Fuelpump will not always turn on when temperature is above 60 .car runs great when its under 60, it never fails. i repaced fuelpump and fuel pressure regulator. when car fails to start i'v made atemps of, starting fluid, detatching hoses in fuel vapor return line removing gas cap , made sure fuel cutoff switch didnt trip and removing negative battery cable. none of these attepts work anymore .could it be a senser or a relay?
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-No not to worry about it if your car never over head.
-No you can't get any reading if the temperature is at your thermostat's setting or below.
-It connect or (Works) ONLY when the temperature at that area reach above the thermostat setting or up to 200 degree or higher.
Are you talking about the fans under the hood? If so, these are thermostatically controlled. They won't turn on unless the engine (and thus the coolant in the radiator) gets above a certain temperature. But they will always run when the A/C is on. If yours NEVER run, even when you've been sitting in traffic with the engine running for an hour on a hot day, take the car to a shop and have the fans/thermostats checked.
First time you might check the thermostat operating.
Heed of antifreeze coolant temperature!!! The thermostat location for a 2000 Audi A4 1.9 TDI is on back of the alternator at the bottom side of the bracket.
IMPORTANT NOTE: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking: 1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!! 2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg. 3. The thermostat opening temperature is 87 C deg. 4. If the hose is already warm the thermostat is out of order.
Thermostat location, Part number: 044121113, in german - "Kuehlregle" (Price around $25):
Important note: Always replace the thermostat round seal, position 7 in the above picture.
I would suspect either the temp guage or the coolant temperature sensor being inaccurate. The new thermostat is probably working good, or else you wouldn't have a very warm heater. If you have electric radiator fans, you might check to see if they are running all th time. Electric cooling fans should only come on when the temperature sensor reaches a predetermined coolant temp, or when the a/c or defroster is turned on. If the fan runs all the time, the engine would not reach normal operating temperature.
Heed of antifreeze coolant temperature!!! First time you might check the thermostat operating. The thermostat location for VW Golf 1.6 is inside of coolant thermostat housing placed on back side of the cylinder head. See pictures below. Thermostat checking: 1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!! 2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg. 3. The thermostat opening temperature is 87 C deg. 4. If the hose is already warm the thermostat is out of order.
Thermostat location, Part number: 032121110B, in german - "Kuehlregle" (Price around $20):
Important note: Always replace the thermostat round seal, position 6 in the above picture.
Listen for the fuelpump when you first turn the key. It will run only 1 or 2 seconds and then cut off. If you do not hear it run, there is a switch in the trunk next to the Airride.
This is the Inertia switch and you need to push the button on it and hold it in for 1 or 2 seconds. Then turn your Ignition key and see if the fuelpump runs. It should start fine after this. The Inertia switch is a safety switch and sometimes can trip when a door or trunklid is slammed.
If your vehicle does not start, you still could have a Bad fuelpump relay which you will find in one of the Powerboxes under the hood. There are also Ignition relays for some models, again in a Powerbox. There are scanners which you can use to diagnose the problem.
The antitheft system can interfere with starting. As a last effort you can try to punch n the Doorcode and try to start the car within seconds of entering the code.
If you hear the fuelpump operate the first 1 or 2 seconds when the key is turned to RUN position, the fuelpump is working. If you do not hear the fuelpump run, check the Inertia switch which should be in the side panel of the rear cargo area. If you have an owners manual check for the Inertia switch location.
To reset the Inertia switch, hold the button on it for 2-3 seconds. You should now hear the pump run. You may also have a fuelpump relay under the hood in one of the Powerboxes. The Powerbox may have a fusible link from the Battery. When the fusible link is OK and the Pump Relay is OK, there is a fuse in the Fuse panel. Then finally the Ignition switch will trip the Pump relay. As power flows through the wire to the fuelpump the Inertia switch can break the power connection.
So you have 5 powerpoints before the fuelpump will work. Fusible link, Pump Relay, Fuse Panel, Ignition Switch,and Inertia switch. These must all work before the fuelpump can run.