padgett Posted July 14, 2013 Share Posted July 14, 2013 Sounds about right. So when it is acting hot what is ED04 then ? Is the upper radiator hose hot ? Might be a stuck thermostat. Link to comment Share on other sites More sharing options...
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